INTER-KLIMA Conference 2025 - Book of Abstract
27th Internation Conference on Heating, Cooling and Air-Conditioning
Vodice, Croatia, The Imperial Park Hotel Hotel 26 - 28 March 2025
Book of Abstracts
Organized by:
Operated by:
Supported by:
Book of Abstracts
27th International Conference on Heating, Cooling and Air-conditioning
Vodice, Croatia, The Imperial Park Hotel Hotel 26 - 28 March 2025
The scientific papers from the INTER-KLIMA 2025 Conference Book of Abstracts and published at the official INTER-KLIMA Conference web site interklima.fsb.hr, were reviewed by the members of the Conference Scientific Committee. The papers are presented in their original form. Their complete or partial reproduction is permitted only under permission of the publisher.
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
Nakladnik / Publisher University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Ulica Ivana Lučića 5, 10 000 Zagreb, Croatia www.fsb.unizg.hr
Urednici / Editors prof. dr. sc. Damir Dović prof. dr. sc. Vladimir Soldo doc. dr. sc. Saša Mudrinić
Recenzije / Revisions prof. dr. sc. Ivanka Boras prof. dr. sc. Damir Dović prof. emer. Antun Galović izv. prof. dr. sc. Ankica Kovač prof. dr. sc. Dražen Lončar doc. dr. sc. Saša Mudrinić, dipl. ing. prof. dr. sc. Vladimir Soldo
Dizajn i grafičko uređenje / Layout and technical editing ENERGETIKA MARKETING d.o.o., Zagreb
ISSN 2459-9166
THE DIGITAL PROCEEDINGS SUPPLEMENTED WITH THE ALL RECEIVED PAPERS, PRESENTATIONS AND VIDEOS WILL BE AVAILABLE TO ALL PARTICIPANTS OF THE KLIMA-FORUM 2025 AND INTER-KLIMA 2025 CONFERENCE from Friday, 25 April 2025 . Each participant of the conferences will receive an e-mail with a password to access the Digital Proceedings for downloading papers, presentations and videos.
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IMPRESSUM
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
Organized by:
University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia
University of Maribor, Faculty of Energy Technology, Maribor, Slovenia
Rumeli University, Faculty of Engineering and Architecture, Istanbul, Türkiye
University of Mostar, Faculty of Mechanical Engineering, Computing and Electrical Engineering, Mostar, Bosnia and Herzegovina
Operated by:
Energetika Marketing d.o.o., Zagreb, Croatia
HESO - Croatian Professional and Scientific Association for Energy, Engineering Technologies and Renewable Energy Sources, Zagreb, Croatia
Supported by:
Environmental Protection and Energy Efficiency Fund, Zagreb, Croatia
Croatian Chamber of Mechanical Engineers Zagreb, Croatia
Croatian Refrigeration, Air Conditioning and Heat Pumps Association, Zagreb, Croatia
Croatian Heat Pump Association Zagreb, Croatia
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ORGANIZATION
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
Scientific Programme Committee Jurij Avsec
Ivanka Boras Ertan Buyruk Ahmet Can Tonko Ćurko Damir Dović Neven Duić
Nenad Ferdelji Antun Galović Andrej Kitanovski
Kristian Lenić Dražen Lončar Gordan Lješić Davor Ljubas Sandro Nižetić Vladimir Soldo - chairman
Organization Committee Jurij Avsec
Luka Boban Ahmet Can Damir Dović Petar Filipović Ivan Horvat Boris Labudović Gordan Lješić Saša Mudrinić Martina Odeljan Vladimir Soldo
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COMMITEES
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
PROGRAMME
Wednesday, 26 March 2025
8:30 - 10:00 > gathering and registration of participants > furnishing and arranging exhibition spaces of co-organizers
10:00 - 10:30 KLIMA-FORUM 2025 & INTER-KLIMA 2025 Conference > introductory word from the Organizer > welcome and introductory speeches: prof. emer. Tonko ĆURKO , Croatian Refrigeration Air-Conditioning and Heat Pumps Association, Zagreb, Croatia
10:30 - 11:30 KLIMA-FORUM 2025
1st Thematic Section: GLOBALLY and LOCALLY > presentations and one on one interviews:
Višnja GRGASOVIĆ, dipl. ing. , Ministry of Environmental Protection and Green Transition, Zagreb, Croatia - A NEW EUROPEAN AND NATIONAL LEGISLATION IN THE FIELD OF SUBSTANCES THAT DAMAGE THE OZONE LAY- ER AND FLUORINATED GREENHOUSE GASES prof. dr. sc. Marino GROZDEK , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - THE FUTURE IS NATURAL! (one on one interview) Jarosław STALEWSKI, A-Gas Nederland B.V., Eygelshoven, Netherlands - CLOSED LOOP SYSTEM FOR USED SYN- THETIC REFRIGERANTS Hrvoje KRAPANIĆ, dipl. ing. , Daikin Hrvatska d.o.o., Zagreb, Croatia - NATURAL REFRIGERANTS STRIKE BACK (one on one interview) Luka ĆAPIN, mag. ing. industr. , Samsung Electronics Adriatic, Branch Office Zagreb, Zagreb, Croatia - THE FU- TURE OF HVAC: INTEGRATION OF SMART SYSTEMS FOR MAXIMUM EFFICIENCY > discussion
11:30 - 12:00 coffee break
12:00 - 14:00 INTER-KLIMA 2025 Conference
FRAN BOŠNJAKOVIĆ DAY - 1st Part > invited lecture: prof. dr. Andrej KITANOVSKI , University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia - COOLING AND HEAT PUMP TECHNOLOGIES - OVERVIEW AND PERSPECTIVES > presentations: Siniša PRODANOVIĆ , Öko-Recherche GmbH, Frankfurt am Main, Germany, Jan GROEZINGER and Jakob HOFF- MANN , Guidehouse, Berlin, Germany, Felix HEYDEL and Maria PUSHKAREVA , Öko Recherche GmbH, Frankfurt am Main, Germany - LATEST DEVELOPMENTS IN NATIONAL COOLING STRATEGIES (NCS) AND NATIONAL COOL- ING PLANS (NCAP) IN THE MENA REGION AND TÜRKIYE doc. dr. sc. Luka BOBAN and doc. dr. sc. Saša MUDRINIĆ , University of Zagreb, Faculty of Mechanical Engineer- ing and Naval Architecture, Zagreb, Croatia, prof. dr. Andrej KITANOVSKI and doc. dr. Katja KLINAR , University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia and prof. dr. sc. Vladimir SOLDO , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - EVALUATION OF WORKING FLUIDS FOR HIGH-TEMPERATURE REVERSED BRAYTON CYCLE HEAT PUMP Urška NOVOSEL , doc. dr. Brigita FERČEC and prof. dr. Jurij AVSEC , University of Maribor, Faculty for Energy Technology, Krško, Slovenia - THE HISTORICAL AND FUTURE DEVELOPMENT OF HEAT PUMPS IN THE PROCESS OF IMPLEMENTING THE GREEN TRANSITION
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PROGRAMME
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
PROGRAMME
Wednesday, 26 March 2025
doc. dr. sc. Gordan LJEŠIĆ , University of Mostar, Faculty of Mechanical Engineering, Computing and Electrical En- gineering, Mostar, Bosnia and Herzegovina and prof. dr. sc. Vladimir SOLDO , University of Zagreb, Faculty of Me- chanical Engineering and Naval Architecture, Zagreb, Croatia - THE INFLUENCE OF INTERNAL HEAT EXCHANGER ON THE EFFICIENCY OF THE REFRIGERATION PROCESS WITH PROPANE AS A REFRIGERANT Juraj ČUKELJ, mag. ing. mech. and prof. dr. sc. Marino GROZDEK , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia, doc. dr. sc. Tomislav VELIKI , University North, Varaždin, Croatia and doc. dr. sc. Vlasta ZANKI , University of Zagreb, Faculty of Geotechnical Engineering, Varaždin, Croatia - ASSESSING THE DELIVERED ENERGY IN BUILDINGS > discussion Remark: Presentations are held solely in English.
14:00 - 14:15 coffee break
14:15 - 15:15 KLIMA-FORUM 2025
2nd Thematic Section: SYSTEMS and REGULATION > presentations: Dr.-Ing. Maciej DANIELAK , Kampmann GmbH & Co. KG, Lingen (Ems), Germany - COMFORTABLE CLIMATE: FAC- TORS, MEASUREMENTS AND DESIGN Marko PRPIĆ, mag. ing. mech. , Flexy Sustavi d.o.o., Zagreb, Croatia - LENNOX EVIO - REVOLUTIONARY ROOF- TOP UNIT OF THE NEW GENERATION Milan FISTONIĆ, dipl. ing. , PTMG d.o.o., Gornji Stupnik, Croatia - PE-HD PREINSULATED PIPING SYSTEMS FOR TRANSPORT OF COOLING MEDIA Tomislav ĆUTIĆ, mag. ing. mech. , Wolf GmbH, Mainburg, Germany and Aleksandar JOVANOSKI, Pro-klima d.o.o., Samobor, Croatia - RETROFIT OF VENTILATION UNITS (AIR CONDITIONING UNITS) - INCREASING ENERGY EFFI- CIENCY IN CENTRAL AIR CONDITIONING PROCESSES > discussion
15:15 lunch
19:30 - 20:30 dinner
20:30 social programme > Pub Quiz > DJ by &
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PROGRAMME
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
PROGRAMME
Thursday, 27 March 2025
09:00 - 11:00 INTER-KLIMA 2025 Conference
FRAN BOŠNJAKOVIĆ DAY - 2nd Part > presentations:
Prof. Dr. Ahmet CAN , Istanbul Rumeli University, Faculty of Engineering and Natural Sciences, Istanbul, Türkiye, Prof. Dr. Ertan BUYRUK , Sivas State University, Mechanical Engineering Department, Sivas, Türkiye, Dr. Emre TO- RUN , Sivas Demirağ Organized Industrial Zone Directorate, Sivas, Türkiye and Assist. Prof. Dr. Mustafa CANER , Sivas State University, Mechanical Engineering Department, Sivas, Türkiye - USE OF PHASE CHANGE MATERIALS IN BUILDINGS Vasilis CHRISTODOULIDES , Dr.-Ing. Paris A. FOKAIDES and Nicholas AFXENTIOU , Frederick University, Nicosia, Cyprus - UTILIZING DIGITAL TWIN TECHNOLOGY FOR IMPROVED PREDICTIVE MODELLING OF ENERGY CON- SUMPTION IN SMART BUILDINGS dr. sc. Marko MIMICA , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - ENERGY SYSTEM MODELLING FOR GREEN DEVELOPMENT OF AFRICA L uka SIMIĆ, mag. ing. mech. , izv. prof. dr. sc. Tomislav PUKŠEC , Josip MIŠKIĆ, mag. ing. mech. , Vid AN- DRAŠIĆ and Lovro PUČEK , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - ANALYSIS OF IMPACT OF BUILDING REFURBISHMENT STRATEGIES ON THE TRANSITION TO LOW-TEMPERATURE DISTRICT HEATING Goran STUNJEK, mag. ing. mech. , Roko MUCIĆ , Andrija GLAVAŠ and Mario MIHETEC, dipl. ing. , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia, Dominik RAŠIĆ, mag. ing. mech. , Cirkularni energetski resursi d.o.o., Zagreb, Croatia, Andrej MAJDIŠ, dipl. ing. and Mario MARJANOVIĆ , dipl. ing. , HEP Toplinarstvo d.o.o., Zagreb, Croatia, Gordana MIKULČIĆ KRNJAJA , City of Velika Gorica, Velika Gorica, Croatia, dr. sc. Marko MIMICA , dr. sc. Nikola MATAK , dr. sc. Stanislav BOLDYRYEV and izv. prof. dr. sc. Goran KRAJAČIĆ , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - OPTIMIZING HEAT PUMP INTEGRATION FOR THE DECARBONIZATION OF DISTRICT HEATING IN VELIKA GORICA - META BUILD Juraj KUZLE, mag. ing. mech. , prof. dr. sc. Damir DOVIĆ and dr. sc. Ivan HORVAT , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - COST-OPTIMAL ANALYSIS OF THE REFER- ENCE MULTI-APARTMENT nZEB/ZEB BUILDING IN CROATIA > discussion Remark: Presentations are held solely in English.
11:00 - 11:30 coffee break
11:30 - 13:00 KLIMA-FORUM 2025
3rd Thematic Section: PROJECTS and SOLUTIONS > presentations:
prof. dr. sc. Vladimir SOLDO , Katarina ŽUNIĆ and doc. dr. sc. Luka BOBAN , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - LABORATORY SET-UP AT THE FACULTY OF MECHANICAL ENGINEERING AND NAVAL ARCHITECTURE OF THE UNIVERSITY OF ZAGREB FOR HEAT PUMPS TESTING IN REAL SURROUNDINGS Klaus ACHENBACH , Condair GmbH, Garching, Germany - RELEVANCE OF ADIABATIC HUMIDIFICATION SYS- TEMS IN TODAY’S BUILDING TECHNOLOGY
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PROGRAMME
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
PROGRAMME
Thursday, 27 March 2025
Dimitrije LEVAČIĆ, bacc. ing. mech. , Carrier Kaltetechnik Austria GmbH, Zagreb Main Branch Office, Zagreb, Cro- atia - NATURAL REFRIGERANT R 744 (CO 2 ) AND ITS APPLICATIONS IN INDUSTRIAL COOLING AND HEAT PUMPS Stjepan MIKLEUŠEVIĆ , Viessmann d.o.o., Zagreb, Croatia - VIESSMANN CLIMATE SOLUTIONS - POWER PLAY AS ONE TEAM Samo ŠMID, univ. dipl. inž. str. , BELIMO AG, Technical Office, Kranj, Slovenia - BELIMO ZoneEaseTM - A SYSTEM FOR A SIMPLE ZONE INTEGRATION Vedran VUKASOVIĆ , Atrea d.o.o., Rijeka, Croatia - KITCHEN VENTILATION CEILING ATREA TPV - PERFECT FUNC- TIONALITY WITH ATTRACTIVE DESIGN > discussion
13:00 - 13:15 coffee break
13:15 - 15:15 INTER-KLIMA 2025 Conference
ENERGY EFFICIENCY AND RENEWABLES - 1st Part > presentations:
Ana Daria BOKAN , dr. sc. Marko MIMICA and izv. prof. dr. sc. Goran KRAJAČIĆ , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - INSTITUTIONAL TRANSFORMATION IN HIGHER EDUCATION: ADVANCING R&I EXCELLENCE FOR THE GREEN AND DIGITAL TRANSITION dr. sc. Dušan STRUŠNIK , Energetika Ljubljana d.o.o., TE-TOL Unit, Ljubljana, Slovenia and prof. dr. Jurij AVSEC , University of Maribor, Faculty for Energy Technology, Krško, Slovenia - MEASUREMENT OF DEVIATIONS IN THE CHARACTERISTIC POINTS OF THE TURBINE CONDENSATE PUMP AFTER TEN YEARS OPERATION Danijel ZADRAVEC, mag. ing. mech. and izv. prof. dr. sc. Nenad FERDELJI University of Zagreb, Faculty of Me- chanical Engineering and Naval Architecture, Zagreb, Croatia - EXERGY ANALYSIS OF BATCH DISTILLATION PROCESS Nikola BOROVNIK, mag. ing. mech. , doc. dr. sc. Saša MUDRINIĆ and izv. prof. dr. sc. Nenad FERDELJI , Univer- sity of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - MULTISCALE MODEL- LING OF HEAT TRANSFER INSIDE THE VACUUM CHAMBER FOR TRANSFORMER DRYING PROCESS dr. sc. Alen CUKROV, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia, Dr. Yohei SATO , Paul Scherrer Institute, Laboratory for Simulation and Modelling, PSI Center for Scientific Computing, Theory and Data, Villigen, Switzerland, prof. dr. sc. Ivanka BORAS , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia, Dr. Bojan NIČENO , Paul Scherrer Institute, Lab- oratory for Simulation and Modelling, PSI Center for Scientific Computing, Theory and Data, Villigen, Switzerland and prof. emer. Antun GALOVIĆ , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - THE APPLICABILITY OF THE QUASI-STEADY SOLUTION TO STEFAN PROBLEM IN DETERMINA- TION OF INTERFACE POSITION FOR VARIOUS WALL SUPERHEATS Andre BILOGLAV , Marko RILJIN, univ. bacc. ing. mech. , Iva SLATINA, mag. ing. mech . and prof. dr. sc. Vladimir SOLDO , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - POTENTIAL OF SEWAGE WATER HEAT PUMPS IN A SUSTAINABLE DISTRICT HEATING SYSTEM > discussion Remark: Presentations are held solely in English.
15:15 lunch
19:30 - 20:30 dinner
20:30 social programme > Karaoke Show > DJ
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PROGRAMME
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
PROGRAMME
Friday, 28 March 2025
9:00 - 10:30 KLIMA-FORUM 2025
4th Thematic Section: EFFICIENCY and COMFORT > presentations: Toni LACIĆ, mag. ing. mech. , Rittal d.o.o., Zagreb, Croatia - CHALLENGES IN IT COOLING - DEVELOPMENT AND INVESTMENTS Luka CERAJ, mag. ing. mech. , Flexy Sustavi d.o.o., Zagreb, Croatia - SODECA - STAIRWAY PRESSURIZATION SYS- TEMS ACCORDING TO EN 12 101-13 prof. dr. sc. Zlatko JANKOSKI , University of Split, University Department for Professional Studies, Department of Mechanical Engineering, Split, Croatia - AIR AS A ENERGY CARRIER - SYSTEMS IN EDUCATION FUNCTION prof. dr. sc. Antonio PETOŠIĆ , doc. dr. sc. Mia SUHANEK , Zvonko LELAS and Andrija PERŠUN , University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia - PRACTICAL CONSIDERATIONS FOR MODELLING NOISE LEVELS FROM HVAC SYSTEMS > discussion
10:30 - 11:00 coffee break
11:00 - 13:00 INTER-KLIMA 2025 Conference
ENERGY EFFICIENCY AND RENEWABLES - 2nd Part > presentations:
Maša MILANOVIĆ-LITRE, mag. ing. mech. , izv. prof. dr. sc. Marko KATIĆ , dr. sc. Martina ODELJAN and prof. emer. Antun GALOVIĆ , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - DETERMINATION OF TEMPERATURE INDUCED X-RAY SOURCE SHIFTS IN A CT SCANNER prof. dr. sc. Antonio PETOŠIĆ , doc. dr. sc. Mia SUHANEK , Andrija PERŠUN and Zvonko LELAS , University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia - PRACTICAL CONSIDERATIONS FOR MODELLING NOISE LEVELS FROM HVAC SYSTEMS doc. dr. sc. Saša MUDRINIĆ , Nikola BOROVNIK, mag. ing. mech. and doc. dr. sc. Luka BOBAN , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - ENERGY AND EXERGY ANAL- YSIS OF A DIRECT-EXPANSION SOLAR-ASSISTED HEAT PUMP SYSTEM Stjepan HERCEG, mag. ing. mech. , izv. prof. dr. sc. Nikola VLADIMIR and prof. dr. sc. Vladimir SOLDO , Uni- versity of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - THE USE OF WASTE HEAT FOR COOLING PURPOSES ONBOARD SHIPS dr. sc. Ivan HORVAT , prof. dr. sc. Damir DOVIĆ and Petar FILIPOVIĆ, mag. ing. mech. , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - ENHANCING THERMAL IMAGING INTERPRETATION: AN INTERACTIVE TOOL FOR UNDERSTANDING APPARENT AND ACTUAL TEMPERATURE Petar FILIPOVIĆ, mag. ing. mech. , prof. dr. sc. Damir DOVIĆ and dr. sc. Ivan HORVAT , University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia - EVALUATION OF THERMAL CHARAC- TERISTICS OF AIR HANDLING UNIT MODEL BOX > discussion Remark: Presentations are held solely in English.
13:00 a final word from the Organizer
13:15 lunch
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PROGRAMME
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
CONTENT
Impressum.............................................................................................................................................................................................................4
Organization.........................................................................................................................................................................................................5
Committees. .........................................................................................................................................................................................................6
Programme...........................................................................................................................................................................................................7
Content................................................................................................................................................................................................................ 12
UNIVERSITY OF ZAGREB, FACULTY OF MECHANICAL ENGINEERING AND NAVAL ARCHITECTURE, Zagreb.....................................................................................................................14
prof. dr. Andrej KITANOVSKI COOLING AND HEAT PUMP TECHNOLOGIES - OVERVIEW AND PERSPECTIVES........................................................................15
Siniša PRODANOVIĆ et. al. LATEST DEVELOPMENTS IN NATIONAL COOLING STRATEGIES (NCS) AND NATIONAL COOLING PLANS (NCAP) IN THE MENA REGION AND TÜRKIYE.......................................................................................................16
doc. dr. sc. Luka BOBAN et. al. EVALUATION OF WORKING FLUIDS FOR HIGH-TEMPERATURE REVERSED BRAYTON CYCLE HEAT PUMP.......................17
Urška NOVOSEL, et. al. THE HISTORICAL AND FUTURE DEVELOPMENT OF HEAT PUMPS IN THE PROCESS OF IMPLEMENTING THE GREEN TRANSITION...............................................................................................................................................18 doc. dr. sc. Gordan LJEŠIĆ et. al. THE INFLUENCE OF INTERNAL HEAT EXCHANGER ON THE EFFICIENCY OF THE REFRIGERATION PROCESS WITH PROPANE AS A REFRIGERANT.......................................................................................................................................19
Juraj ČUKELJ mag. ing. mech. ASSESSING THE DELIVERED ENERGY IN BUILDINGS............................................................................................................................20
Prof. Dr. Ahmet CAN et. al. USE OF PHASE CHANGE MATERIALS IN BUILDINGS............................................................................................................................21
Vasilis CHRISTODOULIDES et. al. UTILIZING DIGITAL TWIN TECHNOLOGY FOR IMPROVED PREDICTIVE MODELLING OF ENERGY CONSUMPTION IN SMART BUILDINGS.....................................................................................................................................................22
dr. sc. Marko MIMICA ENERGY SYSTEM MODELLING FOR GREEN DEVELOPMENT OF AFRICA.......................................................................................23
Luka SIMIĆ, mag. ing. mech. et. al. ANALYSIS OF IMPACT OF BUILDING REFURBISHMENT STRATEGIES ON THE TRANSITION TO LOW-TEMPERATURE DISTRICT HEATING...........................................................................................................................................24
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CONTENT
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
CONTENT
Goran STUNJEK, mag. ing. mech. et. al. OPTIMIZING HEAT PUMP INTEGRATION FOR THE DECARBONIZATION OF DISTRICT HEATING IN VELIKA GORICA - META BUILD.....................................................................................................................................................................25 Juraj KUZLE, mag. ing. mech. et. al. COST-OPTIMAL ANALYSIS OF THE REFERENCE MULTI-APARTMENT nZEB/ZEB BUILDING IN CROATIA............................26 Ana Daria BOKAN et. al. INSTITUTIONAL TRANSFORMATION IN HIGHER EDUCATION: ADVANCING R&I EXCELLENCE FOR THE GREEN AND DIGITAL TRANSITION...........................................................................................................................................27 dr. sc. Dušan STRUŠNIK et. al. MEASUREMENT OF DEVIATIONS IN THE CHARACTERISTIC POINTS OF THE TURBINE CONDENSATE PUMP AFTER TEN YEARS OPERATION.......................................................................................................................................................28 Danijel ZADRAVEC, mag. ing. mech. et. al. EXERGY ANALYSIS OF BATCH DISTILLATION PROCESS.......................................................................................................................29 Nikola BOROVNIK, mag. ing. mech. et. al. MULTISCALE MODELLING OF HEAT TRANSFER INSIDE THE VACUUM CHAMBER FOR TRANSFORMER DRYING PROCESS.............................................................................................................................................................30 dr. sc. Alen CUKROV et. al. THE APPLICABILITY OF THE QUASI-STEADY SOLUTION TO STEFAN PROBLEM IN DETERMINATION OF INTERFACE POSITION FOR VARIOUS WALL SUPERHEATS............................................................................................................31 Andre BILOGLAV et. al. POTENTIAL OF SEWAGE WATER HEAT PUMPS IN A SUSTAINABLE DISTRICT HEATING SYSTEM..........................................32 Maša MILANOVIĆ-LITRE et. al. DETERMINATION OF TEMPERATURE INDUCED X-RAY SOURCE SHIFTS IN A CT SCANNER...................................................33 prof. dr. sc. Antonio PETOŠIĆ et. al. PRACTICAL CONSIDERATIONS FOR MODELLING NOISE LEVELS FROM HVAC SYSTEMS.......................................................34 doc. dr. sc. Saša MUDRINIĆ et. al. ENERGY AND EXERGY ANALYSIS OF A DIRECT-EXPANSION SOLAR-ASSISTED HEAT PUMP SYSTEM................................35 Stjepan HERCEG et. al. THE USE OF WASTE HEAT FOR COOLING PURPOSES ONBOARD SHIPS........................................................................................36 dr. sc. Ivan HORVAT et. al. ENHANCING THERMAL IMAGING INTERPRETATION: AN INTERACTIVE TOOL FOR UNDERSTANDING APPARENT AND ACTUAL TEMPERATURE............................................................................................................37 Petar FILIPOVIĆ, mag. ing. mech. et. al. EVALUATION OF THERMAL CHARACTERISTICS OF AIR HANDLING UNIT MODEL BOX...........................................................38
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CONTENT
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
prof. dr. Andrej KITANOVSKI University of Ljubljana Faculty of Mechanical Engineering Aškerčeva cesta 6 SI-1000 Ljubljana Slovenia e-mail: andrej.kitanovski@fs.uni-lj.si
He is a professor and the head of a Department for Thermal and Environmental Engineering at the Faculty of Me- chanical Engineering of the University of Ljubljana (Slovenia). His scientific research activities and most important global contribution involves the research and development of solid-state thermal management technologies as- sociated with the cooling, heat pumps, energy harvesting. In 2004, he co-founded the International Institute of Re- frigeration (IIR) International Magnetic Cooling Working Party, which created the well-known IIR Thermag Confer- ences, and which today covers topics of research and development of all caloric technologies. Today, he chairs the Working Group on Solid-State Cooling and Heating under the International Institute of Refrigeration. Since 2010, he has been actively involved in research on new and advanced principles of thermal management using thermal control devices (thermal diodes, thermal switches, thermal conduits) and thermal circuits. He is also involved in several different applied and industrial research activities which concern: Predictive control of energy devices, Heat pumps, Solar heating and PVT, Thermal Storage, Waste heat management, Household Appliances, and Thermal Storage. COOLING AND HEAT PUMP TECHNOLOGIES - OVERVIEW AND PERSPECTIVES (Invited Lecture)
Heating and cooling account for nearly 50% of global end-use energy consumption. Industrial processes and residential/commercial buildings each contribute approximately half of this to- tal. These ubiquitous applications are significant sources of air pollution and responsible for over 40% of global energy-related CO 2 emissions. Fur- thermore, demand for refrigeration and air con- ditioning, currently consuming roughly 17% of global electricity, is projected to triple by 2050, with substantial growth also anticipated for heat pumps. Compounding the issue, vast quantities of waste heat are continuously released into the
environment; it is estimated that waste heat will account for nearly 50% of annual global energy consumption by 2030. Consequently, energy-ef- ficient cooling and heat pump technologies, utiliz- ing environmentally friendly refrigerants, repre- sent a crucial target for achieving a global green transition, potentially exceeding the contributions of sectors like transport or power generation. This presentation will provide an overview of both market-available and emerging cooling and heat pump technologies, encompassing a broad range of temperatures and applications. It will also offer perspectives on future developments in the field.
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1st Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
Siniša PRODANOVIĆ Öko Recherche GmbH Münchener Straße 23a D-60329 Frankfurt am Main Germany e-mail: sinisa.prodanovic@oekorecherche.de
He received a bachelor’s degree in international relations and affairs from the Faculty of Political Science of the Uni- versity of Belgrade (Serbia). He also received a master’s degree in politics and public administration from the Uni- versity of Constance (Germany). He began his career as an intern at the Belgrade Centre for Security Policy, where he worked in the period 2020 - 2021. Then, in the period 2022 - 2024 he was a teaching and research assistant at the University of Constance. Today he is a consultant for climate and environmental policy at Öko Recherche, a German company specialized for environmental research and consulting.
Felix HEYDEL Öko Recherche GmbH, Frankfurt am Main, Germany Maria PUSHKAREVA Öko Recherche GmbH, Frankfurt am Main, Germany
Jan GROEZINGER Guidehouse, Berlin, Germany Jakob HOFFMANN Guidehouse, Berlin, Germany
LATEST DEVELOPMENTS IN NATIONAL COOLING STRATEGIES (NCS) AND NATIONAL COOLING PLANS (NCAP) IN THE MENA REGION AND TÜRKIYE
This paper explores the latest policy developments to advance sustainable cooling in the MENA re- gion and Türkiye as supported by the Cool Up programme which is funded by the German Inter- national Climate Initiative. The focus is put on the development of the National Cooling Strategies (NCS) and National Cooling Action Plans (NCAP) to address cooling needs in a holistic manner. Methodological aspects including data collection and analysis as well as stakeholder engagement are highlighted. Key aspects of modeling and re- sults are presented, supported by visual represen-
tations such as graphs, to illustrate different sce- narios of projected emissions. The analysis leads to the identification of different strategic interven- tion areas and relevant policy measures essential for promoting energy efficiency and uptake of the natural refrigerants. The NCAP policy measures also aim to support policymakers and stakehold- ers in strengthening the implementation; and cre- ating a framework for monitoring and evaluation of further actions taking place within the project- ed timeline. These plans play a critical role in en- suring sustainable cooling solutions in the region.
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1st Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
doc. dr. sc. Luka BOBAN University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Ulica Ivana Lučića 5 10 000 Zagreb Croatia e-mail: luka.boban@fsb.unizg.hr
He was born on 18 April 1989 in Split. He graduated from undergraduate and graduate studies in mechanical en- gineering at the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb (FSB). He received his PhD in 2019, also at FSB, in the field of experimental and theoretical research of geothermal heat pumps. During his studies, he actively participated in the work of the Student Association for the Promotion of Ener- gy Efficiency and Consulting (SUPEUS) and the UNIZG University Team at the 'Solar Decathlon Europe' competition in 2014, and was also an external associate of the EGE magazine. After completing his studies, he first worked as an assistant manager on the project 'Research and Promotion of Shallow Geothermal Potentials in Croatia (Geo- Mapping)' financed by the Structural Funds. Since 2014, he has been working at the FSB's Department of Ther- modynamics, Thermal and Process Engineering, where he is currently an assistant professor and participates in teaching courses related to refrigeration processes and heat pumps, theoretical thermodynamics and mechanical operations, and his research interests include the field of refrigeration processes, heat pumps and natural working fluids. He has been an active member of the Technical Committee HZN/TO 86 'Refrigeration, air conditioning and heat pumps' at the Croatian Standards Institute since 2016 and the secretary of the Croatian Heat Pump Associ- ation (HUDiT) since 2019. He has published several papers in scientific journals and conference proceedings and participated in the preparation of several professional studies.
doc. dr. Katja KLINAR University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia prof. dr. sc. Vladimir SOLDO University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia
dr. sc. Saša MUDRINIĆ University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia prof. dr. Andrej KITANOVSKI University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
EVALUATION OF WORKING FLUIDS FOR HIGH- TEMPERATURE REVERSED BRAYTON CYCLE HEAT PUMP
Decarbonizing energy-intensive industries is crucial for achieving a sustainable, carbon-neutral future, as industrial heat production significantly contrib- utes to global greenhouse gas emissions. One po- tential solution is upgrading available waste heat using heat pumps to meet industry demand at appropriate temperature levels. Currently avail- able industrial-scale high-temperature heat pump technologies, such as vapor compression and open-cycle mechanical vapor recompression, op- erate within a temperature range of 100 to 300 °C,
leaving a significant portion of process heating out- side their operating range. A promising solution for high-temperature demand is the gas-cycle heat pump based on the reversed Brayton cycle. How- ever, the choice of working fluid for such a cycle re- mains an open question and depends on process requirements as well as various environmental and thermophysical properties. Therefore, this re- search focuses on the criteria for selecting working fluids for high-temperature reversed Brayton cycle heat pumps in industrial applications.
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1st Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
Urška NOVOSEL University of Maribor Faculty for Energy Technology Hočevarjev trg 1 SI-8270 Krško Slovenia e-mail: urska.novosel@um.si
She graduated from the Faculty for Energy Technology of the University of Maribor (Slovenija). Today she is a teaching and research assistant at the Faculty for Energy Technology.
doc. dr. Brigita FERČEC University of Maribor, Faculty for Energy Technology, Krško, Slovenia prof. dr. Jurij AVSEC University of Maribor, Faculty for Energy Technology, Krško, Slovenia
THE HISTORICAL AND FUTURE DEVELOPMENT OF HEAT PUMPS IN THE PROCESS OF IMPLEMENTING THE GREEN TRANSITION
Heat pumps represent one of the most promis- ing solutions for efficient heating and cooling in modern energy systems and their distribution. The article will show the historical development of low-temperature and high-temperature heat pumps throughout history. At present, the most widespread are compressor low-temperature heat pumps, which operate on the principle of compression and expansion of the refrigerant. They are popular due to their high efficiency, reli- ability and the possibility of use in various applica- tions, from residential buildings to industrial pro- cesses. In addition, absorption and adsorption heat pumps are also available, which use heat as an energy source for cooling or heating, which makes them suitable for use in combination with renew- able sources, such as solar or geothermal energy. Acoustic and chemical heat pumps are also being developed in laboratories. At present, heat pumps
are already widely used in various sectors, espe- cially in residential and industrial buildings, where they enable high energy efficiency and reduction of greenhouse gas emissions. With the further de- velopment of technologies and the increased fo- cus on sustainable development, heat pumps are expected to play a key role in the transition to re- newable energy sources in the future. The devel- opment of advanced materials, smart grids and more integrated systems, together with the pro- motion of policies that support the energy tran- sition, will enable the wider use of heat pumps and increase their accessibility. In addition, new applications of heat pumps are expected, such as integration with advanced energy storage sys- tems and cooling technologies, which will further increase their efficiency and applicability in the future. This article will present our view on the fur- ther development of heat pumps.
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1st Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
doc. dr. sc. Gordan LJEŠIĆ University of Mostar Faculty of Mechanical Engineering, Computing and Electrical Enginering Matice hrvatske bb 88 000 Mostar Bosnia and Herzegovina e-mail: gordan.ljesic@fsre.sum.ba
ABSTRACT
He received his PhD degree in 2022 from the Faculty of Mechanical Engineering, Computing and Electrical Engi- neering of the University of Mostar (FSRE). Today, he is an assistant professor at the FSRE.
prof. dr. sc. Vladimir SOLDO University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia
THE INFLUENCE OF INTERNAL HEAT EXCHANGER ON THE EFFICIENCY OF THE REFRIGERATION PROCESS WITH PROPANE AS A REFRIGERANT
n this paper energy performance analysis of re- frigeration process with propane (R290) as a natural refrigerant is presented. The paper deter- mines the influence of internal heat exchanger on the system efficiency. Experimental rig is a compression refrigeration cycle consisting of scroll compressor, electronic expansion valve and helically coiled tube-in-tube condenser and evaporator. The cycle is equipped with auxiliary components, oil separator, receiv- er and internal heat exchanger that can be by-
passed in order to determine individual impact on the system. Experimental rig is also equipped with advanced monitoring and acquisition sys- tem which enables determination of main system parameters, energy flow and system efficiency. Energy efficiency ratio (EER) values are deter- mined at different condensing temperatures 30 °C, 35 °C, 40 °C and 45 °C, and different cooling capacity values in the range of 6 to 11 kW. The measuring results show a negligible impact of the internal heat exchanger on the system efficiency.
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1st Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
Juraj ČUKELJ, mag. ing. mech. University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Ulica Ivana Lučića 5 10 000 Zagreb Croatia e-mail: juraj.cukelj@fsb.unizg.hr
He was born in 1996 in Zagreb. He graduated with honors in 2021 from the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb (FSB), in the Process and Energy Course with the topic 'Cooling Sys- tem of the Rubin Observatory'. Since the beginning of 2022, he has been an assistant at the FSB's Department of Thermal and Process Engineering. His areas of interest include refrigeration technology and heat pumps.
ASSESSING THE DELIVERED ENERGY IN BUILDINGS computational efficiency. The study emphasizes the importance of selecting appropriate methods based on specific requirements, ensuring robust energy assessments and informed decision-mak- ing. prof. dr. sc. Marino GROZDEK University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia doc. dr. sc. Tomislav VELIKI University North, Varaždin, Croatia doc. dr. sc. Vlasta ZANKI University of Zagreb, Faculty of Geotechnical Engineering, Varaždin, Croatia
Accurately assessing delivered energy is essen- tial for optimizing energy efficiency and ensur- ing reliable performance across various applica- tions. This study evaluates different modeling ap- proaches used for energy assessment, analyzing their predictive capabilities and potential benefits. By comparing measured data with model out- puts, the research highlights key factors influenc- ing energy consumption and identifies ways to improve estimation accuracy. Each modeling approach offers unique advan- tages, balancing complexity, transparency, and
The findings contribute to the ongoing develop- ment of reliable energy assessment methodol- ogies, supporting efforts to enhance efficiency, optimize resource utilization, and improve overall system performance.
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1st Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
Prof. Dr.-Ing. Ahmet CAN Istanbul Rumeli University Faculty of Engineering and Natural Sciences Yeni Mah. Mehmet Silivrili Cad. 38 34570 Istanbul Türkiye e-mail: ahmetcan1952@gmail.com
He graduated in mechanical engineering in 1974 from Yildiz Technical University in Istanbul (Turkey), and in 1981 from the Technical University of Berlin (Germany), where he also received his PhD degree in 1984. In the period 1977 - 1978, he was a research assistant at the Technical and Civil Engineering Academy in Balıkesir (Turkey), and in 1985 - 2012 he worked at the University of Trakya, where he was first an assistant professor and then a professor, while in 2012 - 2014 he was a professor at the Turkish-German University. Since 2018, he has been working at the Faculty of Technical and Natural Sciences of the Istanbul Rumeli University in Istanbul (Turkey), where he is current- ly a full professor, head of the Department of Industrial Engineering and vice-dean of the Faculty. He is the author and co-author of a number of scientific and professional papers at conferences and in journals.
Prof. Dr. Ertan BUYRUK Sivas State University, Mechanical Engineering Department, Sivas, Türkiye Dr. Emre TORUN Sivas Demirağ Organized Industrial Zone Directorate, Sivas, Türkiye Assist. Prof. Dr. Mustafa CANER Sivas State University, Mechanical Engineering Department, Sivas, Türkiye
Today, most of the global energy consumption, mostly fossil fuels, is used for heating and cooling buildings. The fact that fossil fuel reserves have started to decrease all over the world in recent years has revealed the necessity of finding dif- ferent energy sources such as renewable energy sources by reducing the use of fossil fuels, which is one of the goals of the Paris Agreement, and the necessity of using existing energy sources more USE OF PHASE CHANGE MATERIALS IN BUILDINGS effectively and efficiently, as well as the neces- sity of finding different storage solutions for the later use of produced but unused energy. The use of phase change materials, one of these solutions, stands out as one of the most effective methods in thermal storage. In this study, studies on the use of phase change materials in buildings are exam- ined and the advantages and disadvantages of using phase change materials are stated.
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2nd Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
Vasilis CHRISTODOULIDES Frederick University Y. Frederickou 7, Pallouriotisa Nicosia 1036 Cyprus e-mail: st025542@stud.frederick.ac.cy
He is a student in mechanical engineering at the Frederick University in Nicosia (Cyprus).
Dr.-Ing. Paris A. FOKAIDES Frederick University, Nicosia, Cyprus Nicholas AFXENTIOU Frederick University, Nicosia, Cyprus
UTILIZING DIGITAL TWIN TECHNOLOGY FOR IMPROVED PREDICTIVE MODELLING OF ENERGY CONSUMPTION IN SMART BUILDINGS
The building sector is responsible for approxi- mately 30 - 34% of global energy consumption, highlighting its pivotal role in sustainability and energy efficiency. Digital Twin (DT) technology has emerged as a game-changer in smart build- ing applications, offering real-time monitoring, analysis, and optimization capabilities. A Digital Twin is a dynamic virtual model of a physical system, integrating sensor data, Building Information Models (BIM), and Internet of Things (IoT) technologies to simulate energy usage pat- terns. This enables the identification of inefficien- cies, optimization of energy consumption, and forecasting of future energy needs based on en- vironmental conditions, occupancy patterns, and equipment performance. This study develops a predictive energy consump- tion model utilizing DT technology for Frederick University's campus buildings. Energy data from 2021 to 2024, collected via smart meters and sensor networks, was analyzed using advanced predictive algorithms - XGBoost, SARIMAX, and
Prophet. Extensive feature engineering tech- niques, including time-based pattern recognition, rolling averages, and data normalization, were implemented to enhance model accuracy. The dataset was divided into training, validation, and testing subsets to ensure robust performance evaluation. A comprehensive literature review explores the opportunities and challenges of DT integration in building energy management. Key barriers in- clude interoperability constraints, cybersecurity concerns, and the seamless incorporation of re- newable energy systems. Despite these challeng- es, the potential of DTs to transform energy man- agement through real-time insights and predic- tive analytics is substantial. The findings of this research offer practical in- sights into optimizing energy consumption and advancing the deployment of DT technology in smart buildings, contributing to a more sustain- able and intelligent built environment.
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2nd Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
dr. sc. Marko MIMICA University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Ulica Ivana Lučića 5 10 000 Zagreb Croatia e-mail: marko.mimica@fsb.unizg.hr
He graduated in 2015 from the undergraduate and 2017 from the graduate studies in electrical engineering at the Faculty of Electrical Engineering and Computing of the University of Zagreb (FER). He received his PhD degree in 2022 from the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb (FSB), in the field of energy management. In the period 2015 - 2016, he was an expert in electrical systems at Končar, and in 2017 - 2018, he was a project manager at Siemens. Since 2018, he has been working at FSB, where he is currently a senior project assistant at the Chair of Power Plants and Energy Engineering of the Department of Power Plants, Energy Engineering and Environment.
ENERGY SYSTEM MODELLING FOR GREEN DEVELOPMENT OF AFRICA
The EMERGE project seeks to provide African poli- cy makers, academics, investors, and citizens with the tools and knowledge required to increase the production of clean energy and the sustainable use of resources while bridging cultural and socio- economic divides. In order to simulate scenarios that optimize the use of current resources while taking into account social, climatic, economic, and technical constraints, EMERGE will co-design and test a Toolbox by integrating and building upon existing tools, methodologies, and approaches.
Additionally, a Knowledge Base with a collection of initiatives, materials, and knowledge-exchange activities will be created. The North Western Afri- ca (Morocco), Niger river region (Mali/Nigeria), and Mozambique are three African ecosystems where EMERGE will develop knowledge communities through a participatory approach. All of this will serve as a baseline for accelerated penetration of renewable technologies in electricty, heating, transport and agriculture sectors in Africa.
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2nd Thematic Section - FRAN BOŠNJAKOVIĆ DAY
Vodice The Imperial Park Hotel 26 - 28 March 2025
27 th International Conference on Heating, Cooling and Air-conditioning
ABSTRACT
Luka SIMIĆ, mag. ing. mech. University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Ulica Ivana Lučića 5 10 000 Zagreb Croatia e-mail: luka.simic@fsb.unizg.hr
He graduated in 2022 from the undergraduate and 2023 from the graduate studies in mechanical engineering at the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb (FSB). Since 2024, he has been working at the FSB's Chair of Power Plants and Energy Engineering of the Department for Power Plants, En- ergy Engineering and Environment, where he is a junior researcher on the project 'Fostering Ambitious and Effective NECPs in Central and Eastern Europe – Effective NECP'.
izv. prof. dr. sc. Tomislav PUKŠEC University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia
ANALYSIS OF IMPACT OF BUILDING REFURBISHMENT STRATEGIES ON THE TRANSITION TO LOW-TEMPERATURE DISTRICT HEATING
The decarbonization of the building sector is cru- cial for achieving climate neutrality, and district heating systems have shown a key role in this transition. The shift towards 4th generation dis- trict heating (4GDH) requires not only supply-side adjustments but also significant demand-side ad- aptations to ensure efficiency and sustainability. This study examines the impact of different build- ing renovation strategies and changes in heating demand on the adaptation of district heating substations, focusing on their compatibility with
new operating conditions. A simulation-based approach is used to analyse different adaptation strategies, evaluating their technical and eco- nomic feasibility under varying renovation sce- narios. The analysis provides insights into renova- tion measures and economically viable solutions for determining the right timing of transition from high-temperature to low-temperature operating regimes in district heating networks while ensur- ing system reliability and cost-effectiveness.
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2nd Thematic Section - FRAN BOŠNJAKOVIĆ DAY
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