Innovative technologies and control strategies for energy-efficient improvement, sustainability, and flexible cooling in a next-generation refrigerator

Experimental setup of defrost optimisation studies.


Full-Parallel Cooling System Design.


Modelling the EEV component on the cooling cycle.


Next generation refrigerator


Arçelik, Istanbul, Turkey


Household appliance

Reduction of GHG emissions and energy consumption

Description of the DEMO: To reach a high level of sustainability and resilient cooling goals, EEV application, full parallel system design, and defrost optimisation are promising technologies.


It has been established that the energy consumption of the refrigeration system with the electronic valve could reduce by about 2 %.  These outcomes are significant in the design of high-energy-efficiency class refrigerators fitting the new version of the energy consumption regulations. 

Experiments were conducted to assess the possibility of using an isobutane-propane mixture (R600a/R290) as a drop-in substitute to isobutane (R600a) in a particular domestic freezer. Although the decrease percentage of run-time ratio was between 10.9% and 31.1% case-specific, the corresponding increments in compressor power were between 17.0% and 76.3%. Thus, it has been concluded that further studies should be carried out on enhancing the mechanical losses, isentropic losses, and systematic design variables. At the mass percentage of 90-10% (R600a- R290) the energy consumption was decreased by 2.5%. 

In addition to these issues, in order to reduce the total heat gain and increase the cycle efficiency, 4% heat gain improvement can be achieved according to alternative effective PU and VIP insulation studies. 


1) “Performance evaluation of a domestic freezer with R600a and zeotropic mixtures of R600a/R290”, 15th IIR- Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 2022. 

2) “Energy Consumption Performance Evaluation of a Household Refrigerator with Electronic Expansion Valve”, The 26th International Congress of Refrigeration (ICR2023). Proceedings. Paris, France, August 2023. 

3) “The Effect of Capillary Tube Parameters and Use of Multi-Capillary on Energy Consumption in Vapor Compression Cycle”, Cukurova 9th International Scientific Researches Conference. Adana, Turkey, October 2022 



Serdar Kocatürk :

Mutlu İpek :

Gökmen Peker :

Cem Berk Tuzcu, 

Hüseyin Cura,