As a consequence of the recent eco-design domestic energy labelling system update (labels A-G), it is projected that the average energy consumption in the domestic refrigerator market will be reduced up to 30% by 2025 (when compared to the current market). To achieve this goal, this ENOUGH demonstrator (read more here) explores the application of the most innovative technologies and control strategies to improve the total energy consumption of a household refrigerator. Blends of R290/R600a have the potential for both quick and energy efficient cooling once the correct mixing ratio is achieved. Application of EEVs (Electronic expansion valves) offers the advantage of flexible cooling on the refrigerator operating under different ambient conditions. In addition, alternative effective PU insulations have been tested to reduce total heat gain and increase the efficiency of the refrigeration cycle.
Various prototypes were created for the use of new technologies developed in the project for refrigerators and their effects on energy consumption were examined to determine which ones should be used in the new refrigerators. The system COP has been increased by ensuring operation at high evaporation temperature in the full parallel cooling system. This system includes three technologies: new high-performance foams (insulation), new technologies VIPs (vacuum insulation panel), and new defrost strategies which were integrated on the same appliance. The new refrigerator consumes 10% less energy as targeted.
To reduce the energy consumption of the refrigerator more efficient insulation was first used. As a result of the studies, a better heat gain value was achieved in the refrigerator by using fewer vacuum insulation panels (VIP), thus reducing the heat gain values of the refrigerator. Different defrost strategies are currently under test at ARCELIK’s facilities. Preliminary results showed relevant improvements in the defrost efficiency, with a positive impact (2%) on the overall energy consumption. Although the target of having a refrigerator that consumes 10% less energy has been achieved, this target will be improved even more with new developments: integration of electronic expansion valve (EEV), and higher performance components (compressor, evaporator, condenser, fan).
Next generation household refrigeration- demonstrator set up at ARCELIK’s facilities
Next generation household refrigeration- Full Parallel Refrigeration System Cycle
