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Theoretical analysis of the power and annual energy demands of a supermarket with a CO2 refrigeration cycle.
Number: 1104
Author(s) : THANASOULAS S., ARIAS J., SAWALHA S.
Summary
This paper investigates the theoretical energy outlook of a supermarkets in Stockholm, as well as the energy efficiency of its refrigeration unit. The refrigeration unit is a CO2 trans-critical booster system with air conditioning and geothermal storage integration into the medium temperature level. This stage is operated under overfeed conditions (zero internal superheating) thanks to liquid ejectors. On the other hand, the freezers operate under direct expansion with an optimum superheat. The supermarket is heated up by reclaimed heat from the refrigeration unit. Two heat exchangers are integrated after the high-stage compressors where water is heated for tap water and space heating.
The simulation is done for a supermarket in the design stage as part of a study that will continue by collecting data from the supermarket when is in operation to evaluate its performance and compare to the results from the design phase. The cooling demand of the medium temperature level is estimated between 100-140 kW depended on the ambient conditions and around 40 kW for the freezers. The COP in the medium temperature level is expected to be up to 7.8 and 2.5 for the low temperature level. The space heating COP is expected to be up to 7.3.
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Theoretical analysis of the power and annual energy demands of a supermarket with a CO2 refrigeration cycle
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Details
- Original title: Theoretical analysis of the power and annual energy demands of a supermarket with a CO2 refrigeration cycle.
- Record ID : 30027973
- Languages: English
- Subject: Technology
- Source: 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
- Publication date: 2020/12/07
- DOI: http://dx.doi.org/10.18462/iir.gl.2020.1104
Links
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Indexing
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Themes:
CO2;
Supermarkets, display cabinets;
Comfort air conditioning;
Thermal energy storage;
Energy efficiency, energy savings - Keywords: CO2; Supermarket; Simulation; Transcritical cycle; Sweden; Energy efficiency; Calculation; Air conditioning; Geothermy; Thermal energy storage; Energy consumption; Case study
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