Heat recovery investigation of a supermarket refrigeration system using carbon dioxide as refrigerant
2014 (English)In: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014, International Institute of Refrigeration, 2014, 277-285 p.Conference paper (Refereed)
This study investigates the heat reclaim of trans-critical CO2-booster refrigeration unit in a supermarket in Sweden. The aim is to compare the control strategy for heat recovery in real supermarket installation to the optimum control strategy.
The optimum control strategy based on theoretical analysis is explained. By analyzing field measurement of a supermarket, heat recovery in the refrigeration system is studied and compared to the optimum case. To investigate the potential of higher heat recovery rate, a computer model is developed based on the optimum control strategy. The model is also used to calculate the boundary conditions at which the system should run for highest COP.
The results show that heat can be recovered at heating COP of 3-4.5. The theoretical analysis shows that the amount of heat that can be recovered from the refrigeration system is about 1.3 times (130 %) the cooling demand in the system. However the analysis of the field measurements shows that only between 30-60 % of the available heat to be recovered is utilized, the rest is released to outdoors. The analysis in this study shows that there is a potential to recover much more heat from the refrigeration system at relatively high heating COP compared to heat pump.
Place, publisher, year, edition, pages
International Institute of Refrigeration, 2014. 277-285 p.
supermarket refrigeration, CO2, trans-critical, heat recovery
IdentifiersURN: urn:nbn:se:kth:diva-175683ISI: 000352781600030ScopusID: 2-s2.0-84932143657ISBN: 9782362150043OAI: oai:DiVA.org:kth-175683DiVA: diva2:861907
11th IIR Gustav Lorentzen Conference on Natural Refrigerants, GL 2014; Shangri-La Hotel78 Beishan RoadHangzhou; China; 31 August 2014 through 2 September 2014
QC 201512162015-10-192015-10-192015-12-16Bibliographically approved