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Energetic performance of transcritical CO2 refrigeration cycles with mechanical subcooling using zeotropic mixture as refrigerant
Tianjin University of Commerce, Tianjin, China.
Tianjin University of Commerce, Tianjin, China.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. Tianjin University of Commerce, Tianjin, China.ORCID iD: 0000-0002-6279-4446
Tianjin University of Commerce, Tianjin, China.
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2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 150, p. 205-221Article in journal (Refereed) Published
Abstract [en]

Transcritical CO2 refrigeration cycle integrated with mechanical subcooling (MS) cycle operating with zeotropic mixture is proposed in this study, based on the concept of Lorenz cycle. An energetic model is developed and analyses are conducted in detail. A maximum overall coefficient of performance (COP) is achieved at the optimum discharge pressure and optimum subcooling degree. The maximum overall COP, optimum subcooling degree and discharge pressure are closely related to the temperature glide of the mixtures. The energy efficiency of the transcritical CO2 refrigeration cycle can be efficiently improved, and the high pressure can be reduced when mixtures with proper temperature glide are used as MS cycle refrigerant. Compared with pure R32, the overall COP is enhanced by 4.91%, and the discharge pressure decreases by 0.11 MPa at evaporation temperature of −5 °C and ambient temperature of 35 °C when R32/R1234ze(Z) (55/45) is employed as MS refrigerant. The mixtures with proper temperature glide are recommended. The thermal performance of the overall cycle can be enhanced more significantly for hot and warm climate regions, or relative low evaporation temperature applications, though a high subcooling degree is required to meet the optimum operation condition.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 150, p. 205-221
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-38847DOI: 10.1016/j.energy.2018.02.111ISI: 000431748400018Scopus ID: 2-s2.0-85042635481OAI: oai:DiVA.org:mdh-38847DiVA, id: diva2:1190651
Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2018-05-31Bibliographically approved

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Li, Hailong

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