Energy assessment of an R134a refrigeration plant upgraded to an indirect system using R152a and R1234ze(E) as refrigerants
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Other documents of the author: Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo; Catalán-Gil, Jesús; Nebot-Andres, Laura
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comunitat-uji-handle3:10234/8617
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Title
Energy assessment of an R134a refrigeration plant upgraded to an indirect system using R152a and R1234ze(E) as refrigerantsAuthor (s)
Date
2018-07-05Publisher
ElsevierISSN
1359-4311; 1873-5606Bibliographic citation
SÁNCHEZ, D., et al. Energy assessment of an R134a refrigeration plant upgraded to an indirect system using R152a and R1234ze (E) as refrigerants. Applied Thermal Engineering, 2018, vol. 139, p. 121-134Type
info:eu-repo/semantics/articlePublisher version
https://www.sciencedirect.com/science/article/pii/S1359431117380316Version
info:eu-repo/semantics/submittedVersionSubject
Abstract
In this work the experimental results obtained from a direct expansion refrigerating plant converted into an indirect plant, are presented and discussed in terms of energy consumption for a commercial refrigerating ... [+]
In this work the experimental results obtained from a direct expansion refrigerating plant converted into an indirect plant, are presented and discussed in terms of energy consumption for a commercial refrigerating unit plugged to a medium temperature cabinet. Refrigerants used in the analysis are R134a for direct system, and R134a, R152a and R1234ze(E) for indirect system. The evaluation has been performed at laboratory conditions using three different heat rejection levels: 43.6, 32.8 and 23.3 °C keeping constant the environmental conditions in the cabinet (25 °C; 55%). From the experimental tests performed during 24 h, it has been demonstrated that the adoption of an indirect configuration results in an increment of the total energy consumption of the refrigerating plant regardless the refrigerant adopted. The average increment registered was 21.8% for R134a, 18.7% for R152a and finally 27.2% for R1234ze(E). The adoption of an indirect system also reduces the refrigerant mass charge of the facility up to 62% depending on the refrigerant used. [-]
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Applied Thermal Engineering, 2018, vol. 139Rights
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