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Appl. Sci. 2018, 8(2), 247; https://doi.org/10.3390/app8020247

Conversion of a Direct to an Indirect Refrigeration System at Medium Temperature Using R-134a and R-507A: An Energy Impact Analysis

Department of Mechanical Engineering and Construction, Campus del Riu Sec. s/n, Jaume I University, E-12071 Castellón, Spain
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Received: 2 January 2018 / Revised: 30 January 2018 / Accepted: 1 February 2018 / Published: 6 February 2018
(This article belongs to the Special Issue Sciences in Heat Pump and Refrigeration)
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Abstract

This work presents the experimental evaluation of energy consumption and refrigerant charge reduction when a commercial direct expansion refrigeration system is converted into an indirect system. The evaluation (with R-134a and R-507A) used a commercial cabinet with doors for medium temperature and a single-stage refrigeration cycle using a semi-hermetic compressor and electronic expansion valve; 24-h energy consumption tests were performed at laboratory conditions for each refrigerant and configuration at three heat rejection levels (23.3, 32.8 and 43.6 °C), maintaining an average product temperature inside the cabinet of 2 °C. The work analyses the impact of the conversion on temperature and pressure indicators, as well as, in the energy performance of each element. For R-134a the refrigerant charge was reduced in a 42.9%, but the energy consumption rose by 22.0%–22.8%; for R-507A the charge reduction was of 32.8% with an increase in energy consumption of between 27.7% and 38.7%. View Full-Text
Keywords: R-134a; R-507A; indirect system; commercial refrigeration; energy analysis R-134a; R-507A; indirect system; commercial refrigeration; energy analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Llopis, R.; Sánchez, D.; Cabello, R.; Catalán-Gil, J.; Nebot-Andrés, L. Conversion of a Direct to an Indirect Refrigeration System at Medium Temperature Using R-134a and R-507A: An Energy Impact Analysis. Appl. Sci. 2018, 8, 247.

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