Screening for eco-friendly working fluids with high-energy efficiency is one of the highest challenges in the air conditioning sector. The present research aims to investigate and compare the performance characteristics of fourteen promising low global warming potential working fluids, less than 150, in solar organic Rankine cycle powered vapour compression cycle for air conditioning of residential buildings. The working fluids selected are R152a, R161, R1234yf, R1234ze(E), R1233zd(E), R290, R1270, R600a, R600, R601a, R601, R13I1, RE170 and R123. The performance characteristics investigated are the organic Rankine cycle efficiency (ηORC), the ratio (WRm) of network output (Wnet) for the organic Rankine cycle to mass flow (mORC) rate for organic Rankine cycle, volumetric flow ratio (VFR), expander size parameter (SP), cooling power (Qeva) of vapour compression cycle, coefficient of performance (COPVCC) of vapour compression cycle, coefficient of performance (COPs) of the organic Rankine cycle–vapour compression cycle system, the ratio (CPRm) of cooling power (Qeva) to (mORC+mVCC), and the total efficiency of solar air conditioning system (ηt). The investigated results proved that the working fluid RE170 (global warming potential = 1) is the most suitable working fluid for the organic Rankine cycle–vapour compression cycle system through the comprehensive comparison of ηORC, WRm, VFR, SP, Qeva, COPVCC , COPs, CPRm and ηt for the fourteen working fluids.
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Maalem et al. (2025) studied this question.
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