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Abstract

Taking into consideration the substantial contribution of VCRS-based water chillers to building energy consumption, innovative approaches are needed to improve COP. One promising method involves the use of magnetization on the liquid line of the condenser, enhancing the performance of the system. In current research study, drop-in replacement effects were examined under the influence of two magnetic configurations: pair of magnets (MC-1) and a Halbach array (MC-2) with field strengths of 3000 G and 7200 G, respectively. The number of magnetizers was varied from 1 to 4. Tests were conducted at an ambient temperature of 28 ± 0.5°C, using R134a as the main refrigerant and R600a as the drop-in replacement. This study reports the influence of drop-in replacement on conventional water chiller. Further, the effects of magnetization on both systems have been discussed in detail. The maximum percentage enhancement in cooling effect for R134a with MC-1 and MC-2 was observed to be 5.70 and 8.92, respectively, and for R600a, it was found to be 6.19 and 9.77, respectively. Experimental findings revealed reductions in compressor power consumption by 2.9% for R134a and 5.88% for R600a with an increased number of magnetizers from 1 to 4 for MC-1. Additionally, for R134a and R600a with MC-2, reduction was found to be 4.85% and 7.97%, respectively. COP improvements of drop-in replacement water chillers were noted at 14.6% and 17.64% with MC-1 and MC-2, respectively, compared to the original system. Finally, significant reductions in CO₂ emissions of 35.7% and 37.37% were observed under MC-1 and MC-2, respectively.

Keywords

Magnetization Halbach array drop-in replacement hydrocarbon refrigerant COP

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Experimental investigation of R600a as a drop-in replacement for R134a in a VCRS-based magnetized water chiller

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