Article ID: 24-25LG
The performance of a 2 kW class heat pump cycle was calculated to evaluate COP, volumetric capacity, and irreversible losses for the binary mixture refrigerants containing HFO-1123 with a very low global warming potential, HFO-1123/R32, HFO-1123/R290, and HFO-1123/R152a. In the calculations, the minimum temperature difference at the outlet of the crossflow heat exchanger was fixed at 5 K assuming an air heat source, and the required heat transfer area was varied for comparison. At an HFO-1123 mass fraction of 0.6, HFO-1123/R32 exhibited the highest cooling COP of 6.1, meanwhile HFO-1123/R290 and HFO-1123/R152a exhibited COPs 1.1 and 1.4 lower than that. The large temperature glide increased the irreversible losses in the heat exchangers and significantly influenced the COP. Therefore, calculations were performed using a counter-flow heat exchanger model. The COP of HFO-1123/R290 was increased by 1.2 compared to that of the cross flow heat exchange, which was comparable to that of HFO-1123/R32.
