R1224yd(Z)を用いたエジェクタ冷凍サイクルのエクセルギーによる性能評価の検討

抄録

Cooling demand has been increasing globally, which has caused an increase in electricity demand. There is a large amount of unused heat, such as waste and solar heat, which can supply cooling heat with smaller electricity consumption by using heat-driven refrigeration systems. We have investigated an ejector refrigeration cycle as one of the heat-driven refrigeration systems that can be driven by a lower-temperature heat source than absorption or adsorption refrigeration systems. Testing the performance of the ejector refrigeration cycle using R1224yd(Z) as a working fluid has already been reported as the COP, refrigeration capacity to the electric power consumption of feed pump, reached over 40. The COP is not a convenient index for evaluating the system because we can not know the distance from the theoretical efficiency, and it is not convenient for comparison with other energy-conversion systems. The theoretical efficiency is presented as unity of the exergy efficiency for any energy-conversion system. The exergy efficiency of our ejector refrigeration cycle testing device reaches 0.33, which is greater than that of PV solar panels, similar to that of air conditioning systems, but smaller than that of a power plant.