太陽熱・廃熱利用によるエジェクタ冷凍サイクルの開発

抄録

The ejector cooling cycle can produce sustainable cooling from solar thermal energy and exhaust heat. In this paper, we first report a successful implementation of the ejector cooling cycle within an air compression cycle providing 70 °C waste heat. The refrigerant R134a used in this cycle provides good performance, however it has a high GWP (Global Warming Potential) and its high pressure induce high electricity consumption for the pump and supplementary costs as the main parts must be able to resist 2 MPa pressure at 70 °C. With the objective of developing an ejector cooling cycle with lower pressure and lower electricity consumption using a low GWP refrigerant, we propose a new design of an appropriate cycle working with R245fa : this refrigerant could be replaced by a new low GWP fluid, HCFO-1224yd(Z), reported as having very close properties to R245-fa by the manufacturer.