Evaluation of Multistage Centrifugal Chiller Performance Metrics with Different Low Global Warming Potential Refrigerants

With a raising concern about climate change and global warming, various environmental regulations such as Kigali Amendment and EU Directive 517/2014 have already set the target to gradually phase out R134a and R123 refrigerants. In the current study, both the medium-pressure refrigerants (R134a and its alternatives R513A and R1234ze(E)) and low-pressure refrigerants (R123 and its alternatives R514A and R1233zd(E)) have been theoretically investigated for multistage chiller systems with a fixed cooling capacity. Compared with a single-stage chiller, a multistage chiller gives a ∼ 4