Abstract
HFC-134a refrigerants have been adopted for centrifugal chiller since 1990s, however, GWP(Global Warming Potential)of HFCs are high, so that, there should be replaced to low GWP refrigerants to prevent global warming. The GWP of HFO-1234ze(E) is 6, and it is one of the leading candidates for replacement of HFC-134a for centrifugal chillers. We have installed HFO-1234ze(E) and evaluated the basic characteristics by using a centrifugal chiller. The cooling capacity with HFO-1234ze(E) is smaller than with HFC-134a to 70%, at same refrigerant gas volume flow. The COP with at rated capacity is less than that of HFC-134a by 6-3%. Part load performance with HFO-1234ze(E) is better than that of HFC-134a and IPLV is equivalent to HFC-134. So we confirmed that HFO-1234ze(E) is useful for the centrifugal chiller.
