R1234ze(Z) and R1233zd(E) vaporisation inside a Brazed Plate Heat Exchanger (BPHE)

摘要

This paper presents the boiling heat transfer coefficients of R1234ze(Z) and R1233zd(E) inside acommercial Brazed Plate Heat Exchanger (BPHE): the effects of heat flux / mass flux, saturationtemperature / pressure, outlet conditions and fluid properties are investigated. The boiling heattransfer coefficients are controlled mainly by heat flux / mass flux and evaporator outlet conditions.R1234ze(Z) exhibits boiling heat transfer coefficients higher than those of R1233zd(E). There is areasonable agreement between the saturated boiling heat transfer coefficients and the calculatedvalues by a model recently proposed by the present authors.