Experimental investigation on flow boiling heat transfer performance of a new near azeotropic refrigerant mixture R290/R32 in horizontal tubes

A new refrigerant mixture composed of R290 and R32 is proposed by the present paper. With a mass ratio of m32/m290 = 68/32, the new refrigerant mixture is near azeotropic, zero ODP and low GWP, which will be a competitive alternative refrigerant for R22 substitution instead of R410A and R407C. An experimental apparatus has been meticulously designed and built to analyze the flow boiling performance of this new refrigerant mixture. Flow boiling heat transfer performance of the new refrigerant mixture inside a single horizontal tube has been experimentally investigated.146