Parametric Evaluation of the Flow Boiling Heat Transfer Properties of R22 and R407c inside Horizontal Microfin Tube

Table 1

Properties of working refrigerants [35, 36].

Refrigerant	R22		R407c
Composition	Pure		Blended (R32 (23%), R125 (25%), R134a (52%))
ASHRAE safety guideline	A1		A1
ODP	0.055		0
GWP	1810		1530
(kg. Kmol^-1)	86.468		86.2
(kPa)	4977.37		4619.11
(K)	369.15		359.89
Thermophysical properties of refrigerants
Property	R22		R407c
(K)	293.15	313.15	293.15	313.15
(kg.m^-3)	1209.9	1128.5	1158.7	1067.8
(kPa)	910.02	1533.6	1037.6	1748.9
(kJ.Kg^-1)	187.60	166.60	189.02	164.06
(J.g^-1 K^-1)	1.2356	1.3389	1.505	1.657
(N.m^-1)	0.0088	0.006036	0.0077	0.0049
(W.m^-1 K^-1)	0.0857	0.0766	0.0885	0.0785
(μPa.s)	173.70	138.67	173.56	133.15