This paper presents pressure-drop data for inside evaporator and condenser
coils of refrigeration and air conditioning systems using hydrofluorocarbon
(HFC) refrigerants and blends. Computational fluid dynamics (CFD) was used
to simulate the two-phase flows of different refrigerants through two type
s of coil common to the evaporator and condenser components found in a typi
cal vapour-compression system. A comparison of single-phase and two-phase f
lows is made with respect to pressure drop across the evaporator, firstly a
t constant temperature for single-phase saturated vapour, and secondly at i
ncreasing temperature with varying components such as density and viscosity
for two-phase vapour. Pressure losses of HFC refrigerants and blends were
compared with data for conventional refrigerants and data provided by other
researchers. (C) 2001 Elsevier Science Ltd. All rights reserved.