Abstract
A generalized method is proposed for calculating the pressure drop across pipe components containing two-phase flow of refrigerants mainly through return lines of pump and gravity feed evaporators including inlet and outlet manifolds, as well as return bends of evaporator and condenser coils. The method involves recalculating single-phase resistance to obtain two-phase resistance by means of a two-phase multiplier that has been generalized from experimental data published over recent years. Specific properties of generalized two-phase flow in straight pipes published in Int J Refrig (1989) 12 314–322 have been used. The method is simple and its accuracy corresponds to the level achieved for two-phase flows in straight pipes.
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