Review of recent research on heat transfer with mixtures. Part 1: Condensation

Conference · Tue Aug 01 04:00:00 EDT 1995

OSTI ID:87485

Wang, S P; Chato, J C ^[1]

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1. Univ. of Illinois, Urbana, IL (United States)

During the past 10 years, interest in heat transfer with mixtures has increased for several reasons. First, the use of zeotropic refrigerant mixtures (ZERMs) as working fluids in heat pump and refrigeration systems indicates potential advantages in efficiency and capacity. Second, ZERMs are prospective substitutes for chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) refrigerants (such as R12, R-11, and R-22). However, before the refrigerant mixtures will be put to use in heat pump, refrigerator, and air conditioning systems, the problem of possibly changed heat transfer performance and pressure drop in condensation processes has to be considered to realize the claimed advantages. Thus, it is necessary to study the mechanisms of condensation with mixtures. In this paper, a companion to one on boiling and evaporation, the recent research on condensation heat transfer with mixtures is reviewed. The main points are the thermal resistance of the vapor diffusion layer affecting the condensation, the influence of the flow direction of vapor on the condensation, the turbulence in the vapor generated by the fins, and the enhancement of the condensation performance of mixtures. This review is mainly concerned with the condensation of miscible mixtures, especially ZERMs. Only a few selected papers related to immiscible mixtures are reviewed here.

• OSTI ID: 87485
• Report Number(s): CONF-950104--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
CHLOROFLUOROCARBONS
CONVECTION
HEAT EXCHANGERS
MATERIAL SUBSTITUTION
REFRIGERANTS
VAPOR CONDENSATION