Correlation of forced-flow evaporation heat transfer coefficients in refrigerant systems

Conference · Fri Jul 01 04:00:00 EDT 1983 · HTD (Publ.) (Am. Soc. Mech. Eng.); (United States)

OSTI ID:5236687

Herd, K G; Connell, J W; Goss, W P

The accurate prediction of the forced-flow evaporation heat transfer coefficients for specific operating parameters (geometry, mass flux, thermodynamic and thermophysical properties of the working fluid(s), etc.) is of practical importance in the design of evaporator systems. The forced-flow evaporation process is dominated by two heat transfer mechanisms: surface nucleate boiling and forced convection to the liquid phase. In this paper, a modified form of the Chen superposition procedure is developed to predict refrigerant evaporation heat transfer coefficients in vertical, upwards flow by combining the effects of the nucleate boiling and forced convective mechanisms. Evaporation test data for several refrigerant systems (including R-22, R-113, R-114) were used to correlate the nucleate boiling and forced convective components for a wide range of operating conditions. A total of 691 data points were correlated with a mean absolute error of 8% between the predicted and measured heat transfer coefficients.

• Research Organization: Mechanical Engineering Department, University of Massachusetts at Amherst
• OSTI ID: 5236687
• Report Number(s): CONF-830702-
• Conference Information: Journal Name: HTD (Publ.) (Am. Soc. Mech. Eng.); (United States) Journal Volume: HTD-VOL.27
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOILING
CONVECTION
CORRELATIONS
ENERGY TRANSFER
EVAPORATION
EVAPORATORS
FLUIDS
FORCED CONVECTION
GEOMETRY
HEAT EXCHANGERS
HEAT TRANSFER
MATHEMATICS
NUCLEATE BOILING
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REFRIGERANTS
SURFACES
TESTING
THERMODYNAMIC PROPERTIES
WORKING FLUIDS