Heat transfer with phase change in plate-fin heat exchangers

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6820209

Panchal, C B

A theoretical and experimental study was conducted for convective evaporation and condensation in plate-fin compact heat exchangers. The overall performance of a brazed-aluminum heat exchanger in the evaporation mode with ammonia and in the condensation mode with both ammonia and refrigerant R-22 as working fluids. The heat exchanger has straight perforated fins on the working-fluid side and extruded rectangular channels on the single-phase (water) side. The two-phase flow in narrow channels of the heat exchanger is modeled using a triangular relationship between pressure gradient, liquid film flow rate, and film thickness. The overall performance of the heat exchanger is calculated by employing local heat-transfer analysis and integrating mass- and heat-balance equations along the heat-exchanger length. Theoretical predictions are found to agree favorably with experimental results for a prototypical heat exchanger unit.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6820209
• Report Number(s): CONF-840816-4; ON: DE84006405
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
AMMONIA
ENERGY TRANSFER
EVAPORATION
FINS
FLOW MODELS
FLOW RATE
FLUID FLOW
FLUIDS
HEAT EXCHANGERS
HEAT TRANSFER
HYDRIDES
HYDROGEN COMPOUNDS
MATERIALS
MATHEMATICAL MODELS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PERFORMANCE
PHASE CHANGE MATERIALS
PHASE TRANSFORMATIONS
PLATES
PRESSURE DROP
REFRIGERANTS
TWO-PHASE FLOW
VAPOR CONDENSATION
WORKING FLUIDS