Accession Number : ADA133072

Title :   Fluidized Bed Air-to-Air Heat Pump Evaporator Evaluation.

Descriptive Note : Final rept. Oct 82-Sep 83,


Personal Author(s) : Ashley,Joseph L

PDF Url : ADA133072

Report Date : Jul 1983

Pagination or Media Count : 23

Abstract : Frost formation of air-to-air heat pump evaporator surfaces reduces unit efficiency and restricts application. The use of a fluidized bed heat exchanger as an air-to-heat pump evaporator was investigated to determine if frost accumulation could be eliminated. Experimental investigations were conducted and the following results obtained: (1) frost accumulation was insignificant with fluidized bed temperatures below 32 F and (2) moisture accumulation from condensation resulted in unstable fluidized bed operation when the fluidized bed temperature was above 32 F. Several concepts - maintenance bed temperature below 32 F, reverse refrigerant flow, air-dry bed, nonadhering bed material, and ultrasonics - to solve the moist bed problem were evaluated, with no practical solution being developed. The use of a fluidized bed heat exchanger for air-to-air heat pump evaporators was determined not feasible. (Author)

Descriptors :   *Fluidized bed processors, *Evaporators, *Heat pumps, *Heat exchangers, Fluidized bed processes, Air to air, Surfaces, Frost, Accumulation, Refrigerants, Temperature, Moisture, Condensation, Test methods, Efficiency

Subject Categories : Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE