Spray evaporation heat transfer of R-134A on plain tubes
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abstract
Spray evaporation tests were performed on refrigerant R-134a with horizontal, plain-surface, copper alloy tubes. In addition, the effects of nozzle type, liquid feed rate, and tube diameter on heat transfer coefficients were investigated. Pool boiling experiments were also performed and a comparison was made with spray evaporation results under similar conditions. Tubes of smaller diameter performed better than those with larger diameters, and the heat transfer performance was significantly affected by the liquid feed rate once dry-out effects became dominant. For the range of liquid feed rates evaluated, the heat transfer performance for spray evaporation was greater than the pool boiling performance at low heat fluxes and less at the higher heat fluxes.
