Taking the collector evaporator of the direct expansion solar heat pump system as the research object, a new type of optimized collector/evaporator was designed, and the differences in heat transfer capacity, temperature uniformity, and flow pressure loss between the prototype component and the optimized one were tested through experimental comparison. The research results show that under the working conditions of an ambient temperature of 4.7 ℃ and an average radiation intensity of 454.8 W/m2, the COP of the system using the new optimized components can reach 4.3, the heat gain factor is 1.752, and the dimensionless pressure loss is 0.05, which are better than the prototype components. It provides experimental verification for the design optimization theory of the collector/evaporator.
Key words
solar collector /
heat pump system /
evaporator /
coefficient of performance /
heat gain factor
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