全铝无接触热阻冷凝器的建模与性能测试

The steady state calculation model of aluminum non-contact thermal resistance condensers for air conditioning system was established by using distributed parameter method, and the performance of the all-aluminum non-contact thermal resistance condensers was tested with air enthalpy method. The calculation accuracy of the numerical model is verified by comparison with the experimental results. The results show that, under the same working conditions, the maximum error of heat exchange of the condenser is 4.8%, and the maximum error of air side pressure drop is 6.7%. The influence of condenser structure on its heat exchange performance and pressure drop was analyzed, and the comprehensive performance factor ε was employed to study the influence both of the heat exchange and the pressure drop of the air side on the performance of the condenser. The results show that the heat exchange capacity of the aluminum condenser decreases with the increase of the inner flow channel width b'; the heat exchange capacity of the aluminum condenser increases with the increase of the finned tube number n; the heat exchange capacity of the aluminum condenser increases with the increase of the finned tube width a; when the finned tube width a is 40mm, the finned tube number n is 22, and the inner flow channel width b' is 1.4mm, the condenser's heat exchange reaches the maximum, 3423.2W, and the air pressure drop is 19.15Pa; the heat exchange coefficient of the aluminum condenser increases first and then decreases with the increase of the finned tube width a, and the maximum value is obtained when the finned tube width a is 38 mm; the heat exchange coefficient increases with the increase of finned tube number n; the overall performance factor ε of the condenser increases first and then decreases with the increase of the finned tube width a, and increases with the increase of the finned tube number n.