Comparative study on energy-saving performance of evaporative-cooling condenser systems in hot-humid climate

In order to evaluate and improve the application potential of the evaporative-cooling condenser (MVC-EC) system in the hot-humid climate area, a structurally optimized two-stage evaporative-cooling double condenser (MVC-TSEC) system is proposed, and a performance comparative study is carried out based on a detailed energy analysis model. Firstly, distributed parametric models of all components in each system are developed and verified by experimental data. Secondly, the effects of outdoor air temperature, relative humidity and room sensible cooling load on the COP and energy-saving rate of the two systems are analysed. Finally, the energy-saving potential of the two systems in typical hot-humid cities is evaluated. The results show that compared with MVC-EC system, MVC-TSEC system has a better energy-saving advantage under high temperature, medium-high humidity and high load conditions, and its energy-saving rate is about 4.3%-10.9% higher. Moreover, it can also increase the adaptive temperature of refrigerant systems by about 0.8-1.9 ℃. During June to August in Guangzhou and Changsha, the energy-saving rates of MVC-TSEC system are 12.7% and 21.1%, respectively, which are significantly higher than those of MVC-EC system (8.5% and 14.9%).