Application performances of ordinary fan-coil unit to water systems with large temperature difference

Studies the performance of cooling capacity, heat transfer coefficient, heat transfer temperature difference, ratio of total capacity to sensible capacity，water flow resistance of ordinary fan-coil under different inlet water temperature and temperature difference conditions by a verified numerical method. Analyses the influence of inlet water temperature and temperature difference on refrigerating capacity, and obtains the optimal chilled water temperature difference. The results show that the water flow resistance of fan-coil drops sharply under large temperature difference conditions, easily resulting in the hydraulic imbalance of air conditioning system. It is improper to apply ordinary fan-coil to a water system with large temperature difference, and it is recommended that special fan-coil units be developed to meet the energy saving demand.