Performance and selection of fan-coil units with large temperature diff

The fan-coil unit with conventional supply and return water temperature is sometimes used as the end product of large temperature difference chilled water system in engineering. As the water flow process of the conventional fan-coil unit has not been changed, the water flow of the unit will decrease and the water velocity will decrease greatly when the temperature difference between supply and return water increases. This will lead to a reduction in water resistance and may cause the hydraulic imbalance of the water system and other problems, which is not conducive to improving the energy saving effect of the large temperature difference chilled water system, nor to the application of the large temperature difference fan-coil unit. Combined with years of research, application and measurement, the characteristics and selection method of water side large temperature difference fan-coil unit are presented.