Thermal balance analysis based on heat transfer characteristics of fan-coil units

In order to strengthen the basic research on the energy saving operation control technology of variable flow chilled water systems under the premise of ensuring the design service quality of central air conditioning systems, based on the experimental data of a fan-coil unit prototype obtained by variable flow regulation under the rated test conditions specified in GB/T 19232-2003 Fan-coil unit, analyses and discusses the effects of the thermal balance between air and water sides, heat exchange time lag, chilled water flow characteristics and water supply temperature on heat transfer characteristics. Emphasizes that the hysteresis property of heat transfer time between the air and water sides of surface coolers should be paid attention to, and puts forward different opinions for the application of heat transfer characteristics.