The Research And Development Of Large Temperature Difference And High Static Pressure Fan Coil Units

In this paper, the research background is describedin detail from the macroeconomic environment, industrial policy adjustment, micro market environment, domestic and foreign central air-conditioning study situation. As one of the products with large use and wide coverage among central air-conditioning terminal system, if fan coil unit can achieve energy-saving operation, it will play an important role in energy conservation and emission reduction. And briefly introduces the research content, method and significance of the research.According to the comparison test result under different working conditions of the constant water temperature difference fan coil unit, the paper verifies the variation of the total cooling capacity, the sensible cooling capacity, the latent cooling capacity and the moisture separation coefficient with cooling water temperature increasetheoretically:1, to maintain the enterwater temperature of the fan coil unit, the higher the leaving water temperature, the lower the total cooling capacity, the sensible cooling capacity, the latent cooling capacity, and the more obvious the dehumidification ability reduction;2, when the constant water temperature difference fan coil unit is applied in the large temperature difference condition, the water flow reduction causes the unit cooling performance to drop sharply.According to the law above, it is concluded that the research and development of large temperature difference and high static pressure fan coil units is very necessary.The research and development of large temperature difference and high static pressure fan coil unit is divided into the structure design, prototype air flow test, cooling capacity test and the noise test. Among which, the structure design includes heat exchanger design, fan and motorselection; the performance test includes dry air flow test, fan performance curve drawing, cooling capacity test and water resistance curve drawing; the noise test includes NR curve drawing. Then to draw a large temperature difference and high static pressure fan coil unit performance curve according to the results above, which is convenientfor the sales staff rapid selectionon-site.Finally, design finalized on prototype, to prepare for marketing launch.