Calculation of Heat Transfer Coefficient of Wavy Fin-and-tube Heat Exchanger of Air Source-heat Pump

摘要

Air side heat transfer coefficient is a key problem to study thermal regime of air-cooled units. Five commonly used equations for calculating the heat transfer coefficient of wavy fin and tube heat exchanger of air source heat pump and scope of application were analyzed. According to the typical example, all the solutions of equation are calculated for the five methods. Comparing between theoretical data and experimental data, the experimental results are basically consistent with the theoretical solution J factor method and McQuiston method is recommended as the optimal method for calculating the heat transfer coefficient of wavy fin and tube heat exchanger. It is provided theoretical basis on optimal design and thermal characteristics. Air-cooled heat pump achieve heat transfer between refrigerant and air in the air-side heat exchanger, so accurate calculation of the air-side heat transfer coefficient is the premise of the unit design and research and development. There are many ways of calculation of the air-side heat transfer coefficient, and every formula has its own conditions of use. Studied in this paper is corrugated finned tubes of the outdoor side heat exchanger, cited several different heat transfer coefficient calculation formula; According to a typical example, all the theoretical solutions of formula are calculated for the different method. Comparing between theoretical data and experimental data, the optimal method for calculating the heat transfer coefficient of wavy fin and tube heat exchanger is recommended.