空气源热泵空气侧换热器结构参数对结霜特性的影响

Research on Frosting Characteristic of Air Source Heat Pump under Different Structure Parameters of Airside Heat Exchanger

目的为解决空气源热泵冷热水机组冬季运行时空气侧换热器表面结霜问题,提高机组的综合运行性能,延长机组运行时间.方法采用分布参数法建立微分方程,并进行离散求解.结果分别计算了不同地区不同工况下,采用不同翅片间距、翅片管管径、管间距时,结霜速率、霜的密度、霜的厚度、空气侧压降及换热量等随时间的变化.不同工况下,空气侧换热器的结构参数不同,对机组性能的影响也不同.结论增大翅片间距可以延缓结霜,但对于不同湿度的地区,翅片间距应取不同的值.

This article studies the solutions to the problem of the frost formed on the surface of airside heat exchanger when air source heat pumps run in winter, In order to improve the synthetical running performance of the unit, to prolong running time of the unit. Using the distribution parameter method, established a differential equation, and made its discrete solutions, in this paper, the dynamic values of the frosting rate, density and thickness of frost, the pressure drop and heat flux are calculated under conditions of different distance of fins, diameter and distance of pipes. The result shows that the frost on airside heat exchanger will act differently on the performance of a unit when its structure parameters changed. The frosting course can be delayed by increasing the distance of fins. The distance of fins should vary with relative humidity for different district.