变片距换热器空气源热泵机组结霜特性分析

Characteristic analysis on air source heat pump with variable spacing fin heat exchanger in frosting condition

为了比较变片距与等片距室外换热器空气源热泵冷热水机组的性能,在质量守恒、能量守恒的条件下建立系统动态模型,利用数值模拟对变片距与传统换热器的空气源热泵运行特性比较.仿真结果表明,在入口空气参数和初始蒸发温度相同的条件下,变片距换热器空气源热泵机组运行时蒸发温度、冷凝温度、制冷剂流量、水侧换热量、出水温度均大于等片距换热器空气源热泵机组,从而使得机组供热性能系数提高,并有效延长了换热器结霜周期.

Aiming at comparing performance of air source heat pump with variable spacing fin heat exchanger and constant spacing fin heat exchanger, a dynamic mathematic model was founded based on mass and energy conservation. The variable and constant spacing fin heat exchangers＇ system performance was compared by numerical simulation. The simulation results showed that COP of heat pump with variable spacing fin heat exchanger is higher than heat pump with constant spacing fin heat exchanger under the same air input parameter and initial evaporating temperature, and the variable spacing fin heat exchanger delays frost.