建立了变容量双级压缩热泵系统的仿真模型,通过实验数据对仿真模型进行了验证,并利用仿真模型对该系统进行了运行优化分析.结果表明,在冷凝工况固定时,低压级压缩机最优运行频率与环境温度近似呈线性变化,且随环境温度降低而增加;实际运行最优中间压力高于几何平均压力,其比值在1.20~1.56之间变化;所建立的低压级压缩机最优运行频率回归公式以蒸发、冷凝温度或蒸发、冷凝压力为变量,形式简单但具有足够的精度满足运行控制的需要.%A simulation model for a two-stage compression heat pump system with variable capacity was developed and verified by experimental data in this study, which was used to study the optimum heating performance of the system in operation.The results indicate that there is a linear relationship between the optimum operating frequency of the low-stage compressor and the environment temperature when the condensation condition is fixed.The lower the environment temperature, the larger is the optimum low-stage compressor frequency.The optimum intermediate pressure is higher than the geometric average pressure, with a ratio between 1.20 and 1.56.The regressed optimum frequency formula is based on evaporating and condensing temperature or pressure with a simple form, which meets the need for system control.
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