光热提温地源热泵系统最佳效率分析
Optimal Efficiency Analysis of Solar Thermal Heating Ground Source Heat Pump System

太阳能耦合地源热泵系统是一种将太阳能光热系统与地源热泵供暖系统相结合，并利用太阳能光热系统直接供暖后所余下的不可再为建筑供暖的“低温水”为地源热泵机组源侧提温继续为室内供暖，从而来提升热泵机组性能和提高可再生能源利用率的能源系统。本文通过实验进行数据整理分析，当蓄热水箱温度达到35℃时，着手运行源侧提温供暖系统模式为建筑供暖。并分析水箱温度从35℃持续下降期间，机组效率与水箱温度的关系以及计算出比较35℃时，机组最佳效率时性能提升率情况。实验结果表明：在水箱温度由35℃降至15℃的三组实验期间，地源热泵平均制热效率与水箱的出水温度呈线性关系。在35℃~25℃区间，制热效率随温度的降低而升高，25℃时平均效率达到最高的3.85。热泵机组的性能参数提升率为14.2%，之后效率随温度的降低而降低。
The solar coupled ground source heat pump system is an energy system that combines a solar thermal system with a ground source heat pump heating system, and uses the remaining “low-temperature water” that cannot be used for building heating after direct heating by the solar thermal system to heat the source side of the ground source heat pump unit and continue to provide indoor heating, thereby improving the performance of the heat pump unit and increasing the utilization rate of renewable energy. This article conducts data sorting and analysis through experiments. When the temperature of the thermal storage water tank reaches 35？C, the source side heating system mode starts to operate as building heating. The relationship between unit efficiency and water tank temperature during the continuous decrease of water tank temperature from 35？C is analyzed, and the performance improvement rate at the optimal efficiency of the unit when compared to 35？C is calculated. The experimental results showed that during the three experimental periods when the water tank temperature decreased from 35？C to 15？C, the average heating efficiency of the ground source heat pump was linearly related to the outlet temperature of the water tank. In the temperature range of 35？C~25？C, the heating efficiency increases with the decrease of temperature, and the average efficiency reaches the highest of 3.85 at 25？C. The performance parameter improvement rate of the heat pump unit is 14.2%, and then the efficiency decreases with the decrease of temperature.