地源热泵系统常年运行时，如果提取和释放到地源的热量不平衡，会造成埋管区域土壤温度变化问题。对于供热为主地区，这会导致土壤温度降低，地源热泵运行效率降低。采用地源热泵耦合太阳能集热系统的方法，可以解决此问题。本文针对以二氧化碳为循环工质的地源热泵耦合太阳能集热器组成的系统，建立了气候模型、二氧化碳热泵机组模型、地下埋管换热器模型、太阳能集热器模型以及建筑模型等子模型，并基于各个子模型开发了太阳能辅助二氧化碳地源热泵系统性能的预测模型。通过已有对太阳能集热器子模型和地下埋管换热器子模型进行的实验验证表明，太阳能集热器子模型得到热水温度误差在1 oC 以下，地下埋管换热器子模型的精度高于90%。以挪威特隆赫姆市为例，对系统性能进行了分析，并与常规地源热泵系统进行对比分析，结果表明，太阳能辅助地源热泵系统运行一年后土壤中热不平衡率可以从95.1%降到0.1%以下，年运行功率降低41.5%。%If the heat injected and extracted from the soil is unbalanced when a ground source heat pump (GSHP) is operating, the soil temperature will change gradually. For the areas with higher heating demands than cooling demands, the soil temperature becomes lower and finally jeopardizes the function of the GSHP. Using solar assisted ground source heat pump system is one way to solve the problem. In this paper, the weather model, CO2 heat pump model, the ground source heat exchanger model, the solar collector model and the building model were developed, and the performance prediction model for the solar assisted CO2 ground source heat pump system was developed based on the submodels. The experimental validation for solar collector model and ground source heat exchanger model was analyzed based on the existing experimental data;the validation results show that, the deviation of the predicted hot water temperature is smaller than 1 oC, and the prediction accuracy of the ground source heat exchanger model is higher than 90%. Taking Trondheim of Norway as example, the performance of the proposed system was analyzed and compared with that of normal ground source heat pump system;the results show that, the heat unbalance rate for the solar assisted ground source heat pump system after operation of one year is reduced from 95.1%to lower than 0.1%, and energy consumption is decreased by 41.5%.
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