论文部分内容阅读
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%。
Ground-source heat pump system perennial operation, if the extracted and released to the ground source of heat imbalance, can cause soil temperature changes in the buried pipe. For heating-dominated areas, this will result in lower soil temperatures and lower efficiency of ground-source heat pumps. The use of ground source heat pump solar collector system can solve this problem. In this paper, a system composed of ground-source heat pump coupled solar collectors with carbon dioxide as circulating working medium is established, and a sub-model of climate model, carbon dioxide heat pump unit, underground heat exchanger model, solar collector model and building model are established Based on each submodel, a prediction model of the performance of the solar assisted CO2-source ground-source heat pump system was developed. The experimental verification of the solar collector sub-model and the underground sub-heat exchanger model shows that the error of the temperature of the hot water in the solar collector sub-model is below 1 oC, Accuracy higher than 90%. Taking Trondheim Municipality of Norway as an example, the performance of the system was analyzed and compared with the conventional ground source heat pump system. The results show that the heat imbalance rate in soil after one year solar assisted ground source heat pump system can run from 95.1 % Down to 0.1%, the annual operating power decreased by 41.5%.