严寒地区太阳能-地源热泵与热网互补的运行模式

The Running Mode of the Solar Energy and Ground Source Heat Pump and Heating Network in Cold Regions

目的研究严寒地区太阳能-地源热泵与热网互补供热系统的运行特性,确定更适合严寒地区的运行模式.方法建立一套地埋管与两套地埋管两种模式的太阳能-地源热泵与热网互补供热系统;并对这两种模式下的运行特性进行分析比较.以TRNSYS瞬时模拟软件为平台,建立互补供热系统的仿真模型,对系统性能进行了仿真模拟.结果两套管时循环水的进出口平均温差为3.5℃,一套管时循环水的进出口平均温差为3.3℃,两套管高于一套管0.2℃;两套管的最大换热效率比一套管高35.5%,蓄热量高出89.5%;两套管的土壤蓄热体温度年变化量为0.17℃,一套管为0.66℃;系统运行十年后,两套管土壤蓄热体的温度从12℃下降到10.3℃,一套管从12℃下降到了5.4℃.结论两套地埋管的运行模式更加适合严寒地区互补供热系统的长年运行.

The operating characteristics of the solar-ground source heat pump and the heating network complementary system in cold area are studied to determine the suitable operation mode for the cold area.Two types of solar-ground source heat pump and heating network complementary heating system are established;one set of buried pipe and two sets of buried pipes,then the operation characteristics of the two modes are analyzed and compared.Based on the TRNSYS simulation software,the simulation model of the complementary heating system is established,and the system performance is simulated.The average temperature difference between the inlet and the outlet ofthe circulating water of two sets of buried pipes is 3.5 ℃,and that of one set of buried pipe is 3.3 ℃,so the two sets of buried pipes is 0.2 ℃ higher than the one set of buried pipe;the highest heat transfer efficiency of the two sets of buried pipes is 35.5% higher than that of the one set of buried pipe,and the heat storage capacity is 89.5% higher;The annual change in temperature of soil regenerator of the two sets of buried pipes is 0.17 ℃,while the one set of buried pipe is 0.66 ℃,after ten years of operation,the temperature of soil regenerator of the two sets of buried pipes decreases from 12 ℃ to 10.3 ℃,while the one set of buried pipe decreases from 12 ℃ to5.4 ℃.The operation mode of two sets of buried pipes is more suitable for the long-term operation of the complementary heating system in the cold area.