土壤源热泵系统设计方法研究与地埋管换热器参数优化
发布时间：2019-05-28 18:20
【摘要】：地源热泵系统作为一项节能环保的技术,越来越被人们所熟知,可以有效的解决一些国家的能源危机、提高能源使用率。目前,国内外关于地源热泵技术方面研究的热门课题之一是地源热泵系统在不同地区、不同气候条件下的适用性问题。 本课题主要做了以下研究工作： 1.分析土壤源热泵系统地埋管换热器的传热机理,为TRNSYS模拟软件模拟系统运行奠定理论基础； 2.以TRNSYS模拟软件为平台,建立整个土壤源热泵系统模型,逐时分析建筑物的动态负荷变化,得出建筑物所需的冷热负荷。研究系统化土壤源热泵系统设计方法,并通过实际运行的项目检测数据,分析整个系统的运行情况； 3.利用TRNSYS模拟软件,研究在不同气候区,针对寒冷和夏热冬冷气候区,寻找两个典型城市—西安和无锡,研究地埋管换热器侧进出水温度的限值问题； 4.采用费用年值法,分析经济性,寻找机组最大出力,耗功最小,经济最合理时候,所对应的地埋管换热器侧进出水温度的限值,提高土壤源热泵系统效率,对系统进行优化分析。 本课题通过理论分析,试验数据和模拟分析,得出以下主要结论： 1.地埋管换热器的地下传热是一个复杂的过程,地埋管换热器中的循环液在土壤中是一个非稳态传热过程,推导出蓄热器中某一节点的温度表达式； 2.通过岩土热响应测试,可知在上海和无锡地区土壤的初始温度较高,而西安地区的土壤初始温度较低。在上海和无锡地区,建筑物的冷热负荷不平衡,夏季冷负荷明显多余冬季热负荷,这与室外气象条件有关,在土壤源热泵系统设计过程中,需要添加辅助热源—冷却塔,以保证地埋管侧吸排热量相等。 3.在寒冷气候区的西安市,对比分析不同地埋管换热器进出口水温的限定值,通过分析能耗和经济性,费用年值最小的即为最佳温度限值。所以,在寒冷气候区,冬季工况地埋管换热器最佳进口温度宜在5℃以上,而夏季工况地埋管换热器出口温度适宜在32℃以下； 4.在夏热冬冷气候区的无锡市,机组出力最大和费用年值最小所对应的夏季工况下地埋管换热器出口的最佳温度宜在31℃以下,而冬季工况地埋管换热器进口温度适宜在4.5℃以上。
[Abstract]:As an energy saving and environmental protection technology, ground source heat pump system is more and more well known, which can effectively solve the energy crisis and improve the energy utilization rate in some countries. At present, one of the hot topics in the field of ground source heat pump technology at home and abroad is the applicability of ground source heat pump system in different areas and different climatic conditions. The main research work of this subject is as follows: 1. The heat transfer mechanism of ground source heat pump system is analyzed, which lays a theoretical foundation for the operation of TRNSYS simulation software. Based on TRNSYS simulation software, the whole ground source heat pump system model is established, the dynamic load change of the building is analyzed time by time, and the cold and heat load of the building is obtained. The design method of systematic ground source heat pump system is studied, and the operation of the whole system is analyzed through the test data of the actual operation project. Using TRNSYS simulation software, this paper studies the limit value of inlet and outlet water temperature on the side of buried pipe heat exchanger in different climate areas, aiming at cold and hot summer and cold winter climate areas, Xi'an and Wuxi. The annual cost method is used to analyze the economy, to find out the maximum output of the unit, the least power consumption and the most reasonable economy, and the corresponding limit value of the inlet and outlet water temperature on the side of the buried pipe heat exchanger is used to improve the efficiency of the ground source heat pump system. The system is optimized and analyzed. Through theoretical analysis, experimental data and simulation analysis, the following main conclusions are drawn: 1. The underground heat transfer of underground pipe heat exchanger is a complex process. The circulating liquid in the underground pipe heat exchanger is an unstable heat transfer process in the soil, and the temperature expression of a node in the heat accumulator is derived. Through the test of geotechnical thermal response, it can be seen that the initial temperature of soil is higher in Shanghai and Wuxi area, but lower in Xi'an area. In Shanghai and Wuxi areas, the cooling load of buildings is unbalanced, and the cooling load in summer is obviously redundant in winter, which is related to outdoor meteorological conditions. In the design process of ground source heat pump system, it is necessary to add auxiliary heat source cooling tower. To ensure that the side suction and exhaust heat of the buried pipe is equal. 3. In Xi'an, in the cold climate area, the limit values of the inlet and outlet water temperature of different buried pipe heat exchangers are compared and analyzed. By analyzing the energy consumption and economy, the minimum annual cost is the best temperature limit. Therefore, in the cold climate area, the optimum inlet temperature of the buried pipe heat exchanger in winter condition should be above 5 鈩，
本文编号：2487260
[Abstract]:As an energy saving and environmental protection technology, ground source heat pump system is more and more well known, which can effectively solve the energy crisis and improve the energy utilization rate in some countries. At present, one of the hot topics in the field of ground source heat pump technology at home and abroad is the applicability of ground source heat pump system in different areas and different climatic conditions. The main research work of this subject is as follows: 1. The heat transfer mechanism of ground source heat pump system is analyzed, which lays a theoretical foundation for the operation of TRNSYS simulation software. Based on TRNSYS simulation software, the whole ground source heat pump system model is established, the dynamic load change of the building is analyzed time by time, and the cold and heat load of the building is obtained. The design method of systematic ground source heat pump system is studied, and the operation of the whole system is analyzed through the test data of the actual operation project. Using TRNSYS simulation software, this paper studies the limit value of inlet and outlet water temperature on the side of buried pipe heat exchanger in different climate areas, aiming at cold and hot summer and cold winter climate areas, Xi'an and Wuxi. The annual cost method is used to analyze the economy, to find out the maximum output of the unit, the least power consumption and the most reasonable economy, and the corresponding limit value of the inlet and outlet water temperature on the side of the buried pipe heat exchanger is used to improve the efficiency of the ground source heat pump system. The system is optimized and analyzed. Through theoretical analysis, experimental data and simulation analysis, the following main conclusions are drawn: 1. The underground heat transfer of underground pipe heat exchanger is a complex process. The circulating liquid in the underground pipe heat exchanger is an unstable heat transfer process in the soil, and the temperature expression of a node in the heat accumulator is derived. Through the test of geotechnical thermal response, it can be seen that the initial temperature of soil is higher in Shanghai and Wuxi area, but lower in Xi'an area. In Shanghai and Wuxi areas, the cooling load of buildings is unbalanced, and the cooling load in summer is obviously redundant in winter, which is related to outdoor meteorological conditions. In the design process of ground source heat pump system, it is necessary to add auxiliary heat source cooling tower. To ensure that the side suction and exhaust heat of the buried pipe is equal. 3. In Xi'an, in the cold climate area, the limit values of the inlet and outlet water temperature of different buried pipe heat exchangers are compared and analyzed. By analyzing the energy consumption and economy, the minimum annual cost is the best temperature limit. Therefore, in the cold climate area, the optimum inlet temperature of the buried pipe heat exchanger in winter condition should be above 5 鈩，
本文编号：2487260
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