夏热冬冷地区地源热泵系统运行特性分析

发布时间：2018-05-26 04:15

  本文选题：地源热泵系统 + 热平衡　； 参考：《扬州大学》2014年硕士论文

【摘要】：地埋管地源热泵是一种随着能源危机和环境污染加深而兴起的可再生能源利用空调系统,该系统具有高效节能、无环境污染、稳定性好、运行费用低等优点。地源热泵技术的理论研究和设计应用在国内外已经非常成熟,但是系统的运行管理才是实现该系统高效节能的关键,因此,本文针对扬州市某住宅小区的地源热泵系统进行了测试,分析夏热冬冷地区地源热泵系统运行特性,并建立地埋管换热器模型,预测该系统未来是否存在热平衡问题。 首先,对国内外的能源利用现状、地源热泵系统的技术研究和应用市场、地源热泵系统的发展前景和国内关于发展地源热泵的法律法规及地方省市的鼓励政策进行了综合性的分析。 其次,对扬州市某地源热泵系统历年运行数据进行了分析,对该系统夏季运行工况进行了测试和调整,并分析系统夏季运行特性。分析的内容为：空调系统瞬时负荷分析；设计负荷与实际负荷误差分析；土壤全年吸放热量分析；系统热平衡问题分析；地源热泵机组性能系数分析；系统能效比分析；系统能耗分析；土壤温度恢复情况分析。 然后,利用ANSYS-CFX模拟软件建立了地埋管换热器模型,对地埋管换热器布置区域的土壤温度场进行模拟分析,并利用系统历年的实测数据验证模型的正确性,模拟值与实测值绝对误差为2.5%,精确性较高。 最后,利用地埋管换热器模型分别对本工程入住率稳定在50%工况和入住率每年增加10%工况进行了模拟,预测土壤温度场五年的温度变化。得到结论：本小区在入住率恒定50%的条件下,未来五年土壤温度降低不明显,不存在明显热平衡问题,不影响机组正常运行；在入住率每年增加10%的条件下,未来五年土壤平均温度约降低了2.5℃,系统存在热平衡问题,如不采取相应措施,将影响系统能效。并提出了相应的解决方案。
[Abstract]:Ground source heat pump (GSHP) is a kind of renewable energy utilization air conditioning system with energy crisis and environmental pollution. It has the advantages of high efficiency, no environmental pollution, good stability and low operating cost. The theoretical research and design and application of ground-source heat pump technology have been very mature at home and abroad, but the operation and management of the system is the key to realize the high efficiency and energy saving of the system. In this paper, the ground-source heat pump system in a residential district in Yangzhou is tested, the operating characteristics of ground-source heat pump system in hot summer and cold winter area are analyzed, and the ground source heat exchanger model is established to predict whether the system will have heat balance in the future. First of all, to the domestic and foreign energy utilization present situation, the ground source heat pump system technical research and the application market, The prospect of ground-source heat pump system and the domestic laws and regulations on the development of ground-source heat pump system as well as the encouragement policies of local provinces and cities are comprehensively analyzed. Secondly, the operating data of a ground-source heat pump system in Yangzhou City are analyzed, the operating conditions of the system in summer are tested and adjusted, and the operating characteristics of the system in summer are analyzed. The contents of the analysis are as follows: instantaneous load analysis of air conditioning system; error analysis of design load and actual load; analysis of annual soil heat absorption and emission; analysis of system heat balance; analysis of performance coefficient of ground source heat pump unit; analysis of system energy efficiency ratio; System energy consumption analysis; soil temperature recovery analysis. Then, the ground tube heat exchanger model is established by using ANSYS-CFX software, and the soil temperature field of the ground buried tube heat exchanger arrangement area is simulated and analyzed, and the correctness of the model is verified by the measured data of the system over the years. The absolute error between the simulated value and the measured value is 2.5 and the accuracy is high. Finally, the model of underground tube heat exchanger was used to simulate the steady occupancy rate of the project at 50% and the increase of the occupancy rate by 10% per year, respectively, and to predict the temperature change of the soil temperature field for five years. It is concluded that under the condition of constant occupancy rate of 50%, the soil temperature will not decrease obviously in the next five years, there will be no obvious heat balance problem, and the normal operation of the unit will not be affected. Under the condition that the occupancy rate increases by 10% per year, In the next five years, the average soil temperature will be reduced by 2.5 鈩，

本文编号：1935905