Study on optimization and time effect of ground-source heat pump system in Nanjing
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摘要:
地埋管换热器孔间距的合理设计是开发侵蚀堆积平原地区浅层地热能时需首先解决的问题。为了获得能供设计参考的地埋管换热器孔间距，确保地源热泵系统长期稳定运行，依托南京市秦淮区石门坎102号地源热泵试验工程，通过温度监测和数值模拟方法，研究了地埋管换热器孔间距和地源热泵系统10 a运行的时间效应，获得了南京侵蚀堆积平原地区地埋管换热器孔合理间距和运行方式。结果显示：（1）夏季工况、夏季后恢复工况、冬季工况、冬季后恢复工况的完整运行周期内，地层温度经历升温、降温、缓慢降温、基本恢复的周期性变化；（2）南京侵蚀堆积平原地区经济合理的地埋管换热器孔间距为4.0 m；（3）采取夏季制冷时间和冬季制热时间相等的运行方式，延长夏季后恢复工况，可确保地源热泵系统长期稳定运行。结果能为南京地区地埋管的设计和浅层地热能工程研究提供科学依据。
Abstract:The reasonable design of hole spacing for buried heat exchangers is the first issue to be solved when developing shallow geothermal energy in the Nanjing erosion and accumulation plain area. In order to obtain the hole spacing for design reference and ensure ground-source heat pump system to operate long and stably, based on the ground-source heat pump test project at No. 102 Shimenkan, Qinhuai District of Nanjing, the hole spacing of ground heat exchanger and time effect of 10-year operation with ground-source heat pump system have been studied with the temperature monitoring system and numerical simulation method, and the hole spacing of ground heat exchanger and the operation mode have been obtained. The results show that : (1) during the complete operation cycle of summer, post summer recovery, winter and post winter recovery working conditions of ground-source heat pump system, formation temperature undergoes periodic change of heating, cooling, slow cooling and basic recovery. (2) The economical and reasonable hole spacing of ground heat exchanger is 4.0 meters suitable for the erosion accumulation plain of Nanjing. (3) In order to eliminate the heat accumulation during the summer working condition and promote the service life of ground-source heat pump system, the operation mode of equal cooling time in the summer and heating time in the winter is suggested, and the post summer recovery working condition is extended as much as possible. This study can provide scientific basis for the design of buried pipes and shallow geothermal energy engineering research in the Nanjing area.
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表 1 岩土综合热物性参数测试结果
Table 1. Parameters of the rock-soil thermal properties
编号 深度/m 名称 含水率/% 密度/（g·cm−3） 孔隙率/% 导热系数/
（W·m−1·K−1）比热/
（J·g−1·K−1）热扩散率
/（10−5 m2·s−1）1 1.1～1.3 杂填土 27.6 1.850 0.465 0.53 1.59 2.30 3 3.1～3.3 素填土 25.8 1.977 0.420 1.12 1.53 4.79 4 4.1～4.3 粉质黏土 25.9 1.957 0.426 1.39 1.56 5.94 8 8.1～8.3 粉质黏土 25.8 1.978 0.420 1.00 1.47 4.46 11 12.3～12.5 粉质黏土 22.3 1.995 0.398 1.10 1.47 4.86 14 17.1～17.3 粉质黏土 22.3 2.001 0.396 1.52 1.57 6.30 Y13 23.1～23.3 强风化泥
质粉砂岩24.2 2.044 0.393 1.15 1.56 4.64 岩1 30.1～30.2 中风化泥
质粉砂岩3.6 2.433 0.133 1.77 1.01 9.36 岩2 40.3～40.5 中风化泥
质粉砂岩2.9 2.488 0.108 1.64 1.04 8.21 岩3 50.3～50.5 中风化
粉砂岩4.0 2.435 0.136 1.87 1.02 9.79 岩4 60.3～60.5 中风化
粉砂岩6.3 2.538 0.119 1.56 1.07 7.45 岩5 70.3～70.5 中风化
粉砂岩4.2 2.549 0.097 1.71 0.99 8.78 岩6 80.3～80.5 中风化
粉砂岩5.6 2.578 0.099 1.93 0.92 10.51 
下载: 导出CSV
表 2 模拟工况测试结果
Table 2. Results of the rock-soil thermal response test
参数类型 参数值 埋管内流体流量/（m3·h−1） 1.2 埋管内流体流速/（m·s−1） 0.628 钻孔岩土初始平均温度/°C 18.0 埋管进水温度/°C 37.0 埋管出水温度/°C 32.4 进出水温差/°C 4.6 进出口平均水温/°C 34.7 总散热量/kW 6.2 单位管长散热量/（W·m−1） 62.0 地层平均换热系数/（W·m−2·K−1） 3.76 冬季进出水平均温度/°C 7.5 冬季平均取热量/（W·m−1） 38.0
下载: 导出CSV
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