| 不同抽回间距的单井循环地下水源热泵系统试验 |
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| 引用本文： | 宋 伟,倪 龙,姚 杨.不同抽回间距的单井循环地下水源热泵系统试验[J].农业工程学报,2014,30(2):205-211. |
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| 作者姓名： | 宋 伟 倪 龙 姚 杨 |
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| 作者单位： | 哈尔滨工业大学 热泵空调技术研究所，哈尔滨 150090;哈尔滨工业大学 热泵空调技术研究所，哈尔滨 150090;哈尔滨工业大学 热泵空调技术研究所，哈尔滨 150090 |
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| 基金项目： | 国家自然科学基金资助项目 (41002085) |
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| 摘 要： | 针对单井循环地下水源热泵系统的研究不足,搭建了物理模拟砂箱试验台研究单井循环地下水源热泵系统地下水流动和换热规律,并开展了抽回间距变化的试验研究。结果表明,增大抽回间距能够显著改善三种热源井的抽水温度,在条件允许的情况下应尽量增大热源井的抽回间距;当抽回间距增加相同数值,抽水温度改善情况循环单井最好,其次是填砾同井,最后是抽灌同井,增加抽回间距对热贯通严重的热源井更有效。
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| 关 键 词： | 泵 地下水 试验 单井 砂箱 抽回间距 |
| 收稿时间： | 2013/9/25 0:00:00 |
| 修稿时间： | 1/4/2014 12:00:00 AM |
Experiment on single well groundwater heat pump systems in different distances between pumping and injection screens |
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| Song Wei,Ni Long and Yao Yang.Experiment on single well groundwater heat pump systems in different distances between pumping and injection screens[J].Transactions of the Chinese Society of Agricultural Engineering,2014,30(2):205-211. |
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| Authors: | Song Wei Ni Long and Yao Yang |
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| Institution: | Institute of Heat Pump and Air Conditioning Technology, Harbin Institute of Technology, Harbin 150090, China;Institute of Heat Pump and Air Conditioning Technology, Harbin Institute of Technology, Harbin 150090, China;Institute of Heat Pump and Air Conditioning Technology, Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: | Abstract: As the global energy crises and environmental problems become more and more serious, ground source heat pump (GSHP) systems are perhaps the most widely used green HVAC system, with an estimated 1.1 million ground source heat pumps installed worldwide. These systems have become an important energy-saving and environment protection technology for use in residential and commercial buildings in China. These applications included two types of systems: closed-loop (ground-coupled) and open-loop. As one kind of semi-closed-loop systems, single well groundwater heat pump (SWGWHP) systems have become increasingly popular for use because of their economic advantages from lower installation cost, lower operating cost, and improved overall performance in regions with suitable geological conditions. In general, SWGWHP systems included three different variations, i.e. standing column well (SCW) system, pumping & recharging well (PRW) system, and pumping & recharging well filled with gravel (PRWFG) system. Compared with SCW system, the well pipe in PRW system and PRWFG system are divided into three parts by clapboards, i.e. production zone, seals zone and injection zone. In recent decades, considerable research efforts have been spent on SWGWHP systems, especially on SCW system. However, little attention has been focused on the PRW system and PRWFG system. For GSHP systems, sand tank experiment is one of the important methods of laboratory investigation for discussing the performance of geothermal heat exchanger, due to many parameters can be set and adjusted more easily and economically than that in in-situ experiments. In order to provide a framework for discussing the influence on distances between pumping and injection screens (DPI) in SWGWHP systems, a sand tank experiment system was designed and set up in Harbin Institute of Technology, China. In this study, we tested the temperature of outlet and inlet water, the aquifer temperature, and flow rate of outlet water. From the reasonable results obtained in these tests, the absorption and rejection quantities of SWGWHP systems were calculated. The results pointed out that with increasing the DPI, the outlet water temperature and heat transfer quantities of these three kinds of thermal wells can be improved significantly. When the conditions permit, the DPI should be increased greatly. Additionally, when the DPI increases the same value, the improvements of outlet water temperature are as follows: the SCW system is the best, followed by PRWFG system, and PRW system. It can be concluded that increasing the DPI is more beneficial to the thermal well with serious thermal breakthrough. Moreover, when the DPI is short, increasing the DPI can improve the temperature difference between outlet and inlet water and heat absorption quantities of PRW system significantly. When the DPI increases to a certain value, this improvement of thermal breakthrough is not significant. However, the PRWFG and SCW systems are different, i.e. increasing the DPI that benefits are always obvious. With the distance between the measuring point and thermal well increasing, the influence of thermal well on the measuring point is weaker. With the DPI increasing, the influence of the cold inlet water on the radial extent of the aquifer is weaker. The thermal influence scope of SCW system is the smallest one among the three types of thermal wells. Although there are some differences between the laboratory model tests and complexity of the practical geological conditions, the rules obtained from the experiments for the guidance of practical project still have great significance. |
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| Keywords: | pumps groundwater experiment single well sand tank distance between pumping and injection screens |
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