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骆祖江,杜菁菁.基于热平衡分析的地埋管地源热泵换热方案模拟优化[J].农业工程学报,2018,34(13):246-254.DOI:10.11975/j.issn.1002-6819.2018.13.030
基于热平衡分析的地埋管地源热泵换热方案模拟优化
投稿时间:2018-02-27  修订日期:2018-05-31
中文关键词:  热泵系统  模型  热平衡  热堆积  浅层地热能
基金项目:中国地质调查局江苏省合作项目(12120114023101)
作者单位
骆祖江 河海大学地球科学与工程学院南京 211100 
杜菁菁 河海大学地球科学与工程学院南京 211100 
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中文摘要:为了确保丹阳中心城区浅层地热能可持续开发利用,避免丹阳中心城区地埋管地源热泵运行期间出现热堆积问题,基于地下水渗流和热量运移原理,建立了丹阳中心城区地下水非稳定渗流与热量运移三维耦合数值模型,结合未来地埋管地源热泵系统的运行工况,预测丹阳中心城区地下温度场的热平衡发展趋势。在此基础上,规划设计了3种优化方案:①按行政区划Ⅰ~Ⅴ个开发利用分区,调整地埋管间距分别为18,23,17,20,20 m;②地埋管间距5 m,加热秋季生活用水Ⅰ区157 798 m3/d、Ⅱ区413 235 m3/d、Ⅲ区339 322 m3/d、Ⅳ区261 266 m3/d、Ⅴ区27 6205 m3/d,加热春季生活用水Ⅰ区473 394 m3/d、Ⅱ区123 9705 m3/d、Ⅲ区1 017 966 m3/d、Ⅳ区783 798 m3/d、Ⅴ区828 615 m3/d;③地埋管间距5 m,增设冷却塔辅助地埋管换热孔进行夏季排热,冷却塔夏季冷却温度Ⅰ区为4.35 ℃、Ⅱ区为6.12 ℃、Ⅲ区为4.87 ℃、Ⅳ区为5.29 ℃、Ⅴ区为4.80 ℃。3种方案均可以有效减缓和避免丹阳中心城区地埋管地源热泵运行期内的热堆积问题。地下水非稳定渗流与热量运移三维耦合数值模型是优化确定浅层地热能地埋管地源热泵可持续开发利用方案的有效方法。
Luo Zujiang,Du Jingjing.Heat exchange scheme simulation optimization for ground source heat pump system with buried pipes by thermal equilibrium analysis[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(13):246-254.DOI:10.11975/j.issn.1002-6819.2018.13.030
Heat exchange scheme simulation optimization for ground source heat pump system with buried pipes by thermal equilibrium analysis
Author NameAffiliation
Luo Zujiang School of Earth Science and Engineering, Hohai University, Nanjing 211100, China 
Du Jingjing School of Earth Science and Engineering, Hohai University, Nanjing 211100, China 
Key words:heat pump systems  models  heat balance  heat accumulation  shallow geothermal energy
Abstract:Since the 21st century, the development and utilization of ground source heat pump in shallow geothermal energy is carried out in China successively. But it is still in its infancy, and there is a general lack of scientific design and planning, the problem of heat accumulation occurred in the process of application of ground source heat pump system, seriously affecting the sustainable development and utilization of shallow geothermal energy. In order to guarantee shallow geothermal energy sustainable development and utilization and avoid the problem of heat accumulation during the running period of ground-source heat pump in the downtown of Danyang, a three-dimensional coupled numerical model of groundwater unsteady seepage and heat transfer was established and applied to the demonstration project of the buried pipe heat pump system in Danyang, Jiangsu Province. The model was based on the principle of groundwater seepage and heat transport, combined with future ground-source heat pump system operating conditions, forecasting the thermal equilibrium development trend of underground temperature field. Three schemes were designed on this basis. Scheme 1 is to adjust heat transfer hole spacing. By simulation and calculation, we changed the minimum heat transfer 5 m hole spacing to 18, 23,17, 20, 20 m inⅠ-Ⅴarea respectively, and results showed that due to the increase of heat transfer hole spacing through mining buried pipe shallow geothermal energy for ten years, the rise in formation temperature decreased. Scheme 2 is to keep the heat exchange hole spacing constant, and heating spring and autumn living water. The total area of heating domestic water in study area was 173.23 km2, single hole heat exchange was calculated with 5% heat loss and heating water from 15 to 50 ℃. By the simulation and calculation, keeping 5 m transfer hole spacing, the heating water amount reach 1 447 826.19 m3/d in spring and autumn with the development and utilization of shallow geothermal energy. Mining 10 years, due to increasing heating water in spring and autumn, there is little increase in formation temperature during the year. The temperature of soil in winter, autumn and spring increases slowly, the problem of heat accumulation is alleviated. Scheme 3 is to keep the heat exchange hole spacing constant and add the cooling tower auxiliary heat exchange hole for summer heat discharge. The cooling tower is in accordance with the number of heat exchange holes in buried pipes and keeping 5 m transfer hole spacing, running 10 hours a day, let water through cooling towers of different cooling temperatures. Mining 10 years, the mixed heat transfer system with cooling tower and buried pipe can eliminate the heat accumulation caused by separate buried pipe system, ensure a good temperature recovery. Due to the limit of ground source heat pump engineering site, Scheme 1 can't be used, heating water in spring and autumn or adding cooling tower auxiliary heat exchange hole for summer heat discharge can be adopted in the actual project. The three-dimensional coupled numerical model of groundwater unsteady seepage and heat pump is an effective way to optimize and determine the sustainable development and utilization plan of ground source heat pump for shallow geothermal energy.
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