基于热平衡原理的地埋管地源热泵系统开发利用规划评价

Development and Utilization Planning Evaluation of Ground Source Heat Pump System Based on Heat Balance Principle

为了保障海门地区地埋管地源热泵系统的可持续开发利用,科学合理设计地埋管地源热泵系统布置方案,准确评价系统的浅层地热能可采资源量,根据研究区水文地质和浅层地热地质条件,基于热平衡原理,建立了海门地区地埋管地源热泵系统水-热三维耦合数值模型,预测分析了未来地源热泵系统运行期间不同布置方案下浅层土体温度场的动态变化规律。通过对比分析,针对出现的热堆积问题,确定了克服土体热堆积的地埋管优化布置方案,评价了研究区地埋管地源热泵系统的浅层地热能可采资源量。结果表明,海门地区地埋管地源热泵系统开发可分为6个区,各区地埋管间距在29~39m,能够保证未来运行10a内土体温度升幅不超过0.5℃,地热能可持续开采。在此方案下,研究区地埋管地源热泵系统可采资源潜力夏季为3.851157×10^(4)m^(2)/km^(2),冬季为7.586812×10^(4)m^(2)/km^(2)。

In order to ensure the sustainable development and utilization of the ground source heat pump system in the Haimen area,scientifically and reasonably design the layout plan of the buried pipe ground source heat pump system,accurately evaluate the extractable shallow geothermal energy resources of the system,based on the hydrogeological and shallow geothermal geological conditions of the research area,and based on the principle of thermal balance,a three-dimensional numerical model of water-heat coupling for ground source heat pump system in the Haimen area was established.The dynamic changes in the temperature field of shallow soil under different layout schemes during the operation of future ground source heat pump systems were predicted and analyzed.Through comparative analysis,an optimized layout plan for buried pipes was determined to overcome the problem of thermal accumulation in soil.The shallow geothermal energy recoverable resources of ground source heat pump system in the research area were evaluated.The results show that the development of ground source heat pump systems in the Haimen area can be divided into 6 zones,with a spacing of 29~39m between buried pipes in each zone.This can ensure that the soil temperature rise does not exceed 0.5℃within the next 10 years of operation,and the sustainable exploitation of geothermal energy.Under this plan,the exploitable resource potential of the buried pipe ground source heat pump system in the research area is 3.851157×10^(4)m^(2)/km^(2) in summer,and 7.586812×10^(4)m^(2)/km^(2)in winter.