【作者】 王斌；

【导师】 李晓昭；

【作者基本信息】 南京大学 ， 地质工程（专业学位）， 2017， 硕士

【摘要】 浅层地温能作为21世纪的可持续发展的能源,具有和太阳能、风能相媲美的利用价值,近年来在国内外得到越来越广泛地使用。地埋管的换热性能对于热泵系统的效率起着决定性的作用,常采用热响应测试指导地埋管管长设计,热响应测试主要获得岩土体热物性参数,因此岩土体热物性参数结果间接影响了地源热泵系统。正确有效的指导地埋管的设计,可以节约钻孔成本。本文对国内外热响应测试技术和测试仪器进行了分析研究,并自主研发了地层热响应分层测试仪器,其优势在于:(1)在线热源理论的基础上推导了分层热物性应用模型,并利用该模型在试验区现场验证了热响应测试仪器的性能。(2)该仪器除能实现温度、流量、功率等基本参数的精准化测试,还加入了分层测温设备,实现了两者的集成化。并加入远程监控和传输系统,在试验现场无人值守时出现故障通过短信告知实验人员,并且可以把监测数据远程传输至终端。(3)地层热响应分层测试仪器可以监测地埋管换热器各层温度变化,据此可以计算分层导热系数、分层换热量,且可以用来分析间歇性运行岩土体的换热能力。本文依托徐州某工程场地,采用实测和数值模拟的方法对地埋管换热器展开研究,基于线热源理论得出地层热物性分层应用模型,并利用自主研发的地层热响应分层测试仪器进行测试,针对分层测试仪器和分布式光纤现场数据比较得到分层测试仪器可以较好的应用在分层测温上,并实测发现改变加热功率对分层导热系数的影响较小,提高进水温度可以显著提高各深度岩土体的换热量。通过数值模拟与实测结果进行对比证明了该分层测试方法的合理性,根据不同埋管深度得到的换热量与钻进成本进行比较发现,存在理想换热地层与理想换热器埋深。因此通过热响应分层测试更能有效指导地埋管换热器管长设计,以期节省钻孔成本。更多还原

【Abstract】 Shallow geothermal energy can be used as a sustainable energy for the 21st century,it comparable to the use of value of solar energy,wind energy.In recent years have been more widely used at home and abroad.The heat transfer performance of the ground heat exchanger in the ground source heat pump technology plays a decisive role in the efficiency of the ground source heat pump system,often used thermal response test to carry out the design of the buried heat exchanger.The thermal response test is mainly to obtain the soil thermophysical parameters,so the accurate access to soil thermophysical parameters indirectly affects the ground source heat pump system.In this paper,domestic and foreign thermal response testing technology and thermal response equipment were analyzed,Independent research and development of the stratigraphic thermal response stratification test equipment its advantage lies in:(1)On the basis of the theory of online heat source,the application model of stratified thermophysical parameters is deduced,and the model was used to verify the performance of the thermal response test instrument at the test area.(2)The instrument in addition to achieve the temperature,flow,power and other basic parameters of the precision test,also joined the stratified temperature measurement equipment,to achieve the integration.And joined the remote monitoring and transmission system,in the test site unattended failure through the text message to inform the experimental staff,and can remotely transmit the monitoring data to the terminal.(3)Stratigraphic thermal response stratification test equipment can monitor the temperature of each floor of the buried pipe,can be calculated stratified thermal conductivity,stratified per meter heat transfer.And can be used to analyze the intermittent running soil heat transfer capacity.For the temperature measurement cable and fiber field data obtained by the temperature measurement cable can be better applied in the stratified temperature,and found that changing the heating power has little effect on the stratified thermal conductivity,increasing the influent temperature can significantly improve the heat transfer of rock and soil at each depth.The rationality of the stratified test method is proved by comparing the numerical simulation with the measured results,According to the different depth of the pipe to get the heat transfer and drilling costs were found,existence of ideal heat transfer formation and ideal heat exchanger depth.Therefore,through the thermal response stratification test more effective guide to the design of the buried pipe heat exchanger tube length,in order to save drilling costs.更多还原