Study On The Suitability Evaluation Method And The Investigation And Evaluation Of The Typical Urban Buried Groundsource Heat Pump System

With the development of society,oil,coal and other non-renewable energy sources are depleting,shallow geothermal energy resources concern for people for its sustainable development,economic energy-saving,pollution-free,high efficiency At present,due to the lack of research on geothermal energy development and utilization in our country,and the lack of strict market system and fierce market competition,many cities blindly develop without scientific evidence.This not only caused serious waste to the local resources,but also greatly impeded the rational development of geothermal resources and the technical application of actual projects Therefore,it is necessary to conduct regional suitability analysis and differential identification research for reasonably develop geothermal resources.(1)The geological conditions,hydrogeological conditions,exploitation and utilization of shallow geothermal energy resources and geological environmental protection in the urban planning area of Xuzhou were analyzed and studied.Through the stratification study,the state of geothermal resource endowment in Xuzhou city was revealed.(2)On the basis of field test and indoor test,Fluent numerical simulation software is used to analyze the sensitivity of the factors affecting the suitability of the buried pipe in Xuzhou.Through further analysis,it is found that the thermal properties of rock and soil have little effect on the suitability of buried pipe compared with the cost of drilling,which shows that it is reasonable to use the suitable analysis method based on the cost of drilling as an evaluation index.(3)Relying on the research project of the task group,through the study of the endowment of geothermal resources in Xuzhou City and the screening of suitable evaluation methods,it was decided to use the DZ/T 0225-2009 as the basis for the"Assessment Code for shallow geothermal energy exploration".The suitability of geothermal energy resources in Xuzhou city was divided by single index comprehensive evaluation method,and the suitability of shallow geothermal energy resources and development in Xuzhou was investigated and evaluated by means of drilling cost evaluation method and single index evaluation method.Through the suitable partition of shallow geothermal energy development and utilization,it will provide a basis for planning and development of shallow geothermal energy in Xuzhou urban planning areaThe research results of this paper:1)Through the orthogonal test method to determine the simulation test plan,and then use the Fluent software to conduct 24-hour simulation analysis of various plans,it has been determined that the factors that affect the heat exchange of buried pipes in Xuzhou City are ranked from large to small.That is,the thermal diffusivity of the rock body,the inlet velocity,the backfill material,the depth of the buried pipe and the initial temperature;2)Through the comparison verification and simulation analysis,the rationality of adopting the suitable analysis method based on the cost of drilling is illustrated.3)The suitability of Xuzhou shallow geothermal energy division was carried out.The result is that the suitable area accounts for about 81%of the entire working area,which indicates that Xuzhou should be suitable for the heat transfer system of buried pipes.