| The issue of energy has become one of the major problems related to production and life since the date of the birth of mankind.From ancient times to the present,human history has never been a lack of records of war because of the energy problem.Humans continue to use coal,oil,natural gas and other primary energy on the basis of ushered in the history of thousands of years of social prosperity and great development,but also brought the history of thousands of years without energy and the environment crisis.Since the end of the twentieth century,the depletion of energy and the serious consequences of energy abuse have forced countries around the world to change energy use policies,reduce energy use at the same time to develop clean and pollution-free renewable energy.Geothermal energy as a typical representative of clean and renewable energy,continuous research and development of new geothermal energy technology in line with China’s current "energy-saving emission reduction" of the big theme.Direct use of geothermal water and ground to ground source heat pump system is currently the most used geothermal energy utilization technology,but these two methods are obvious defects,we must focus on the study of a new geothermal energy utilization technology.Geothermal underground heat exchanger system to overcome the above two forms of geothermal energy defects,and both the advantages of both forms.Both to achieve the ground source heat pump heat does not take the advantages of water characteristics,and greatly improve the system’s heat transfer efficiency.At present,the most direct,efficient and cost-effective research method for geothermal underground heat exchangers is to simulate the convective heat transfer process of the geothermal underground heat exchanger by constructing a geothermal downhole heat exchanger simulation test bed.In the process Collecting data analysis and processing,and draw the relevant conclusions.In this paper,by setting up a set of geothermal underground heat exchanger simulation system,the system is similar to the operation and operation environment of geothermal underground heat exchanger in engineering practice.The variables that can be adjusted and controlled by this system have the types of simulated rock reservoirs,Simulating the caliberof the geothermal well,simulating the diameter of the copper tube of the heat exchanger,simulating the flow rate of the circulating water in the heat exchanger,simulating the strength of the flow field,simulating the whole temperature of the thermal storage,and making it possible to simulate the heat The actual operation of the various conditions.In the simulation experiment,the experimental method is used to change the experimental conditions,and the simulation data under various working conditions are collected.Then,the relevant details are improved through the data analysis and processing,and the optimal configuration type of the geothermal underground heat exchanger is obtained.Which greatly improves the heat transfer efficiency of the heat exchanger and provides a reference for the practical application of the project.At the same time,through the analysis of each influencing factor,the heat transfer experiment of the geothermal underground heat exchanger is finally obtained. |
