An Comparative Analysis Of Hot Dry Rock Heat Exchange Methods

Energy is the material basis for the human survival and economic development. Along with the rapid development of society, sustainable development has become the world attention important questions.The problem of energy resources and environmental problems and sustainable development strategy of the most important and the most key link. People rely on for a long time of conventional energy sources, such as coal, oil, natural gas are one-off energy, unsustainable. As human development and utilization of unceasingly, will eventually dry up, and when using the conventional energy inevitably great pollution to the human survival environment.Since the discovery of geothermal energy, geothermal energy, especially the mainstream way of the experimental study of dry heat energy research and development mainly divided into two categories. European countries represented by America and Australia mainly take an injection into the well working fluid (usually water), a liquid extraction work out Wells of two well type. Represented by Japan mainly take two or more than two into the water well injection liquid (usually water), at the center of the retention layer to drill a well how well type. Based on the western way of two well type work and more than Japan's well type works as the goal, modeling, respectively, after comparing simulation, under same conditions. In the same condition, the two well type and multiple well type of advantages and disadvantages for the methods of heat transfer, efficiency research. To guide the hot diy rock resources development and utilization of shenyang.In this paper, based on Fluent simulation software platform, the use of modeling modeling ideas, by GAMBIT program to set the model geometry. In order to make the results more accurate, the hexagonal cells fill the generated grid. This model assumes that the working fluid is incompressible, the speed of the fluid is known and constant, inlet and outlet is v= 2w/s for all the time. Work for hot dry rock accurately performance system, the operation of the heat retention layer features, this paper adopted the Fluent simulation software based on the pressure of the coupled solver. In order to better compare under the same conditions, more than two well type retention layer and well type retention layer, working characteristics, set up two boundary conditions exactly the same column model, filling materials, heat exchange system is the main way to distinguish between different currents. Under constant water flow speed, simulated operation and get the model from the system started to run to the water temperature stable time each time point in the system of the water temperature distribution contours of each part. In order to draw two operation characteristics of the model. At the same time, the horizontal contrast in both emissivity in thermal efficiency, heat transfer speed, water flow and water temperature, etc.Finally, based on the simulation scheme of different work modes of hot dry rock energy retention layer heat transfer heat transfer research, qualitative analysis. By extracting system stable moment out of the well water temperature data, to make the heat exchange performance evaluation system. Obtained under different ways of heat exchange, the working characteristic of hot dry rock retention layer. Further verify the effectiveness of the multiple well heat exchange system heat transfer efficiency and low water permeability, double well type of economy and convenience.