Thermo-Economic Analysis for Exploitation of Geothermal Energy Using Super-Long Gravity Heat Pipe with Heat Pump
The reserves of deep geothermal resources are enormous.An effective method for exploiting deep geothermal resources involves extracting them using a super-long gravity heat pipe combined with a heat pump system to provide heat for consumers.In response to the issue of how to adjust the combined operation of super-long gravity heat pipe and heat pump under different parameters to achieve optimal thermo-economic performance,this study develops a thermo-economic system model.It investigates the changes in thermo-economic performance under different evaporation temperatures,super-long gravity heat pipe thermal resistances,well depths,geothermal gradients,and evaporator areas of the heat pump system.The results indicate that there is an optimal evaporation temperature that minimizes the cost of heating.For instance,under a geothermal gradient of 30℃/km and a well depth of 3 000 m,the optimal evaporation temperature is-2℃.When the thermal resistance of the super-long gravity heat pipe is smaller or the geothermal gradient is larger,the heating cost is lower and the optimal evaporation temperature is higher.Additionally,there is an optimal well depth and evaporator area that minimize heating costs.These findings provide theoretical guidance for optimizing the integration of super-long gravity heat pipe and heat pump system in deep geothermal extraction.
deep geothermal extractionsuper-long gravity heat pipeheat pump systemgeothermal energy utilizationthermo-economic analysis
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