Abstract
This study presents a distributed integrated energy system driven by deep and shallow geothermal energy based on forward and reverse cycle for flexible generation of cold, heat and electricity in different scenarios. By adjusting the strategy, the system can meet the demand of heat-electricity in winter, cool-electricity in summer and electricity in transition seasons. The thermodynamic analysis shows that the thermal efficiency of the integrated energy system in the heating and power generation mode is 16% higher than that in the cooling and power generation mode or the single power generation mode. Meanwhile, the annual heat-obtaining quantity of the system is reduced by 11% compared with that of the independent power generation system, which effectively alleviates the imbalance of the temperature field of the shallow geothermal reservoir. In terms of net power generation, the integrated energy system can generate approximately 31% more electricity than the conventional independent cooling and heating system under the same cooling and heating capacity. An integrated system not only realizes the comprehensive supply of cold and thermal ower by using clean geothermal efficiency, but also solves the temperature imbalance caused by the attenuation of a shallow geothermal temperature field. It provides a feasible way for carbon emission reduction to realize sustainable and efficient utilization of geothermal energy.
Highlights
Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
The distributed integrated energy systems utilize geothermal energy in deep and 4 of shallow layers to achieve the function of cooling, heating and power supply
In view of the sustainable characteristics of geothermal energy and the conformation the distributed integrated geothermal systems to the principle of energy cascade utilization of the distributed integrated geothermal systems to the principle of energy cascade utiand temperature matching, the regional energy station based on a distributed integrated lization and temperature matching, the regional energy station based on a distributed energy system driven by deep and shallow geothermal energy is expected to become integrated energy system driven by deep and shallow geothermal energy is expected to one of the alternative paths for the carbon emission reduction
Summary
With the rapid growth of global total energy consumption, global warming, ecological deterioration, and the mismatch of energy supply and demand for consumers are becoming increasingly acute [1,2] In this context, adjustment of energy structure, utilization of renewable energies and improvement of energy efficiency are considered effective approaches for resolving the energy and environmental challenges [3]. As the medium-low temperature geothermal resources are the largest reserves and are the most widely distributed geothermal energy forms [11], organic rankine cycle (ORC)-based power generation, as an effective way to utilize the medium-low temperature thermal energy, has become a current research hotspot in the field of geothermal energy utilization [12,13].
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