Volume 01: Proceedings of Applied Energy Symposium: MIT A+B, United States, 2019

Investigation on Geothermal Water Reservoir Development and Utilization by Variable Temperature Regulation: A Case Study of China Hui Xie, Luyi Zhang, Ruifei Wang, Hongqing Song, Huifang Fan, Li Du, Pengguang Sun

Abstract

Geothermal heating technology is critical in urban sustainable development and climate change mitigation. This research paper conducts a numerical simulation and multi-objective optimisation for geothermal heating systems based on factors such as ground demand, profitability regulation modes, and region areas. It’s indicated that well spacing and production rate are the two main factors affecting production performance as well as emission reduction efficiency of geothermal heating systems. The heating mode also plays a vital role in the utilization of geothermal reservoirs. There is a delay in the formation time of thermal breakthroughs of the regulated geothermal heating system. The radius of the cold front shrinks, while production performance and emission reduction efficiency also decrease. Comparing the regulated geothermal heating system to the unregulated geothermal heating system, the construction investment of geothermal wells and the annual water consumption both decrease by up to 30% and 60%, respectively. Additionally, electricity costs increase by 5% to 25%. The regulated geothermal heating system with well spacing of 300m and production rate of 100m3/h generates the highest efficiencies in terms of heat production, emission reduction, and economic performance, all of which are most suitable for this project in Qingfeng. The simulation method and optimisation model of this research paper can be extended to other regions.

Keywords Justice; feed-in tariff; Photovoltaic Poverty; Alleviation Projects; subsidy; provincial

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