Status quo and prospects of geothermal energy in heat supply

doi:10.3969/j.issn.1674-1951.2021.11.003

Abstract

Abstract:

The energy consumption in construction industry stays high.In 2019,global carbon emissions from construction industry accounted for 28% of the total CO₂ emissions.Nowadays,energy conservation and emission reduction for buildings has become a major problem for energy structure of China and even the world.In order to explore the heating potential of geothermal resources and its value in achieving emission peak and carbon neutrality,the endowment and distribution characteristics of geothermal resources in China is briefly described and the geothermal energy utilization modes suitable for different regions are obtained.Energy-saving and high-efficiency pipe burying ways for ground source heat pumps（GSHPs）have drawn great attention.Based on engineering cases,different heat-supply characteristics of shallow and medium-deep geothermal energy have been analyzed.According to the development in the past five years,the GSHP is of great development potential for being able to meet 19.25% of China's building energy supply demand by 2030. In terms of practical application and prospects,a variety of new underground heat exchangers,direct-expansion GSHPs,cross-season energy storage and multi-energy complementary geothermal energy utilization modes are proposed by considering the geothermal detection,geothermal extraction and geothermal utilization.These technologies can increase the utilization rate of renewable energy,reduce the fossil energy consumption and lower the energy consumption of buildings.

Key words: geothermal energy, ground source heat pump, energy supply for buildings, engineering application, carbon emissions, carbon peaking and carbon neutrality, multi-energy complementary, heating

CLC Number:

TK01

WANG Guiling, YANG Xuan, MA Ling, ZHOU Jiaqi, SHEN Guohua, WANG Wanli. Status quo and prospects of geothermal energy in heat supply[J]. Huadian Technology, 2021, 43(11): 15-24.

Figures/Tables 8

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名称及位置	埋管类型	供暖/供冷面积/万m²	制热/制冷量/kW	年份
天津首个地源热泵工程：梅江生态小区办公楼	桩埋管+垂直埋管+水平埋管	0.37	—	2001
北京首个基岩地源热泵工程：天湖国际会议酒店^[31]	垂直埋管（218 m×120 m）	4.00	—	2004
中国早期大型地源热泵+冰蓄冷项目：北京九华山庄^[32,33]	垂直埋管（700 m×100 m）	13.00	10 500.0/13 000.0	2005
中国早期大型地埋管地源热泵工程：北京用友软件园^[34]	双U型埋管（616 m×120 m）	18.50	13 400.0/15 800.0	2007
地源热泵助力绿色奥运：国家体育场^[35,36]	垂直埋管（312 m×70 m）	—	1 800.0/1 500.0	2008
地源热泵助力上海世博会：世博轴^[37,38]	W型桩埋管	25.00	—	2010
地源热泵助力绿色校园：天津大学北洋园校区^[39]	垂直埋管	38.44/28.01	13 569.8/18 304.4	2015
中国最大的多能互补地源热泵工程：北京大兴国际机场^[40]	垂直埋管	100.00	54 200.0/48 800.0	2019