Benefit study of peak shaving energy systems using geothermal energy with storage in office buildings

doi:10.19799/j.cnki.2095-4239.2019.0285

Abstract

Abstract:

Geothermal regions have excellent application prospects as low-carbon, green energy sources. Geothermal energy-storage systems combine geothermal- and thermal-storage technologies, thereby improving the single-well heating ability, expanding the recharge quantity of single wells, and reducing the running costs. To meet the heating demands of office buildings in Hebei Province (Northern China), this study proposes a peak shaving energy system based on geothermal energy. The economics of the system are evaluated in terms of several economic indicators such as initial investment, operating cost, and net present value. Besides conserving energy, the geothermal energy system with thermal storage reduced the initial investment and operating costs by 42% and 55% from those of the geothermal system without the storage. The net annual value of the proposed system was ￥14392.10.

Key words: geothermal energy, energy storage, recharge quantity, benefit study

CLC Number:

TU 832

ZHENG Xin, SUN Yuxiao, ZHANG Di, ZHOU Gaoxin, LI Jing, WANG Xuwei, ZHANG Xiaozheng, ZHANG Jinlong. Benefit study of peak shaving energy systems using geothermal energy with storage in office buildings[J]. Energy Storage Science and Technology, 2020, 9(3): 720-724.

Figures/Tables 8

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统计参数	单位	数据
建筑面积	m²	94000
全年最大热负荷	kW	6329
全年累计热负荷	kW·h	7338456.76
全年最大热负荷指标	W/m²	67.33

时刻	小时数	平均差额负荷/kW
7:00	61	539
8:00	52	491
9:00	34	513
10:00	24	464
11:00	17	382
12:00	9	443
13:00	6	422
14:00	4	464
15:00	4	374
16:00	4	392
17:00	5	385
18:00	7	381
19:00	8	456
20:00	10	474
21:00	14	438

方案	类别	单价/万元	数量	合价/万元
地热+燃气总计	设备购置费（3蒸吨燃气锅炉系统）	42	1	42
	建安工程费	8	1	8
				50
潮汐式地热总计	设备购置费（潮汐式储能系统）	17	1	17
	建安工程费	12	1	12
				29

类别	电度电价/元·(kW·h)^-1
类别	平段	尖峰	高峰	低谷
商业	0.6631	1.0445	0.9147	0.4088

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