Design optimization of integrated energy system using liquid flow battery and heating and cooling storage energy system

doi:10.19799/j.cnki.2095-4239.2022.0674

Abstract

Abstract:

A comprehensive energy system was developed for a large office building in north China using a photovoltaic power generator, an iron-chromium liquid flow battery, a heat pump, and water energy storage. The annual hourly energy consumption and benefit analysis of the energy system are conducted by compiling calculation programs, optimizing algorithms, and other processing methods. Economic indicators, such as the initial investment, annual energy consumption, operating cost, energy conservation rate, and life cycle cost (LCC), are used to evaluate the system's economics and design. The results indicate that the multiple energy source system has better energy conservation and economics. The optimized storage tank volume is 920 m³ with 14 heat pumps and an LCC of 13.4708 million yuan. The iron-chromium liquid flow battery stored power and heat, while the water energy storage system was used for heating and cooling storage, resulting in an annual average photovoltaic power consumption of 65.3%. At this cooling and heating load supply level, an energy storage supply of more than 67% was achieved from the total cooling and heating energy supply, of which 100% was acquired in March, September, and November.

Key words: liquid flow battery, comprehensive energy, energy storage, benefit analysis

CLC Number:

TK 01

Xin ZHENG, Hao YU, Xiaoyu GUO, Ying ZHOU, Yuanjie ZUO, Yujia LIU. Design optimization of integrated energy system using liquid flow battery and heating and cooling storage energy system[J]. Energy Storage Science and Technology, 2023, 12(3): 870-877.

Figures/Tables 12

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序号	设备名称	性能参数	台套数
1	电极锅炉	Q_H=2蒸吨	1
2	冷水机组	Q_L=1000 kW	2
3	电热水器	P=50 kW	1
4	循环水泵	Q=100 m³/h，H=32 m	3
5	冷却塔系统	1300 kW	1
6	光伏	5 MW	1
7	铁-铬液流储能	250 kW/1.5 MWh	1

标况下性能参数	数值/kW
制冷量	100
制热量	103
制冷功率	33.9
制热功率	31.5

方案	常规方案	热泵储能耦合方案
空气源热泵台数	—	20	13	14	16	20	25
水储能储罐容积/m³	—	0	800	920	1040	1160	1300
初投资/万元	174.4	202	268	298	338	400	472
运行能耗/kW	2613775	1758402	1594619	1532037	1501454	1395480	1321160
运行成本/(万元/年)	209.10	140.67	127.57	122.56	120.12	111.64	105.69
节能率/%	—	32.7%	39.0%	41.4%	42.6%	46.6%	49.5%
回收期	—	0.40	1.15	1.43	1.84	2.31	2.88
LCC/万元	1964.20	1406.08	1359.93	1347.08	1366.13	1355.57	1376.68

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