Study on the solar-assisted ground-source heat pump system with seasonal heat storage in cold regions

doi:10.3969/j.issn.2097-0706.2023.04.008

Abstract

Abstract:

In view of the soil heat imbalance caused by the manifested gap between higher cooling load in summer and lower heating load in winter in cold regions，TRNSYS simulation software was selected to analyze the performance of a solar-assisted ground-source heat pump（SAGSHP）system with seasonal heat storage in a hospital in Baotou City.The analysis results show that the soil temperature has increased from 10.00 ℃ to 10.68 ℃ after 10-year operation of the seasonal heat storage system，while the soil temperature has decreased by 5.62 ℃ after 10-year operation of a solar energy coupled ground source heat pump （SGSHP）system.The COP of the SAGSHP system taking seasonal heat storage was 3.25，up 2.20% year on year，and its EER was 7.55，up 0.13% year on year.At the same time， the total power consumption of the SAGSHP system taking seasonal heat storage is reduced by 11.54% compared with that of the SGSHP system.It can be seen that SAGSHP systems taking seasonal heat storage mode can not only improve the heating performance coefficient of soil source heat pumps，but also alleviate the soil heat imbalance and save the power consumption of the whole system.

Key words: solar energy, solar-assisted ground-source heat pump with seasonal heat storage, solar-ground source heat pump, TRNSYS, cross-season heat storage, ground source heat pump

CLC Number:

TK52

DOU Zihui, LIU Jingxia, LI Baoli. Study on the solar-assisted ground-source heat pump system with seasonal heat storage in cold regions[J]. Integrated Intelligent Energy, 2023, 45(4): 52-58.

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References 26

[1]	陈萨如拉. 跨季节埋管蓄热系统不同运行模式下的热特性研究[D]. 天津: 天津大学, 2019.
	CHEN Sarula. Thermal characteristics study of seasonal borehole thermal energy storage(BTES) system under different operating modes[D]. Tianjin:Tianjin University, 2019.
[2]	张怡, 房方. 基于随机模型预测控制的智能楼宇能量管理方法[J]. 综合智慧能源, 2022, 44(10):83-90. doi: 10.3969/j.issn.2097-0706.2022.10.011
	ZHANG Yi, FANG Fang.Smart building energy management strategy based on stochastic model predictive control[J]. Integrated Intelligent Energy, 2022, 44(10):83-90. doi: 10.3969/j.issn.2097-0706.2022.10.011
[3]	郑刚, 李金刚, 刘依婷. 基于建筑综合物性系数的换热站运行调节策略分析[J]. 华电技术, 2021, 43(12):72-78.
	ZHENG Gang, LI Jingang, LIU Yiting. Analysis on operation regulation strategy for heat exchange stations based on building comprehensive physical property coefficients[J]. Huadian Technology, 2021, 43(12):72-78.
[4]	江婷, 赵雅姣. 基于燃气分布式的综合能源系统碳减排分析[J]. 综合智慧能源, 2022, 44(9):27-32. doi: 10.3969/j.issn.2097-0706.2022.09.004
	JIANG Ting, ZHAO Yajiao. Carbon emission reduction analysis for gas-based distributed integrated energy systems[J]. Integrated Intelligent Energy, 2022, 44(9):27-32. doi: 10.3969/j.issn.2097-0706.2022.09.004
[5]	王长君, 刘硕, 丁薛峰. 相变储能技术在清洁供暖中的应用研究[J]. 华电技术, 2020, 42(11):91-96.
	WANG Changjun, LIU Shuo, DING Xuefeng. The study on application of phase change energy storage technology in clean heating[J]. Huadian Technology, 2020, 42(11):91-96.
[6]	赵斌, 卢大为, 刘维安, 等. 高寒高海拔地区太阳能集中供暖技术及其应用[J]. 华电技术, 2020, 42(11):51-55.
	ZHAO Bin, LU Dawei, LIU Weian, et al. Technology and application of solar central heating in extremely cold and high-altitude areas[J]. Huadian Technology, 2020, 42(11):51-55.
[7]	徐恒志, 周博文, 李广地, 等. 含水源热泵的区域综合能源系统低碳运行优化研究[J]. 综合智慧能源, 2022, 44(1):39-48. doi: 10.3969/j.issn.2097-0706.2022.01.006
	XU Hengzhi, ZHOU Bowen, LI Guangdi, et al. Research on optimal operation of the regional integrated energy system with water-source heat pumps[J]. Integrated Intelligent Energy, 2022, 44(1):39-48. doi: 10.3969/j.issn.2097-0706.2022.01.006
[8]	MOHAMMADI M, NOOROLLAHI Y, MOHAMMADI-IVATLOO B, et al. Energy hub:From a model to a concept——A review[J]. Renewable and Sustainable Energy Reviews, 2017, 80:1512-1527. doi: 10.1016/j.rser.2017.07.030
[9]	BOUHACINA B, SAIM R, BENZENINE H, et al. Analysis of thermal and dynamic comportment of a geothermal vertical U-tube heat exchanger[J]. Energy and Buildings, 2013, 58:37-43. doi: 10.1016/j.enbuild.2012.11.037
[10]	LI B, HAN Z, BAI C, et al. The influence of soil thermal properties on the operation performance on ground source heat pump system[J]. Renewable Energy, 2019, 141:903-913. doi: 10.1016/j.renene.2019.04.069
[11]	季永明, 端木琳. 太阳能辅助地埋管地源热泵复合系统过渡季运行模式[J]. 暖通空调, 2017, 47(10):127-131.
	JI Yongming, DUANMU Lin. Operation modes of solar-assisted ground-source heat pump system in transition season[J]. Heating Ventilating & Air Conditioning, 2017, 47(10):127-131.
[12]	YANG Weibo, SUN Lulu, CHEN Yongping. Experimental investigations of the performance of a solar-ground source heat pump system operated in heating modes[J]. Energy & Buildings, 2015, 89:97-111.
[13]	WANG X, CUI P, ZHANG W, et al. Optimal design methods and experimental validation for hybrid ground source heat pump system with gas boiler[J]. Procedia Engineering, 2017, 205:4149-4156. doi: 10.1016/j.proeng.2017.10.159
[14]	YANG W, ZHANG H, LIANG X. Experimental performance evaluation and parametric study of a solar-ground source heat pump system operated in heating modes[J]. Energy, 2018, 149:173-189. doi: 10.1016/j.energy.2018.02.043
[15]	金光, 陈正浩, 郭少朋, 等. 内蒙古地区太阳能-地源热泵系统供暖可行性研究[J]. 太阳能学报, 2021, 42(4):334-341.
	JIN Guang, CHEN Zhenghao, GUO Shaopeng, et al. Feasibility analysis of heating with solar energy-ground source heat pump system in Inner Mongolian areas[J]. Acta Energiae Solaris Sinica, 2021, 42(4):334-341.
[16]	冯国会, 张磊, 常莎莎, 等. 严寒地区太阳能跨季节蓄热-地源热泵耦合系统性能研究[J]. 暖通空调, 2021, 51(S1):202-206.
[17]	CIMMINO M, ESLAMI-EJAD P. A simulation model for solar assisted shallow ground heat exchangers in series arrangement[J]. Energy and Buildings, 2017, 157:227-246. doi: 10.1016/j.enbuild.2016.03.019
[18]	RAZAVI S H, AHMADI R, ZAHEDI A. Modeling simulation and dynamic control of solar assisted ground source heat pump to provide heating load and DHW[J]. Applied Thermal Engineering, 2018, 129:127-144. doi: 10.1016/j.applthermaleng.2017.10.003
[19]	公共建筑节能设计标准:GB 50189—2015[S].
[20]	严寒和寒冷地区居住建筑节能设计标准:JGJ 26—2010[S].
[21]	地源热泵系统工程技术规范:GB 50366—2005[S].
[22]	中国建筑科学研究院. 太阳能集中热水系统选用与安装[M]. 北京: 中国计划出版社, 2006.
[23]	太阳能供暖釆暖工程技术规范:GB 50495—2009[S].
[24]	李双双. 寒冷地区跨季节蓄热型太阳能耦合地源热泵系统的优化设计[D]. 天津: 天津大学, 2020.
	LI Shuangshuang. Optimal design of a solar assisted ground source heat pump system with seasonal thermal energy storage in cold area[D]. Tianjin:Tianjin University, 2020.
[25]	民用建筑太阳能热水系统应用技术标准:GB 50364—2018[S].
[26]	可再生能源建筑应用工程评价标准:GB/T 50801—2013[S].

建筑	外墙传热系数	屋顶传热系数	楼地热阻/(m²·K·W^-1）	外窗传热系数	外窗太阳得热系数
发热门诊	1.11	0.61	1.12	2.60	0.53
门诊楼	1.11	0.61	1.12	2.60	0.53
住院部	0.32	0.28	1.54	2.10	0.53

建筑	人员密度/ (人·m^-2)	设备功率密度/ (W·m^-2)	照明功率密度/ (W·m^-2)
发热门诊	0.125	20	8
门诊楼	0.125	20	8
住院部	0.040	15	6

月份	发热门诊	门诊部	住院部	总负荷
1	15 435.72	33 037.02	25 161.79	73 634.52
2	13 724.64	28 637.94	21 643.92	64 006.50
3	9 714.85	18 154.89	10 888.64	38 758.38
4	2 603.74	3 857.63	1 349.62	7 810.66
5	70.15	491.04	2 594.62	3 155.81
6	556.82	1 518.73	8 083.29	10 158.84
7	719.11	2 946.54	7 997.68	11 663.32
8	215.10	516.32	5 826.53	6 557.95
9	0.00	0.00	0.00	0.00
10	2 604.61	2 979.81	516.25	6 100.67
11	10 133.81	20 251.61	12 866.01	43 251.43
12	15 767.38	31 685.45	24 768.81	72 221.64

部件名称	型号	具体参数
太阳能集热器	Type1b	平板型集热器,集热面积345.00 m²
蓄热水箱	Type158	水箱容积35 m³,水箱分为6层，每层高度为0.5 m,水箱热损失系数0.4
土壤源热泵机组	Type216	额定制热/冷量250.00 kW,制热功率71.43 kW,制冷功率50.20 kW
地埋管换热器	Type557	孔数量51,孔深150.0 m,管内流量1.15 m³/h,埋管顶部距地面的距离为2.0 m，钻井间距为5.0 m，钻井半径120 mm，埋管外径32 mm，埋管内径26 mm
板式换热器	Type91	设计换热量74.04 kW,换热面积4.23 m²
集热泵	Type114	集热泵流量24.13 m³/h,扬程20.0 m,功率1.75 kW
合流器	Type11h	控制模式为1
分流器	Type11f	控制模式为2
土壤源侧水泵-采暖	Type114	流量43.84 m³/h,扬程20.0 m,功率1.78 kW,供回水温差3.5 ℃
温差控制器	Type165	根据实际需求设置温差控制上限和下限
气象参数	Type15-3	包头地区典型气象年数据

系统	C_OP	C_OP,sys	E_ER	E_ER,sys
SGSHP	3.18	3.26	7.54	4.96
SAGSHP	3.25	3.24	7.55	4.97