Performance analysis of a hybrid subway source heat pump system using capillary heat exchanger

被引：9
作者：
Mao, Zhu [1 ]
Hu, Songtao [1 ]
Guan, Yiming [1 ]
Ji, Yongming [1 ]
Liu, Guodan [1 ]
Tong, Zhen [1 ]
Wang, Yimei [1 ]
Tong, Li [1 ]
机构：
[1] Qingdao Univ Technol, Coll Environm & Municipal Engn, Qingdao 266033, Peoples R China
来源：
APPLIED THERMAL ENGINEERING | 2021年 / 197卷
关键词：
Hybrid subway source heat pump; Thermal imbalance; Capillary heat exchanger; TRNSYS simulation; Operation strategy; Energy-saving; UNDERGROUND THERMAL IMBALANCE; ENERGY; TUNNEL; SIMULATION; ENVIRONMENT;
D O I：
10.1016/j.applthermaleng.2021.117367
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A large amount of free heat generated by the running of subway is released to the tunnel. Due to arc structure of subway tunnels, conventional ground source heat pumps and large-diameter heat exchangers are difficult to efficiently extract the heat and maintain surrounding-rock thermal balance. To sustainably take advantage of these free heat, in this paper, a hybrid subway source heat pump system is proposed, which is integrated by subway source heat pump system, 4.3 mm diameter capillary heat exchanger and auxiliary cooling system. A dynamic simulation model of the hybrid heat pump system, which includes the heat transfer process between capillary heat exchanger and surrounding-rock was developed on TRNSYS. Field tests were conducted at a subway station of Qingdao (China) to validate this model. Under different strategies, the coefficient of performance of the hybrid heat pump system and characteristics of surrounding-rock temperature field are compared. The results indicated that the hybrid heat pump system can ensure appropriate surrounding-rock temperature without overheating (from 33.9 degrees C to 31.3 degrees C). Additionally, the coefficient of performance of the subway source heat pump units was 4.432, increased by 2.52%, the energy consumption of the subway source heat pump system can be decreased by 5.55%.
引用
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页数：11
相关论文
共 35 条
  • [1] Energy from earth-coupled structures, foundations, tunnels and sewers
    Adam, D.
    Markiewicz, R.
    [J]. GEOTECHNIQUE, 2009, 59 (03): : 229 - 236
  • [2] Underground railway environment in the UK Part 2: Investigation of heat load
    Ampofo, F
    Maidment, G
    Missenden, J
    [J]. APPLIED THERMAL ENGINEERING, 2004, 24 (5-6) : 633 - 645
  • [3] [Anonymous], 2009, 50366 GB
  • [4] Energy foundations and other thermo-active ground structures
    Brandl, H
    [J]. GEOTECHNIQUE, 2006, 56 (02): : 81 - 122
  • [5] Multicriteria performance investigations of a hybrid ground source heat pump system integrated with concentrated photovoltaic thermal solar collectors
    Chen, Yuzhu
    Wang, Jiangjiang
    Ma, Chaofan
    Shi, Guohua
    [J]. ENERGY CONVERSION AND MANAGEMENT, 2019, 197
  • [6] An analysis of solar assisted ground source heat pumps in cold climates
    Emmi, Giuseppe
    Zarrella, Angelo
    De Carli, Michele
    Galgaro, Antonio
    [J]. ENERGY CONVERSION AND MANAGEMENT, 2015, 106 : 660 - 675
  • [7] Dynamic thermal simulation of horizontal ground heat exchangers for renewable heating and ventilation of buildings
    Gan, Guohui
    [J]. RENEWABLE ENERGY, 2017, 103 : 361 - 371
  • [8] Hybrid absorption-compression heat pump with two-stage rectification and subcooler
    Gao, Peng
    Qing, Chun
    Chang, Meng-Meng
    Shao, Liang-Liang
    Zhang, Chun-Lu
    [J]. APPLIED THERMAL ENGINEERING, 2020, 181
  • [9] Gao Y, 2017, RES SIMULATION OPERA
  • [10] A predictive TRNSYS model for long-term operation of a hybrid ground source heat pump system with innovative horizontal buried pipe type
    Hou, Gaoyang
    Taherian, Hessam
    Li, Longjun
    [J]. RENEWABLE ENERGY, 2020, 151 : 1046 - 1054
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