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Investigation on the optimal cooling tower input capacity of a cooling tower assisted ground source heat pump system

机译：冷却塔辅助地源热泵系统最佳冷却塔输入量的研究

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摘要

Coupling auxiliary cooling devices with ground source heat pump (GSHP) systems in cooling dominated areas can effectively solve the ground thermal imbalance problem. However, the input capacity of the auxiliary heat rejecter directly affects the performance of such hybrid ground source heat pump (HGSHP) systems. This paper presents an investigation on the optimal cooling tower input capacity of a cooling tower assisted GSHP system through both experiments and simulations. The experiments were carried out based on a HGSHP system implemented in an office building and the experimental results were used to validate a numerical model. A simulation system of the cooling tower assisted GSHP system was then developed using TRNSYS and validated against the experimental data collected. The impacts of the cooling tower input capacity on the soil temperature and the system performance were simulated. The results showed that the soil heat accumulation could be effectively alleviated when the cooling tower input capacity ratio (CTICR) was greater than 50%. The optimal cooling tower input capacity was highly dependent on the operation scenario used. The optimal CTICR under two operation scenarios considered was around 54%, while that under the other operation scenarios was around 63%. The control strategy based on the fixed temperature difference between the cooling water leaving the heat pump and the ambient air dry-bulb temperature was found to be the optimal control strategy for the system studied. (C) 2018 Elsevier B.V. All rights reserved.
机译：在冷却占主导地位的区域中，将辅助冷却装置与地源热泵（GSHP）系统耦合可以有效解决地热不平衡问题。但是，辅助排热器的输入容量直接影响这种混合地面源热泵（HGSHP）系统的性能。本文通过实验和仿真，对冷却塔辅助GSHP系统的最佳冷却塔输入容量进行了研究。实验是基于在办公大楼中使用的HGSHP系统进行的，实验结果用于验证数值模型。然后，使用TRNSYS开发了冷却塔辅助GSHP系统的仿真系统，并针对收集的实验数据进行了验证。模拟了冷却塔输入容量对土壤温度和系统性能的影响。结果表明，当冷却塔输入风量比（CTICR）大于50％时，土壤热量蓄积可以得到有效缓解。最佳的冷却塔输入容量在很大程度上取决于所使用的操作方案。在考虑的两个操作方案下的最佳CTICR约为54％，而在其他操作方案下的最佳CTICR约为63％。发现基于离开热泵的冷却水与周围空气干球温度之间的固定温差的控制策略是所研究系统的最佳控制策略。 （C）2018 Elsevier B.V.保留所有权利。

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  • 来源
    《Energy and Buildings》 |2018年第9期|239-253|共15页
  • 作者

    Gong Xuemei; Xia Lei; Ma Zhenjun; Chen Guangming; Wei Lili;

  • 作者单位

    Ningbo Univ Technol, Bldg Energy Conservat Res Inst, Ningbo 315211, Zhejiang, Peoples R China;

    Univ Wollongong, Sustainable Bldg Res Ctr, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Sustainable Bldg Res Ctr, Wollongong, NSW 2522, Australia;

    Zhejiang Univ, Inst Refrigerat & Cryogen, State Key Lab Clean Energy Utilizat, Hangzhou 310058, Zhejiang, Peoples R China;

    Ningbo Univ Technol, Bldg Energy Conservat Res Inst, Ningbo 315211, Zhejiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hybrid ground source heat pump; Experiment; Simulation; Cooling tower; Input capacity ratio; Control strategy;

    机译：混合地面源热泵;实验;模拟;冷却塔;输入容量比;控制策略;

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