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A new model and analytical solutions for borehole and pile ground heat exchangers

机译：钻孔和桩基换热器的新模型和解析解

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摘要

The ground-coupled heat pump (GCHP) systems have been identified as one of the best sustainable energy technologies for space heating and cooling in buildings. While the foundation piles of buildings are used to partly take the place of boreholes in the ground heat exchanger (GHE) in recent years, the classical approaches of the line heat source model and the "hollow" cylindrical heat source model for the borehole GHEs fail for thermal analysis and design of the pile GHEs. Evolved from the classical models, a new "solid" cylindrical source model is presented in this paper to consider both the radial dimension and the heat capacity of the borehole or pile. Expressions of the analytical solution are derived for 1-D and 2-D new models by means of the Green's function method. Results obtained from the new 1-D model are compared with the classical line source and "hollow" cylindrical source models of the borehole GHE, and also validated by a numerical solution of the same model. While the 1-D and 2-D solid cylindrical source models can provide adequate tools for design and simulation of the pile GHEs, improvement can also be achieved in simulating the temperature response of the borehole GHEs, especially for short time steps.
机译：地面耦合热泵（GCHP）系统已被认为是用于建筑物空间加热和冷却的最佳可持续能源技术之一。近年来，虽然建筑物的基础桩用于部分替代地面热交换器（GHE）中的钻孔，但用于钻孔GHE的线热源模型和“空心”圆柱热源模型的经典方法却失败了用于桩GHE的热分析和设计。在经典模型的基础上，本文提出了一种新的“固体”圆柱源模型，该模型同时考虑了钻孔或桩的径向尺寸和热容量。通过格林函数方法，针对一维和二维新模型导出了解析解的表达式。从新的一维模型获得的结果与井眼GHE的经典线源模型和“空心”圆柱源模型进行比较，并通过同一模型的数值解进行了验证。虽然一维和二维实体圆柱源模型可以为桩GHE的设计和仿真提供足够的工具，但在模拟钻孔GHE的温度响应方面也可以实现改进，尤其是对于短时间步长。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第14期|2593-2601|共9页
  • 作者

    Yi Man; Hongxing Yang; Nairen Diao; Junhong Liu; Zhaohong Fang;

  • 作者单位

    The CSHP Research Center, Shandong Jianzhu University, Jinan, China Renewable Energy Research Group, The Hong Kong Polytechnic University, Hong Kong, China;

    Renewable Energy Research Group, The Hong Kong Polytechnic University, Hong Kong, China;

    The CSHP Research Center, Shandong Jianzhu University, Jinan, China;

    The CSHP Research Center, Shandong Jianzhu University, Jinan, China;

    The CSHP Research Center, Shandong Jianzhu University, Jinan, 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

    ground-coupled heat pump; ground heat exchanger; borehole; pile; model;

    机译：接地热泵;地面热交换器钻孔桩;模型;

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