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Performance evaluation and optimization design of deep ground source heat pump with non-uniform internal insulation based on analytical solutions

机译：基于分析解决方案的非均匀内部绝缘性深源热泵性能评价与优化设计

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摘要

Deep borehole heat exchanger (DBHE) based ground source heat pump (GSHP) is a promising system for geothermal energy application in medium-deep layer. In this study, DBHE with non-uniform pipe insulation is proposed and numerically investigated. An effective analytical model is built based on segmented finite line-source method and a newly derived water heat transfer model. The year-round field test data are used for model verification. In-depth analyses are given to a comparison between the uniform and non-uniform insulation cases in both heating and cooling modes, and sensitivity analysis on non-uniformity of insulation. A orthogonal test is conducted for energy performance evaluation and optimization. It is found that DBHE with non-uniform insulation can outperform the one with full insulation in cooling mode, which offers new insights. In addition, an optimum insulation length can be identified through the non-uniformity analysis on insulation. It shows that the order of influence factor is heating season duration ratio, flow rate of working fluid, material thermal resistance non-uniformity of the center pipe, pipe sizing ratio, borehole depth, and insulation length non-uniformity of the center pipe. By choosing the proper system design parameters, the system energy saving could be up to 21.8%. (C) 2020 Elsevier B.V. All rights reserved.
机译：基于深层钻孔热交换器（DBHE）的地源热泵（GSHP）是中深层地热能应用的有希望的系统。在该研究中，提出了具有非均匀管道绝缘的DBHE和数值研究。基于分段有限线源法和新衍生的水传热模型，建立了有效的分析模型。全年的现场测试数据用于模型验证。深入的分析被赋予加热和冷却模式均匀和非均匀绝缘例之间的比较，以及对绝缘的不均匀性的灵敏度分析。进行正交测试以进行能量绩效评估和优化。结果发现，具有非均匀绝缘体的DBHE可以优于具有完全绝缘的冷却模式，提供新的见解。另外，可以通过对绝缘体的不均匀性分析来识别最佳绝缘长度。它表明，影响因素的顺序是加热季节持续时间，工作流体的流速，材料热阻的中心管，管尺寸，钻孔深度和绝缘长度的中心管的不均匀性。通过选择正确的系统设计参数，系统节能可达21.8％。 （c）2020 Elsevier B.V.保留所有权利。

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