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首页> 外文期刊>Energy Conversion & Management >Critical comparison between thermal performance test (TPT) and thermal response test (TRT): Differences in heat transfer process and extractable information
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Critical comparison between thermal performance test (TPT) and thermal response test (TRT): Differences in heat transfer process and extractable information

机译：热性能测试（TPT）和热响应测试（TRT）之间的关键比较：传热过程和可提取信息的差异

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摘要

In the field of ground-source heat pumps (GSHPs), thermal response tests (TRTs) with constant heat rate have been conducted to estimate the design parameters of ground heat exchangers (GHEs), and thermal performance tests (TPTs) with constant inlet temperature have been conducted to examine the heat exchange performance of GHEs. These two experimental methods have been discussed insufficiently, and therefore, they are sometimes perceived as completely different experiments with mutually exclusive extractable information. However, both methods provide similar information, although there are differences in the heat transfer process. For better understanding these two methods and extending the utilization potential of TPT and TRT data, this study analyzes and discusses the following two issues using numerically generated datasets: (1) differences in heat transfer process between TRTs and TPTs and (2) effect of different physical processes on the extractable information and its accuracy, such as the ground thermal conductivity, borehole thermal resistance, unit heat exchange rate, and transient ground thermal resistance. From the viewpoint of the heat transfer process, we found that the GHE's heat storage effect disappears faster in TPT than in TRT. When estimating ground thermal properties, this difference allows the TPT to be more accurate with shorter experiment time than the TRT. Additionally, we found that the TRT overestimated the GHE thermal performance compared to the TPT. However, when the heat storage effect was removed, both methods provided almost identical results. A comparison of experimentally obtained ground thermal resistances, which are required in the ASHRAE design method, with those obtained from the infinite cylindrical source model indicated that the TPT showed discrepancy rates less than 8% whereas the TRT showed larger discrepancy rates. In particular, when the heat storage effect is not removed, the discrepancy rate for the short-term ground thermal resistance increased by similar to 27%.
机译：在地源热泵（GSHP）领域，已经进行了恒定热速率的热响应测试（TRT），以估算地面热交换器（GHE）的设计参数，以及恒定入口温度的热性能测试（TPT）。已经进行了检查GHE的热交换性能。对这两种实验方法的讨论不够充分，因此，有时将它们视为互斥的可提取信息的完全不同的实验。但是，尽管传热过程有所不同，但这两种方法都提供相似的信息。为了更好地理解这两种方法并扩展TPT和TRT数据的利用潜力，本研究使用数值生成的数据集分析和讨论了以下两个问题：（1）TRT和TPT之间的传热过程差异以及（2）不同的影响有关可提取信息及其准确性的物理过程，例如地面导热系数，钻孔热阻，单位热交换率和瞬时地面热阻。从传热过程的角度来看，我们发现GHE的储热效果在TPT中比在TRT中消失得更快。在估算地面热特性时，该差异使得TPT在更短的实验时间内比TRT更加准确。此外，我们发现与TPT相比，TRT高估了GHE的热性能。但是，当消除储热效果时，两种方法都提供几乎相同的结果。将ASHRAE设计方法所需的实验获得的地面热阻与从无限圆柱源模型获得的地面热阻进行比较，结果表明TPT的差异率小于8％，而TRT的差异率更大。特别是，如果不消除蓄热效果，则短期接地热阻的差异率将增加约27％。

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