Abstract A novel vertical air-soil heat exchanger (VASHE) is proposed, coupling with diversified energy storage components, i.e., both annular and tubular phase change material (PCM) components. Compared to traditional air-soil heat exchanger systems, advantages of the new VASHE include the space-saving, higher energy efficiency, centralized discharge of condensate water and smaller fluctuation of outlet air temperature. An enthalpy-based model is developed to characterise the underlying heat transfer mechanism of the sophisticated sensible and latent heat transfer in PCMs. An experimental platform is thereafter constructed for the calibration of the developed enthalpy-based numerical model. Systematic parametrical analysis has been conducted on PCM types, PCM structure and PCM locations. Research results indicated that, the developed enthalpy-based model was accurate to predict the system performance with the maximum relative error at 1.98%. Systematic parametric analysis indicates that, within various PCM types, the RT 20 in the tubular PCM is the most promising with the smallest outlet temperature amplitude. Furthermore, accurate PCM location is an effective solution to the contradiction between daily cooling storage capacity and outlet temperature amplitude. This study demonstrates a novel air-soil heat exchanger with diversified energy storage components, which can provide concrete guidance and pave path for the geothermal energy utilisation.

中文翻译：

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具有多种储能组件的新型气土换热器耦合的动态性能——建模开发、实验验证、参数化设计和稳健运行

摘要 提出了一种新型的立式气土换热器（VASHE），它与多种储能组件相耦合，即环形和管状相变材料（PCM）组件。与传统的气土换热系统相比，新型VASHE的优势在于节省空间、能效更高、冷凝水集中排放、出风温度波动更小。开发了一种基于焓的模型来表征 PCM 中复杂的显热和潜热传递的潜在热传递机制。此后构建了一个实验平台，用于校准已开发的基于焓的数值模型。对PCM类型、PCM结构和PCM位置进行了系统的参数分析。研究结果表明，开发的基于焓的模型可以准确预测系统性能，最大相对误差为 1.98%。系统参数分析表明，在各种 PCM 类型中，管状 PCM 中的 RT 20 是最有前途的，出口温度幅度最小。此外，精确的PCM定位是解决日蓄冷量与出口温度幅值之间矛盾的有效方法。本研究展示了一种具有多种储能组件的新型气土换热器，可为地热能的利用提供具体的指导和铺路。管状 PCM 中的 RT 20 是最有前途的，出口温度幅度最小。此外，准确的PCM定位是解决日蓄冷量与出口温度幅值矛盾的有效方法。本研究展示了一种具有多种储能组件的新型气土换热器，可为地热能的利用提供具体的指导和铺路。管状 PCM 中的 RT 20 是最有前途的，出口温度幅度最小。此外，准确的PCM定位是解决日蓄冷量与出口温度幅值矛盾的有效方法。本研究展示了一种具有多种储能组件的新型气土换热器，可为地热能的利用提供具体的指导和铺路。