Abstract The use of thermoelectric generators with phase change heat exchangers has demonstrated to be an interesting and environmentally friendly alternative to enhanced geothermal systems (EGS) in shallow hot dry rock fields (HDR), since rock fracture is avoided. The present paper studies the possibilities of the former proposal in a real location: Timanfaya National Park (Canary Islands, Spain), one of the greatest shallow HDR fields in the world, with 5000 m2 of characterized geothermal anomalies presenting temperatures up to 500 °C at only 2 m deep. For this purpose, a computational model based on the thermal-electrical analogy has been developed and validated thanks to a real prototype, leading to a relative error of less than 8%. Based on this model, two prototypes have been designed and studied for two different areas within the park, varying the size of the heat exchangers and the number of thermoelectric modules installed. As a result, the potential of the solution is demonstrated, leading to an annual electricity generation of 681.53 MWh thanks to the scalability of thermoelectric generators. This generation is obtained without moving parts nor auxiliary consumption, thus increasing the robustness of the device and removing maintenance requirements.

中文翻译：

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带相变换热器的地热热电发电机的计算研究

摘要 由于避免了岩石破裂，在浅层干热岩区 (HDR) 中使用带有相变热交换器的热电发电机已被证明是一种有趣且环保的替代增强型地热系统 (EGS) 的方法。本论文研究了先前提议在真实位置的可能性：蒂曼法亚国家公园（西班牙加那利群岛），世界上最大的浅层 HDR 田地之一，拥有 5000 平方米的特征性地热异常，温度高达 500 °C仅 2 m 深。为此，基于热电类比的计算模型已经开发并通过真实原型进行验证，导致相对误差小于 8%。基于此模型，针对公园内的两个不同区域设计并研究了两个原型，改变热交换器的尺寸和安装的热电模块的数量。因此，该解决方案的潜力得到了证明，由于热电发电机的可扩展性，年发电量达到 681.53 MWh。这一代产品没有移动部件，也没有辅助消耗，从而提高了设备​​的鲁棒性并消除了维护需求。