Abstract

The development and application of enhanced geothermal system and hydrothermal system are constrained due to high cost and high risk of induced seismicity or heavily reliance on hot water reservoir. Deep borehole heat exchanger (DBHE) technology is independent of hot water reservoir and hydraulic fracturing; however, the poor thermal conductivity of rocks limits its performance improvement. To deal with these problems, a novel technology for acquiring geothermal energy using DBHE with horizontal branch wells (DBHE-HBW) is proposed here. It is found that DBHE-HBW has better performance than DBHE and, under the condition of nearly equal total cross-sectional area of well tube, the smaller the horizontal well tube diameter, the greater the thermal output and the shorter the payback period of DBHE-HBW. Therefore, DBHE-HBW can be recommended for large-scale application in building heating sector.

中文翻译：

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建筑采暖用水平支井深埋管换热器分析

摘要

由于成本高、诱发地震风险高或严重依赖热水储层，增强型地热系统和热液系统的开发和应用受到限制。深井换热器（DBHE）技术独立于热水储层和水力压裂；然而，岩石的不良导热性限制了其性能的提高。针对这些问题，本文提出了一种利用带水平分支井的DBHE获取地热能的新技术（DBHE-HBW）。研究发现，DBHE-HBW比DBHE具有更好的性能，在井管总截面积基本相等的情况下，水平井管直径越小，热输出越大，DBHE的投资回收期越短。 -HBW。所以，