Characteristics of medium deep borehole thermal energy storage
Characteristics of medium deep borehole thermal energy storage
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DOI：
10.1002/er.3570
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发表时间：
2016-10
影响因子：
4.6
通讯作者：
B. Welsch;W. Rühaak;D. Schulte;K. Bär;I. Sass
中科院分区：
文献类型：
--
作者：
B. Welsch;W. Rühaak;D. Schulte;K. Bär;I. Sass
季节性储能是科普可再生能源波动以及相应的能源供需不匹配所带来的挑战的重要组成部分。中深埋管换热器储热是钻孔储热的一种新途径。与传统的埋管存储相比，更少，但更深的埋管换热器进入地下，作为存储介质。因此，对浅层含水层的热影响大大减少，减轻了对饮用水质量的负面影响。此外，需要更少的表面积。然而，由于这一概念迄今尚未付诸实践，因此没有任何业务经验。在这项研究中，超过250个不同的数字存储模型进行了比较。特征设计参数对存储系统的行为和性能的影响进行了分析，通过改变参数，如井场布局，流体入口温度和储层岩石的性质。结果表明，特别是较大的系统有很高的潜力，有效的季节性储热。在夏季可以储存几吉瓦时的热能，并在供暖期间提取，回收率高达83%。中深埋管换热器阵列是适用于波动的可再生能源和工业过程废热的蓄热器。版权所有© 2016约翰威利父子有限公司.
Seasonal energy storage is an important component to cope with the challenges resulting from fluctuating renewable energy sources and the corresponding mismatch of energy demand and supply. The storage of heat via medium deep borehole heat exchangers is a new approach in the field of Borehole Thermal Energy Storage. In contrast to conventional borehole storages, fewer, but deeper borehole heat exchangers tap into the subsurface, which serves as the storage medium. As a result, the thermal impact on shallow aquifers is strongly reduced mitigating negative effects on the drinking water quality. Furthermore, less surface area is required. However, there are no operational experiences, as the concept has not been put into practice so far. In this study, more than 250 different numerical storage models are compared. The influence of the characteristic design parameters on the storage system's behaviour and performance is analysed by variation of parameters like borefield layout, fluid inlet temperatures and properties of the reservoir rocks. The results indicate that especially larger systems have a high potential for efficient seasonal heat storage. Several GWh of thermal energy can be stored during summertime and extracted during the heating period with a high recovery rate of up to 83%. Medium deep borehole heat exchanger arrays are suitable thermal storages for fluctuating renewable energy sources and waste heat from industrial processes. Copyright © 2016 John Wiley & Sons, Ltd.