地下冷热储能系统热力分析
Thermal analysis of underground thermal energy storage systems
摘要：
从热力学和传热学的角度，分析了地下冷热储能系统的特性，并与地源热泵系统进行了比较。地下冷热储能系统主要是被动供冷或供热，具有更高的能效。因此，需要提高储存能量的品质以达到被动利用的水平，并采用合适的末端放宽用户侧对能源品质的要求，以达到提高储能效率和能源利用率的目的。而构置地下冷热储能过程的冷热分层或分区在最大程度上保持了储能过程的能源品质，同时也强化了传热。
Abstract：
The energy efficiency of underground thermal energy storage (UTES) system has been analysed from the fundamental laws of thermodynamics and heat transfer theory, in comparison with similar technology of ground-source heat pump (GSHP) system. The main characteristic of UTES is a passive cooling or heating system, which has high energy efficiency. The storage of high quality thermal energy could improve its application level of passive cooling or heating. While the suitable terminal system could relax the requirement of thermal energy quality from demand side, thus high thermal energy storage and utilization efficiency could be reached. The storage system with thermal stratification or different temperature zone design could maintain thermal energy quality at large extent and at the same time enhance the heat transfer.
Keywords:underground thermal energy storage (UTES); aquifer thermal energy storage (ATES); borehole thermal energy storage (BTES); ground-source heat pump (GSHP); energy efficiency; thermal analysis