This paper aims to explore an efficient, cost-effective, and water-saving seasonal cold energy storage technique based on borehole heat exchangers to cool the condenser water in a 10 MW solar thermal power plant. The proposed seasonal cooling mechanism is designed for the areas under typical weather conditions to utilize the low ambient temperature during the winter season and to store cold energy. The main objective of this paper is to utilize the storage unit in the peak summer months to cool the condenser water and to replace the dry cooling system. Using the simulation platform transient system simulation program (TRNSYS), the borehole thermal energy storage (BTES) system model has been developed and the dynamic capacity of the system in the charging and discharging mode of cold energy for one-year operation is studied. The typical meteorological year (TMY) data of Dunhuang, Gansu province, in north-western China, is utilized to determine the lowest ambient temperature and operation time of the system to store cold energy. The proposed seasonal cooling system is capable of enhancing the efficiency of a solar thermal power plant up to 1.54% and 2.74% in comparison with the water-cooled condenser system and air-cooled condenser system respectively. The techno-economic assessment of the proposed technique also supports its integration with the condenser unit in the solar thermal power plant. This technique has also a great potential to save the water in desert areas.

本文旨在探索一种有效，经济，节水的季节性冷能存储技术，该技术基于钻孔热交换器来冷却10 MW太阳能热电厂的冷凝器水。拟议的季节降温机制是针对典型天气条件下的区域设计的，以在冬季利用较低的环境温度并存储冷能。本文的主要目的是在夏季高峰期利用存储单元冷却冷凝器水，并取代干式冷却系统。利用仿真平台暂态系统仿真程序（TRNSYS），开发了井下储热系统（BTES）系统模型，研究了该系统在冷能充放电模式下一年运行的动态容量。利用西北地区甘肃省敦煌市的典型气象年（TMY）数据来确定系统的最低环境温度和运行时间，以存储冷能。与水冷式冷凝器系统和风冷式冷凝器系统相比，拟议的季节性冷却系统能够将太阳能热电厂的效率分别提高1.54％和2.74％。对拟议技术的技术经济评估还支持其与太阳能热电厂的冷凝器单元集成。该技术还具有在沙漠地区节水的巨大潜力。与水冷式冷凝器系统和风冷式冷凝器系统相比，拟议的季节性冷却系统能够将太阳能热电厂的效率分别提高1.54％和2.74％。对拟议技术的技术经济评估还支持其与太阳能热电厂的冷凝器单元集成。该技术还具有在沙漠地区节水的巨大潜力。与水冷式冷凝器系统和风冷式冷凝器系统相比，拟议的季节性冷却系统能够将太阳能热电厂的效率分别提高1.54％和2.74％。对拟议技术的技术经济评估还支持其与太阳能热电厂的冷凝器单元集成。该技术还具有在沙漠地区节水的巨大潜力。