公共建筑储热式地热供暖系统多目标协同优化. (Chinese)

Thermal energy storage (TES) technology is one of the important measures to solve the problem of the mismatch between supply and demand of the geothermal heating system for public buildings and improve the geothermal energy utilization rate. However, the introduction of TES units will increase the investment and maintenance cost of the geothermal heating system, and thus to some extent, its development is limited. With taking an office building located in Cangzhou, Hebei province, China, as research object, a geothermal heating system with a hot water storage tank as a TES unit was built, and collaborative optimization for equipment selection and operation strategies was carried out with the comprehensive cost, geothermal energy utilization rate and carbon emission as the optimization objectives. The results showed that compared with the benchmark system, the performance of the geothermal heating system with the addition of TES was significantly improved. Besides, reasonable operation control of the TES, as well as heat pump, was the key measure to reduce the system cost and carbon emission as well as improve the geothermal energy utilization rate. On this basis, the optimal operation strategy and corresponding equipment selection parameters of the geothermal heating system with TES were determined respectively. Compared with the benchmark system, the comprehensive cost of the system was reduced by 30.24%, the daily average geothermal energy utilization rate was increased by 11.12%, and the carbon dioxide emission was reduced by 46.65%. [ABSTRACT FROM AUTHOR]

储热技术是解决办公建筑地热供暖系统供需难以良好匹配及提高地热能利用率的有效手段之一, 然而储热 装置的引入将增加供暖系统的投资与维护成本, 在一定程度上使系统发展受限。以位于河北省沧州地区的某办公建 筑为研究对象, 构建了储热式地热供暖系统模型, 以综合成本、地热能利用率与碳排放量为优化目标, 对系统设备 选型及运行策略开展协同优化设计。研究表明, 与基准系统相比, 增设储热水箱可以明显改善地热供暖系统的性能; 合理地控制储热水箱储、放热与热泵机组运行是降低系统成本与碳排放量、提高地热能利用率的关键。在此基础上, 确定了储热式地热供暖系统的最优运行策略以及对应的设备选型优化参数。最优运行策略下相较于基准系统综合成 本降低30.24%, 日均地热能利用率提高11.12%, 碳排放量减少46.65%. [ABSTRACT FROM AUTHOR]

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