Modelling analysis of a solar-driven thermochemical energy storage unit combined with heat recovery
Modelling analysis of a solar-driven thermochemical energy storage unit combined with heat recovery
复制标题
DOI：
10.1016/j.renene.2023.02.076
复制
发表时间：
2023-02
期刊：
影响因子：
8.7
通讯作者：
Yong Zhang;Mingke Hu;Ziwei Chen;Yuehong Su;S. Riffat
中科院分区：
文献类型：
--
作者：
Yong Zhang;Mingke Hu;Ziwei Chen;Yuehong Su;S. Riffat
太阳能驱动的热化学储能（TCES）可以解决太阳能产热与供暖需求之间的不匹配问题，并有助于建筑物脱碳。在对典型盐水合物 TCES 系统的许多研究中，充电阶段排出的潮湿气流携带的大量热量没有得到充分利用，而是直接消散到环境中。因此，本研究提出一种集成热交换器的太阳能光伏/热动力TCES系统（PV/T-TCES-HEX系统）来回收这部分热量。为了研究添加 PV/T 集热器和热交换器 (HEX) 对 TCES 系统性能的影响，通过 COMSOL 建模将 PV/T-TCES-HEX 系统的热性能与其他两种 TCES 系统进行了比较。结果表明，在诺丁汉典型的夏季，PV/T-TCES-HEX 系统需要额外的外部电力输入 11.86kWh，仅为仅 TCES 系统的 40.53%。 PV/T-TCES-HEX系统的整体热效率为56.00%，效率提升了146.80%。较低的质量流量导致较高的热效率和存储能量。当反应器床层厚度为0.04m（57.55%）和反应器床层长度为0.5m（58.73%）时系统总体热效率最高。
Solar-driven thermochemical energy storage (TCES) can address the mismatch between solar heat production and heating demand and contribute to decarbonisation in buildings. In many studies of typical salt hydrate TCES systems, massive heat carried by the discharged humid airflow during the charging phase is not well-utilised but directly dissipated to the ambient. Therefore, a solar photovoltaic/thermal-powered TCES system integrating a heat exchanger (PV/T-TCES-HEX system) is proposed in this study for recovering this part of heat. To study the effect of adding the PV/T collector and heat exchanger (HEX) on the performance of the TCES system, the thermal performance of the PV/T-TCES-HEX system is compared with other two TCES systems via COMSOL modelling. Results suggest that the PV/T-TCES-HEX system requires an additional external electricity input of 11.86 kWh on a typical summer day in Nottingham, which is only 40.53% of the TCES-only system. The overall thermal efficiency of the PV/T-TCES-HEX system is 56.00%, indicating an efficiency enhancement of 146.80%. A lower mass flow rate leads to higher thermal efficiency and storage energy. The system has the highest overall thermal efficiency when the reactor bed thickness is 0.04 m (57.55%) and when the reactor bed length is 0.5 m (58.73%).