Energy Performance Evaluation of a Desiccant Air Handling System to Maximize Solar Thermal Energy Use in a Hot and Humid Climate
Energy Performance Evaluation of a Desiccant Air Handling System to Maximize Solar Thermal Energy Use in a Hot and Humid Climate
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DOI：
10.3390/su12051921
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发表时间：
2020-03
期刊：
影响因子：
3.9
通讯作者：
M. Ukai;M. Okumiya;Hideki Tanaka
中科院分区：
文献类型：
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作者：
M. Ukai;M. Okumiya;Hideki Tanaka
干燥剂空气处理机组是除湿处理系统的主要类型之一，需要热水或热空气来再生吸附材料。如果使用太阳能热能作为再生热源，一般要安装备用电加热器、备用锅炉或热电联产（CHP），以保持稳定的热水供应。本研究提出了一种利用太阳能热能的干燥剂空气处理系统的有效控制方法（柔性控制），并通过系统仿真将其与传统控制方法（固定控制）的能量性能进行了比较。日行为分析表明，无备用锅炉的固定控制系统不能处理潜在负荷（7月和8月未处理潜在负荷为28 GJ）。另一方面，没有备用锅炉的灵活控制系统能够处理所需的潜热负荷。基于固定控制需要备用锅炉处理潜在负荷的事实，考虑了带备用锅炉的固定控制系统的能源性能比较。仿真结果表明，无备用锅炉柔性控制系统的一次能量性能系数（COP）达到1.56。另一方面，带备用锅炉的固定控制系统的一次能量COP仅为1.43。这证明了与固定控制相比，柔性控制有助于提高系统的能量性能，并能最大限度地利用太阳热能。
A desiccant air handling unit is one of the major types of dehumidification handling systems and requires hot water or hot air to regenerate sorption materials. If solar thermal energy is used as the heat source for regeneration, in general, a backup electrical heater, backup boiler, or combined heat and power (CHP) is installed in order to maintain a stable hot water supply. In this study, effective control is proposed for a desiccant air handling system that uses solar thermal energy (flexible control), and its energy performance is compared to that of a traditional control (the fixed control) through a system simulation. The diurnal behavior shows that the system with a fixed control without a backup boiler cannot process the latent load properly (28 GJ of unprocessed latent load for July and August). On the other hand, the system with a flexible control without a backup boiler is able to process required latent heat load. Based on the fact that the fixed control needs a backup boiler to process the latent load, the system with a fixed control with a backup boiler is considered for the energy performance comparison. The simulation results show that the primary energy-based coefficient of performance (hereafter, COP) of the system with a flexible control without a backup boiler reaches 1.56. On the other hand, the primary energy-based COP of the system with a fixed control with a backup boiler reaches only 1.43. This proves that the flexible control contributes to the higher energy performance of the system and maximizes the use of solar thermal energy more than the fixed control.