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Performance comparison of liquid desiccant air handling processes from the perspective of match properties

机译：从匹配特性的角度比较液体干燥剂空气处理过程的性能

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摘要

The energy consumption of air-conditioning systems represents a large part of the entire building energy consumption in non-residential buildings. Heat pump-driven liquid desiccant (HPLD) systems have become more and more popular because of their high energy efficiency, and there are many different ways to utilize the condensing heat in this type of air handling device. In the present study, the match properties of the heat and mass transfer processes in the air-desiccant system varying with the inlet air states are investigated, and the unmatched coefficient based on entransy dissipation is adopted to evaluate the performance of HPLD systems. It is demonstrated that the unmatched coefficient of the process along the iso-concentration line is much lower than that along the isenthalpic line. A higher unmatched coefficient means a higher heat or mass transfer resistance caused by the unmatched flow rates or parameters. The HPLD system in which solution is heated for regeneration (Basic Type Ⅱ) performs much better than the system in which regeneration air is heated (Basic Type Ⅰ). The unmatched coefficients of the condenser and regenerator decrease from 2.70 and 1.34, respectively, in Basic Type I, to 1.07 and 1.05, respectively, in Basic Type Ⅱ. Moreover, COP_(sys) is significantly improved, rising from 1.83 to 4.17.
机译：空调系统的能耗占非住宅建筑整个建筑能耗的很大一部分。热泵驱动的液体干燥剂（HPLD）系统由于其高能效而变得越来越流行，并且在这种类型的空气处理设备中有许多种利用冷凝热的方法。在本研究中，研究了除湿系统中传热和传质过程的匹配特性，该匹配特性随进气状态的变化而变化，并采用基于瞬态耗散的不匹配系数来评估HPLD系统的性能。结果表明，沿着等浓度线的过程的不匹配系数远低于沿着等焓线的过程的不匹配系数。更高的不匹配系数意味着由不匹配的流速或参数导致更高的传热或传质阻力。加热溶液进行再生的HPLD系统（基本类型Ⅱ）比加热再生空气的系统（基本类型Ⅰ）的性能要好得多。冷凝器和再生器的不匹配系数分别从基本类型I的2.70和1.34降低到基本类型Ⅱ的1.07和1.05。此外，COP_（sys）得到了显着提高，从1.83提高到4.17。

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