Performance Analysis of a Combined Absorption Refrigeration-Liquid Desiccant Dehumidification THIC System Driven by Low-
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https://doi.org/10.1007/s11630-020-1363-6
Article ID: 1003-2169(2020)00-0000-00
Performance Analysis of a Combined Absorption Refrigeration-Liquid Desiccant Dehumidification THIC System Driven by Low-Grade Heat Source XU Cong1,2, SUI Jun1,2*, DAI Yuze1,2, LIU Feng1,2, LIU Hao1,2 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China 2. University of Chinese Academy of Sciences, Beijing 100049, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: Traditional condensing air-conditioning systems consume large amounts of energy in hot and humid areas, and it is difficult to achieve simultaneous control of temperature and humidity. A combined absorption refrigeration (AR) and liquid desiccant dehumidification (LDD) air-conditioning system based on cascade utilization of low-grade heat source is proposed. The system can realize independent control of temperature and humidity and carry out profound recovery of low-grade heat sources. Under the design conditions, the heat utilization rate ζ reaches 21.05%, which is 2.73 times that of the conventional absorption refrigeration reference system. A parametric sensitivity analysis is performed to optimize the system. The ζ increases from 9.79% to 18.55% and the coefficient of performance COPt increases from 0.33 to 0.35 with an increase in chilled water temperature from 7°C to 15°C. With an increase in regenerant solution temperature from 60°C to 70°C, the ζ achieves the optimal value of 21.05% at 68°C. ζ decreases from 21.05% to 15.05% as the concentration of the regenerant solution increases from 36% to 40%. Under variable environmental temperature and humidity, the ζ of the proposed system changes within a small range and stays much higher than that of the reference system with the same quality heat source, which indicates that the proposed system has a better adaptability to changing environmental parameters.
Keywords: temperature and humidity independent control (THIC), low-grade heat source, cascade utilization, heat utilization rate
1. Introduction Traditional condensing air-conditioning systems cannot meet the target temperature and humidity demands in high temperature and high humidity areas at the same time or have the problem of heat and cold offsetting energy waste. To achieve the environmental control in places with strict requirements for indoor environmental indicators and improve the quality of people’s living and working environments [1], the theory Received: Mar 20, 2020
of temperature and humidity independent control (THIC) is proposed [2]. THIC technology separates the latent heat and sensible heat of the air. First, the humidity is controlled by dehumidification technology, and then the temperature is controlled by terminal cooling technology. This technology can not only accurately control the temperature and humidity parameters to achieve profound dehumidification but also improve the performance coefficient of the refrigeratio
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