Review of internally cooled liquid desiccant air dehumidification: Materials, components, systems, and performances

Guan, Bowen; Zhang, Tao; Líu, Jùn; Liu, Xiaohua; Yin, You

doi:10.1016/j.buildenv.2021.108747

Cited by 25 publications

(4 citation statements)

References 101 publications

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“…Energy shortage and global warming have made human beings focus on the utilization of renewable energy and improving the energy conversion efficiency of air-conditioning systems. Since liquid desiccant cooling (LDCS) systems are more energy-efficient than compression refrigeration and can be driven by low-grade energy, the proportion of applications in energy-efficient buildings is gradually increasing [1]. The high energy consumption and low energy conversion efficiency of the regenerator are important problems that limit the further development of this system.…”

Section: Introductionmentioning

confidence: 99%

Solar interfacial regeneration performance of different solutions for liquid desiccant cooling system

2023

J. Phys.: Conf. Ser.

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A liquid desiccant cooling system (LDCS) is a promising energy-saving air-conditioning system with the advantages of being driven by low-grade heat and excellent humidity control ability. However, the problems of high energy consumption and low energy utilization efficiency of its regenerator limit its further development. To improve, a novel solar interfacial regeneration (SIR) method is proposed. The method can convert solar energy into heat and locate the heat at the evaporation interface so that the regenerator has high energy utilization efficiency. Experimental studies were carried out on different liquid desiccants. The results show that the thermal regeneration efficiency of this method is 2.6 to 2.9 times that of the conventional thermal regeneration method. LiBr solution has the best regeneration performance, but MgCl2 and CaCl2 are cheaper. Considering energy utilization efficiency and economic cost, the mixed desiccant may be a better choice. These advances could make SIR-based LDCS a potential contender for future air-conditioning systems.

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Section: Introductionmentioning

confidence: 99%

Solar interfacial regeneration performance of different solutions for liquid desiccant cooling system

2023

J. Phys.: Conf. Ser.

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“…This poses challenges for cooling and dehumidification in highhumidity regions [4]. To address these issues, researchers are exploring safe and efficient alternatives to traditional MVCR systems, such as indirect evaporative cooling (IEC) and liquid desiccant dehumidification (LDD) [5] technologies. The combination of LDD and IEC technologies in a regenerative internally cooled liquid desiccant air conditioning system (RLDAC) has shown great promise in overcoming the limitations of traditional air conditioning systems.…”

Section: Introductionmentioning

confidence: 99%

“…It is important to configure the system to make it handle the air to meet the air conditioning supply conditions. In previous multi-stage evaporative cooling and dehumidification systems, dehumidification devices represented by desiccant wheels [12], liquid desiccants [5,13], and evaporative coolers [14] were often used as air pretreatment or recovery devices. It is rare to use a multi-stage LDAC system directly to treat the air to the supply air state point without any vapor compression device.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Liquid Desiccant Cooling Systems in Hot and Humid Areas

Zhang,

Yang

et al. 2023

Sustainability

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Air-conditioning systems in hot and humid regions account for over 50% of total energy usage. Integrating an indirect evaporative cooling (IEC) and a liquid desiccant dehumidifier (LDD) as the liquid desiccant cooling system (LDCS) presents an energy-saving and emission-reducing solution to replace traditional mechanical vapor compression refrigeration (MVCR) systems. This integration overcomes the regional limitations of IEC in hot and humid areas. The newly developed LDCS uses exhaust air as the working air source and solar energy as the heat source for desiccant solution regeneration. This study aims to develop an empirical model for the outlet parameters of the LDCS, propose an optimization strategy for its operating parameters, and assess the potential and energy performance through parameter analysis and multifactor optimization. By conducting sensitivity analysis and optimizing six critical parameters based on a response surface model (RSM), the system outlet temperature, relative humidity, and coefficient of performance (COP) are improved as the optimization objectives. The regional capability is demonstrated in three selected hot and humid cities. The results indicate that the LDCS can significantly increase the COP by 57.3%. Additionally, it can meet the dehumidification demand when operating with 25% of the air extracted in the RIEC during months with high humidity and temperature. This study will facilitate the application of IEC and LDD technologies, guide the design and operation scheme of the system, and promote energy-saving and emission-reducing solutions in hot and humid regions.

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“…In the LDDS, the selection of the liquid desiccant is very crucial for the regeneration and dehumidification process [13]. An appropriate liquid desiccant for an LDDS should possess a number of characteristics, such as availability, non-corrosive, low regeneration temperature, low viscosity, low equilibrium vapor pressure, high heat transfer, low surface tension, nonvolatile, stability, and low cost [14]. CaCl 2 , lithium bromide (LiBr), LiCl, and magnesium chloride (MgCl 2 ) are the most frequently employed liquid desiccants in LDDS, and their dehumidification and regeneration capabilities are widely utilized in recent engineering applications [15].…”

Section: Introductionmentioning

confidence: 99%

Economic and Experimental Assessment of KCOOH Hybrid Liquid Desiccant-Vapor Compression System

Kumar

Singh

2022

Sustainability

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A liquid desiccant dehumidification cooling system is a promising, energy-saving, high-efficiency, environmentally friendly technology that maintains thermal comfort effectively indoors by utilizing renewable energy sources or waste heat to enhance system efficiency. In this research, a small-scale (6 kW cooling capacity) hybrid liquid desiccant air-conditioning system (HLDAC) is proposed to evaluate the dehumidification performance of a non-corrosive potassium formate (KCOOH) solution. For this, four input parameters, namely, inlet air flow rate, inlet desiccant temperature, inlet desiccant concentration, and inlet specific air humidity, were selected. Moreover, the different combinations of experiments were designed by employing response surface methodology (RSM) to evaluate the dehumidification performance parameters, namely, dehumidifier latent heat load, coefficient of performance of hybrid system, and moisture removal rate (MRR). Further, a comparative performance analysis between the hybrid system and a standalone vapor compression system (VCS) unit was carried out. The result showed a remarkable increase in coefficient of performance, which was observed at about 28.48% over the standalone VCS unit. Furthermore, the economic assessment of the proposed hybrid system is presented in this paper. Finally, from the economic analysis, it was concluded that the hybrid system had a payback time of 2.65 years compared to the VCS unit.

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Review of internally cooled liquid desiccant air dehumidification: Materials, components, systems, and performances

Cited by 25 publications

References 101 publications

Solar interfacial regeneration performance of different solutions for liquid desiccant cooling system

Solar interfacial regeneration performance of different solutions for liquid desiccant cooling system

Optimization of the Liquid Desiccant Cooling Systems in Hot and Humid Areas

Economic and Experimental Assessment of KCOOH Hybrid Liquid Desiccant-Vapor Compression System

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