Recent developments in solar assisted liquid desiccant evaporative cooling technology—A review

Büker, Mahmut Sami; Riffat, Saffa

doi:10.1016/j.enbuild.2015.03.020

Cited by 98 publications

(31 citation statements)

References 51 publications

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“…A desiccant is a hygroscopic substance that has an affinity to remove moisture from the surroundings [7]. tower, rotating desiccant wheel and falling film column [9].…”

Section: Desiccantsmentioning

confidence: 99%

Comparison of Liquid Desiccants for Air Cooling Systems Using Wetted Wall Column

Shanmugapriya

Balachandar²,

Wadhwania³

2019

IJMPERD

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Desiccant dehumidification refers to the use of chemical for absorption of water vapor to dehumidify air, and thus reduce the latent cooling load in a building's Heating, Ventilation and AirConditioning system. There are two types of desiccant systems: liquid and solid. Liquid desiccant systems remove more moisture from air than the dry desiccant systems. Some of the commonly used liquid desiccants include lithium bromide and lithium chloride. The paper presents a comparative analysis of three desiccants, namely, calcium chloride, lithium chloride and potassium formate. Calcium chloride and lithium chloride are commonly used whereas potassium formate is a new desiccant. The wetted wall column is used to study the dehumidifying property of each chosen desiccant. The gas enters in a counter-current fashion allowing gas-liquid contact. The analysis is used to understand the variations in the dehumidifying nature of the desiccants.

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“…A desiccant is a hygroscopic substance that has an affinity to remove moisture from the surroundings [7]. tower, rotating desiccant wheel and falling film column [9].…”

Section: Desiccantsmentioning

confidence: 99%

Comparison of Liquid Desiccants for Air Cooling Systems Using Wetted Wall Column

Shanmugapriya

Balachandar²,

Wadhwania³

2019

IJMPERD

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“…Both these desiccants have been widely used for dehumidification, cooling and drying purposes [28][29][30].…”

Section: Desiccants Overviewmentioning

confidence: 99%

Thermodynamics and economics of liquid desiccants for heating, ventilation and air-conditioning – An overview

Giampieri

Smallbone

et al. 2018

Applied Energy

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In an effort to minimise electricity consumption and greenhouse gases emissions, the heating, ventilation and airconditioning sector has focused its attention on developing alternative solutions to electricallydriven vapour-compression cooling. Liquid desiccant airconditioning systems represent an energyefficient and more environmentally friendly alternative technology for dehumidification and cooling, particularly in those cases with high latent loads to maintain indoor air quality and comfort conditions. This technology is considered particularly efficient in hot and humid climates. As a matter of fact, the choice of the desiccant solution influences the overall performance of the system. The current paper reviews the working principle of liquid desiccant systems, focusing on the thermodynamic properties of the desiccant solutions and describes an evaluation of the reference thermodynamic properties of different desiccant solutions to identify which thermodynamic, physical, transport property influences the liquid desiccant process and to what extent. The comparison of these thermodynamic properties for the commonly used desiccants is conducted to estimate which fluid could perform most favourably in the system. The economic factors and the effect of different applications and climatic conditions on the system performance are also described. The paper is intended to be the first step in the evaluation of alternative desiccant fluids able to overcome the problems related to the use of the common desiccant solutions, such as crystallization and

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“…By utilizing renewable energy in the regeneration process, the LDDC system can be more sustainable and economical, for example the abundant solar energy. Not only solar thermal but also photovoltaic technologies can be integrated into a solar-assisted LDDC system [30]. The feasibility of a membrane-based liquid desiccant dehumidification cooling (MLDDC) system powered by solar thermal energy is proved in [31]with significant economic and environmental benefits.…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of a membrane liquid desiccant dehumidification cooling system based on experimental investigations

Chen

Zhu

Bai

2017

Energy and Buildings

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A membrane-based liquid desiccant dehumidification cooling system is studied in this paper for energy efficient air conditioning with independent temperature and humidity controls. The system mainly consists of a dehumidifier, a regenerator, an evaporative cooler and an air-to-air heat exchanger. Its feasibility in the hot and humid region is assessed with calcium chloride solution, and the influences of operating variables on the dehumidifier, regenerator, evaporative cooler and overall system performances are investigated through experimental work. The experimental results indicate that the inlet air condition greatly affects the dehumidification and regeneration performances. The system regeneration temperature should be controlled appropriately for a high energy efficiency based on the operative solution concentration ratio. It is worth noting that the solution concentration ratio plays a considerable role in the system performance. The higher the solution concentration ratio, the better the dehumidification performance. However simultaneously more thermal input power is required for the solution regeneration, and a crystallization risk in the normal operating temperature range should be noted as well. The system mass balance between the dehumidifier and regenerator is crucial for the system steady operation. Under the investigated steady operating condition, the supply air temperature of 20.4°C and system COP of 0.70 are achieved at a solution concentration ratio of 36%.

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Recent developments in solar assisted liquid desiccant evaporative cooling technology—A review

Cited by 98 publications

References 51 publications

Comparison of Liquid Desiccants for Air Cooling Systems Using Wetted Wall Column

Comparison of Liquid Desiccants for Air Cooling Systems Using Wetted Wall Column

Thermodynamics and economics of liquid desiccants for heating, ventilation and air-conditioning – An overview

Performance assessment of a membrane liquid desiccant dehumidification cooling system based on experimental investigations

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