Liquid desiccant materials and dehumidifiers – A review

Rafique, M. Mujahid; Gandhidasan, P.; Bahaidarah, Haitham M. S.

doi:10.1016/j.rser.2015.11.061

Cited by 232 publications

(98 citation statements)

References 101 publications

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“…The liquid desiccant cooling system (LDCS) has been considered as a promising alternative to the traditional vapor compression cooling system (VCS) due to its various advantages, such as being energy efficient and environmentally friendly [1,2]. Unlike the VCS, which is heavily dependent on electricity consumption, the LDCS can take advantage of low grade energy, such as solar energy, during the regeneration process of liquid desiccant.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Regeneration and Corrosion Characteristics of an Anodized Aluminum Plate Regenerator

et al. 2018

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Abstract:The traditional vapor compression cooling system (VCS) has been criticized for its heavy reliance on electricity consumption and limited control ability of humidity. Compared with the VCS, the liquid desiccant cooling system (LDCS) is more efficient by handling the sensible and latent load separately. The present study investigated the regeneration and corrosion characteristics of an anodized aluminum plate regenerator for the first time. Comparative tests were conducted to present the regeneration and corrosion characteristics of the normal and anodized regenerator. The influence of internal heating on the regeneration performance was also identified. The results showed that the corrosion rate was reduced from 0.0005218 mm/year for normal aluminum to 0.000011 m/year for anodized one under the same operating conditions. However, pitting corrosion was observed at operating conditions with high solution temperature, as the anodized layer of anodized aluminum was damaged due to the high temperature. Compared with the normal aluminum regenerator, the anodized one had an average enhancement of 24% and 23.7% in terms of regeneration rate and effectiveness, respectively. It was attributed to the increment of surface energy from 26.4 mN/m for normal aluminum to 47.6 mN/m for anodized plate. Besides, it was found that, compared with adiabatic one, the internally-heated regenerator improved the regeneration rate by 6.0%~38% and the regeneration effectiveness by 6.3%~32% depending on the operating conditions. The advantage of present study is that it can guide the design of anodized aluminum regenerator for LDCS.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Regeneration and Corrosion Characteristics of an Anodized Aluminum Plate Regenerator

et al. 2018

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“…The desiccant material is regenerated using hot air so that the cycle can be repeated. After the dehumidification of the process air, the evaporative cooler is used to lower the temperature according to the desired comfort conditions [5]. Desiccant cooling system is an effective and cost-efficient way to provide comfort in hot and humid environments.…”

Section: Introductionmentioning

confidence: 99%

A Liquid Desiccant Enhanced Two Stage Evaporative Cooling System—Development and Performance Evaluation of a Test Rig

et al. 2017

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Desiccant technology is found to be a good alternative to conventional cooling systems. It can provide better thermal comfort under hot and humid climatic conditions. The major component of a liquid desiccant cooling system is the desiccant dehumidifier which controls the latent cooling load. In this paper, a newly developed liquid desiccant enhanced evaporative cooling system has been tested experimentally. The effects of ambient conditions and other parameters on the performance of the system are investigated. The system performance curves which help to determine the air outlet conditions and coefficient of performance (COP) of the system are drawn for a wide range of ambient air humidity ratios (0.010-0.026 kg/kg), ambient air temperature (25-40 • C), process air flow rate (1.5-8.0 kg/m 2 ·s), regeneration air flow rate (1.5-4.5 kg/m 2 ·s), and regeneration temperature (55-85 • C). The results showed that better supply air conditions are achieved for hot and humid climatic conditions with effectiveness of the system largely dependent on process and regeneration air flow rates, regeneration temperature, and humidity ratio of process air. The dehumidification performance is increased by 62% for a change of ambient air humidity ratio from 0.01 to 0.025 kg/kg. The thermal coefficient of performance improved by 50% for the above variation in humidity ratio. This shows that such thermally activated systems are feasible options for hot and humid climatic conditions as indicated by better performance under these conditions.

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“…Compared with the solid desiccant system, the liquid desiccant dehumidification (LDD) system has been a more promising and economical choice due to its flexibility in utilizing low-grade energy sources [5] and capability of independent humidity and temperature controls [6]. Moreover, the LDD system is capable to provide high quality supply air as liquid desiccants can filter the bacteria, microbial contaminations, viruses and moulds [7]. In terms of energy conservation, 19% reduction in the annual primary energy consumption could be achieved with an LDD system for an office building in Miami, Florida [8].…”

Section: Introductionmentioning

confidence: 99%

“…Better mass transfer potential in the regeneration process is obtained with CaCl2 solution compared to LiCl solution under the same operating condition [14]. Besides, weak organic acid salts such as potassium and sodium formate are good alternatives [7] and ionic liquids become promising for the specific achievable dew point temperature at a comparatively lower driving temperature [13]. With respect to the regeneration of liquid desiccant solution, it can be performed by either heating dilute solution or inlet air to the required regeneration temperature.…”

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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Liquid desiccant materials and dehumidifiers – A review

Cited by 232 publications

References 101 publications

Investigation on the Regeneration and Corrosion Characteristics of an Anodized Aluminum Plate Regenerator

Investigation on the Regeneration and Corrosion Characteristics of an Anodized Aluminum Plate Regenerator

A Liquid Desiccant Enhanced Two Stage Evaporative Cooling System—Development and Performance Evaluation of a Test Rig

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

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