Experimental Investigations on the Thermal Effects in Packed Bed Liquid Desiccant Dehumidifiers

Sadasivam, M.; Balakrishnan, A.

doi:10.1021/ie00030a027

Cited by 11 publications

(4 citation statements)

References 7 publications

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“…Therefore, this study not only proves that the vapor pressure of a desiccant solution is one of the important parameters for predicting the system effectiveness but also provides the important data of vapor pressure for the potential desiccant solutions. et al, 1995); (1) Ceramic Berl Saddles-LiCl (Sadasivam and Balakrishnan, 1994).…”

Section: Ln[p(kpa)]mentioning

confidence: 99%

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Vapor Pressures of the Aqueous Desiccants

Chung

Luo

1999

J. Chem. Eng. Data

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The vapor pressures of the aqueous desiccants lithium chloride, lithium bromide, calcium chloride, ethylene glycol, propylene glycol, and their mixtures were measured at their typical operating concentrations and at temperatures from 298 K to 313 K. The experimental data were fitted to an Antoine type of equation, ln[P(kPa)] ) A -B/[T(K) + C], where A, B, and C are constants and are concentration dependent. Vapor pressure data were further used to predict the effectiveness of dehumidification in liquid desiccant dehumidifiers.

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Section: Ln[p(kpa)]mentioning

confidence: 99%

“…Figure 2. Comparison of predicted and experimental effectiveness for different desiccants and packings: (9) Polypropylene Flexi rings-TEG (Chung et al, 1995); (b) Plastic Pall rings-LiCl (Chung, 1997); (2) Polypropylene Jaeger Tri-Packs-TEG; (1) Ceramic Berl Saddles-LiCl(Sadasivam and Balakrishnan, 1994).…”

mentioning

confidence: 99%

Vapor Pressures of the Aqueous Desiccants

Chung

Luo

1999

J. Chem. Eng. Data

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“…The driving force for mass transfer between the air and the desiccant depends on the difference between water partial pressure in the air and the water partial pressure above the desiccant. The dehumidification and regeneration processes can be accomplished using equipment such as a finned-tube surface in a column [2][3][4], spray tower [5,6], or packed tower [7][8][9][10][11][12][13][14][15]. Out of three basic configurations, packed tower configuration has received more attention because of its large rate of heat and mass transfer per unit volume, thus lending them to compact design.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of an aqueous desiccant mixture system: Air dehumidification and desiccant regeneration

Al‐Farayedhi

Gandhidasan

Antar

et al. 2005

Proceedings of the Institution of Mechanical Engineers, Part A:

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This article presents the results of an experimental study on the performance of a structured packing dehumidifier and the regenerator system. The system is tested using different proportions of an aqueous desiccant mixture of calcium chloride and lithium chloride solutions with an overall concentration of 40 wt%. The instantaneous effectiveness and the time-average effectiveness of the dehumidification process as well as the regeneration process are defined for the hybrid cooling system. It is found that as the lithium chloride content in the solution increases, the effectiveness of the dehumidifier as well as the regenerator increases. Moreover, the regeneration of the lithium chloride solution is found to be more effective than that of calcium chloride solution. The dehumidifier effectiveness using the desiccant mixture of 20 wt% CaCl 2 and 20 wt% LiCl is found to be close to that of 45 wt% solution of calcium chloride and improves by 80 per cent over the 40 wt% solution of calcium chloride.

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“…Chung et al Sadasivan and Balakrishnan discussion of the mass Gandhidasan et al transfer coefficient Chung et al …”

Section: Introductionmentioning

confidence: 99%

Effects of Marangoni Convection on the Mass Transfer Performance in a Packed-Bed Absorber

Chung

Lai

2001

Ind. Eng. Chem. Res.

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The process of absorbing water vapor into triethylene glycol (TEG) solutions is achieved in two steps. In the first step, water vapor is condensed into water droplets on the gas-liquid interface. The second step involves the dissolution of water droplets into the TEG solution as a result of the change in surface tension in the surface thin film. This study is focused on the effects of the surface tension gradient on mass transfer performance of the absorption process. An investigation of the disturbance induced by the surface tension gradient and an evaluation of the mass transfer behavior were conducted. As noted, the phenomenon of fluid flow in the surface thin film due to the surface tension gradient is termed the Marangoni effect, and the induced convection is usually termed Marangoni convection. To discuss the relationship between the Marangoni effect and the mass transfer performance, the surface tension of the liquid desiccant was measured under different temperatures and concentrations during experimental runs. The conventional mass transfer correlation was modified by using the term of the M index, which combines the surface tension gradient and the driving force of mass transfer to explain Marangoni effects. This improves the average error between predicted values and experimental data significantly.

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Experimental Investigations on the Thermal Effects in Packed Bed Liquid Desiccant Dehumidifiers

Cited by 11 publications

References 7 publications

Vapor Pressures of the Aqueous Desiccants

Vapor Pressures of the Aqueous Desiccants

Experimental study of an aqueous desiccant mixture system: Air dehumidification and desiccant regeneration

Effects of Marangoni Convection on the Mass Transfer Performance in a Packed-Bed Absorber

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