Experimental investigation on the performance of radial flow desiccant bed using activated alumina

Abd-Elrahman, Walaa; Hamed, Ahmed M.; El-Emam, Salah H.; Awad, M. M.

doi:10.1016/j.applthermaleng.2011.04.041

Cited by 33 publications

(18 citation statements)

References 5 publications

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“…Desiccants can be selected from inorganic materials such as silica gels (SGs), 10−13 zeolites (molecular sieves), 13,14 activated alumina, 15−17 to organic desiccants such as porous/activated carbons. 12,17,18 Also, hybrid substrates such as synthesized silica gel-composite materials 19−21 and metal–organic frameworks (MOFs) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Water Vapor Adsorption–Desorption Behavior of Surfactant-Coated Starch Particles for Commercial Energy Wheels

et al. 2019

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This study reports on the adsorption (dehumidification)–desorption (humidification) behavior of cetylpyridinium bromide (CPB) coated starch particles (SPs), denoted as SP-CPB, as a potential desiccant material for air-to-air energy exchangers. CPB is a cationic surfactant with antibacterial activity that can be used to modify the surface properties of SPs, especially at variable CPB loading levels (SP-CPB0.5, SP-CPB2.5, and SP-CPB5.0, where the numeric suffix represents the synthetic loading level of CPB in mM). The SP-CPB0.5 sample displayed optimal surface area and pore structure properties that was selected for water sorption isotherm studies at 25 °C. The CPB-coated SPs sample (SP-CPB0.5) showed an improved water vapor uptake capacity compared to unmodified starch (SPs) and other desiccant systems such as high amylose starch (HAS15) and silica gel (SG13). Single-step and cyclic water vapor sorption tests were conducted using a small-scale exchanger coated with SP-CPB0.5. The calculated latent effectiveness values obtained from direct measurements using cyclic tests (65.4 ± 2%) agree closely with the estimated latent effectiveness from single-step tests (64.6 ± 2%) at controlled operating conditions. Compared to HAS15- and SG13-coated exchangers, the SP-CPB0.5-coated exchanger performed much better at controlled operating conditions, along with improved longevity due to the CPB surface coating. The presence of CPB did not attenuate the uptake properties of native SPs. Latent effectiveness of SP-CPB0.5-coated exchanger was enhanced (5–30% higher) over that of the SG13- or HAS15-coated exchangers, according to the wheel angular speed. This study reports on a novel and sustainable SP-CPB0.5 material as a promising desiccant coating with tunable uptake and surface properties with potential utility in air-to-air energy exchangers for ventilation systems.

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Section: Introductionmentioning

confidence: 99%

Water Vapor Adsorption–Desorption Behavior of Surfactant-Coated Starch Particles for Commercial Energy Wheels

et al. 2019

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“…It has a surface area of 150-500 m 2 /g with pore sizes ranging between 1.5 and 6 nm and heat of adsorption nearly equals 3000 kJ/kg [23]. Many times it has been used for desiccant dehumidification and gives interesting results [32][33][34].…”

Section: Activated Aluminamentioning

confidence: 99%

An overview of solid desiccant dehumidification and air conditioning systems

Sultan

El-Sharkawy

Miyazaki

et al. 2015

Renewable and Sustainable Energy Reviews

219

111

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“…Dupont et al [6] studied the adsorption and desorption properties of silica gel and activated alumina and reported that the regeneration temperature of activated alumina is higher than silica gel. Abd-Elrahman et al [7] tested the transient desorption characteristics of activated alumina using radial flow desiccant bed at different regeneration temperatures (110–198 °C). Hamad et al [8] stated that the high regeneration temperatures (110–198 °C) may limit the applications of activated alumina.…”

Section: Introductionmentioning

confidence: 99%

Experimental and predictive study on the performance and energy consumption characteristics for the regeneration of activated alumina assisted by ultrasound

Mou

Chen

2021

Ultrasonics Sonochemistry

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Experimental investigation on the performance of radial flow desiccant bed using activated alumina

Cited by 33 publications

References 5 publications

Water Vapor Adsorption–Desorption Behavior of Surfactant-Coated Starch Particles for Commercial Energy Wheels

Water Vapor Adsorption–Desorption Behavior of Surfactant-Coated Starch Particles for Commercial Energy Wheels

An overview of solid desiccant dehumidification and air conditioning systems

Experimental and predictive study on the performance and energy consumption characteristics for the regeneration of activated alumina assisted by ultrasound

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