An Adsorptive Desiccant Cooling Using Honeycomb Rotor Dehumidifier.

Jin, Weili; Kodama, Akio; Goto, Motonobu; Hirose, Tsutomu

doi:10.1252/jcej.31.706

Cited by 17 publications

(3 citation statements)

References 14 publications

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“…Studies of solid-desiccant air conditioning systems have been supported by experimental results [31][32][33]. Others are based on mathematical models that incorporate the behavior of the desiccant device as experimentally obtained [34,35], taken from manufacturer's data [36], or otherwise using specific modeling software [37,38].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Cyclic Behavior of a Desiccant Layer of a Hygroscopic Rotor

Ruivo

Costa

Figueiredo

2008

Numerical Heat Transfer, Part A: Applications

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Enthalpy and desiccant wheels are often used in commercial and industrial applications for energy recovery and air dehumidification operations, respectively. The modeling of these hygroscopic rotors is of great relevance either for manufacturer product optimization or for hourly simulations, when integrated in air treatment installations. Some simplified numerical methods have been proposed to predict the behavior of hygroscopic rotors, most of them assuming negligible internal resistances to heat and mass transfer and/or constant properties of the desiccant wall. In this article, a one-dimensional physical model is used to numerically investigate the behavior of an element of a porous desiccant wall that is assumed to belong to a hygroscopic wheel, and is submitted to an adsorption/desorption cyclic operation. The mathematical model is based on the solution of the differential equations of mass and energy conservation inside the porous medium. Moreover, the model was developed to treat the coupled heat and mass transfer phenomena in a detailed way, taking into account specified convective boundary conditions and considering the local and time changes of the medium properties during the sorption processes. The corresponding numerical model is used to perform simulations considering two distinct values of the wall thickness and different durations of the adsorption/desorption cycle. The results lead to a good understanding of the relationship between the characteristics of the sorption processes and the behavior of hygroscopic wheels, and provide guidelines for the wheel optimization, namely of the adsorption/desorption partition of the wheel frontal area.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of the Cyclic Behavior of a Desiccant Layer of a Hygroscopic Rotor

Ruivo

Costa

Figueiredo

2008

Numerical Heat Transfer, Part A: Applications

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“…Enthalpy wheel is one of the efficient instruments for heat management of the building with minimum energy loss and at the same time indoor air quality control. 1 It can exchange the latent heat and sensible heat between outside and inside of the building thereby increasing energy efficiency. The majority of useful energy is stored or released as the latent heat in the case of cooling and heating, respectively.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Water on Mesoporous Silica for Heat Management: Effect of Pore Structure

Hong¹,

Lee²,

Jang³

et al. 2008

j nanosci nanotechnol

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As a potential adsorbent for humidity control, the mesoporous silica, SBA-15, with various pore sizes that was synthesized hydrothermally at different temperatures was examined by measuring the rate of water adsorption under ambient condition, 2.53 kPa H2O and 30 degrees C. The adsorption saturation quantity and the diffusion coefficient of water were changed consistently with the micropore fraction in SBA-15 obtained from the t-plot method. The diffusion of water into the SBA-15 was very similar to that on either zeolite A or Y because of the presence of complimentary pore.

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“…Seibu Giken Co., Ltd., Fukuoka, Japan, which the present authors are concerned in, had commercialized a honeycomb rotor dehumidifier in 1984 as an extension of their corrugation technology developed in cumulative heat exchangers some years before they put the VOC concentrators into market in 1988. The dehumidifier was applied later to the adsorptive desiccant cooling system, and the heat/mass transfer properties of the dehumidifier itself and the cooling system have been analyzed by Kodama et al, − Okano et al, and Jin et al Recently, Matsukuma et al , analyzed a potential application of the honeycomb rotor adsorber to CO 2 recovery other than dehumidification. As for the thermal swing VOC concentrator, thermal effects for a cyclic adsorption process have been discussed by Ko et al, Gales et al, Sullivan et al, Nastaj et al., and Matsukuma et al , However, they discussed particle packed beds 8-11 instead of honeycomb type, a combined temperature-pressure swing 11 or numerical simulation, but not experimental works. − No papers based on experimental data seem available except for a conference paper by Kuma et al and a short paper by Mitsuma et al within the authors' scope.…”

Section: Introductionmentioning

confidence: 99%

Performance of VOC Abatement by Thermal Swing Honeycomb Rotor Adsorbers

Yamauchi

Kodama

Hirose

et al. 2007

Ind. Eng. Chem. Res.

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Fine powder of hydrophobic high silica zeolite was solidified with silica sol in the void of a 0.2 mm thick ceramic fiber sheet fabricated into a honeycomb structure, typically with 3.2 mm pitch × 1.7 mm height. The honeycomb rotor of adsorbent was applied to the VOC abatement system operating with thermal swing adsorption. Dependence of the removal efficiency of VOC on various variables was investigated for a test honeycomb rotor of 300 mm in diameter. The following operating guide was recommended to reach high performance where more than 95% of VOC in the feed gas is removed: superficial velocity of feed air = 2−4 m/s, flow rate ratio of process to regeneration zone = 5−15, relative humidity < 80%, and regeneration air temperature = 180 °C with rotation speed optimized. The optimal rotation speed of the honeycomb rotor was investigated closely, and the result was interpreted in terms of the heat capacity ratio between the honeycomb rotor and the regeneration air stream.

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An Adsorptive Desiccant Cooling Using Honeycomb Rotor Dehumidifier.

Cited by 17 publications

References 14 publications

Numerical Study of the Cyclic Behavior of a Desiccant Layer of a Hygroscopic Rotor

Numerical Study of the Cyclic Behavior of a Desiccant Layer of a Hygroscopic Rotor

Adsorption of Water on Mesoporous Silica for Heat Management: Effect of Pore Structure

Performance of VOC Abatement by Thermal Swing Honeycomb Rotor Adsorbers

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