Design and performance evaluation of a multilayer fixed-bed binder-free desiccant dehumidifier for hybrid air-conditioning systems: Part II – Theoretical analysis

Hsu, Wei-Lun; Paul, Soumyadeep; Shamim, Jubair A.; Kitaoka, Kenji; Daiguji, Hirofumi

doi:10.1016/j.ijheatmasstransfer.2017.09.080

Cited by 17 publications

(4 citation statements)

References 22 publications

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“…Hsu et al [56] and Lee et al [57] discuss the application of a composite Langmuir-Sips isotherm on water and organic compounds, respectively. Lee et al [57] employs this model as it can represent equilibrium data by Langmuir isotherm at low pressure and Sips isotherm at moderate pressure to account for capillary condensation.…”

Section: Langmuir-sips Modelmentioning

confidence: 99%

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Insights into the S-shaped sorption isotherms and their dimensionless forms

Inglezakis

Poulopoulos

Kazemian

2018

Microporous and Mesoporous Materials

104

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Isotherms are of paramount importance for the interpretation of adsorption and ion exchange mechanisms, and the design of separation and catalytic processes. Although the literature on sorption isotherms is rich, most of experiments and models employed are limited to systems that obey simple equilibrium isotherms, such as linear, favorable or unfavorable types. This paper deals with the rather overlooked S-shaped isotherms and their dimensionless forms, which is of great importance for modeling of separation processes and interpretation of equilibrium data. A review on the physical significance and applications of S-shaped isotherms in adsorption and ion exchange process is also presented.

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Section: Langmuir-sips Modelmentioning

confidence: 99%

“…The Langmuir-Sips equation finds application also in the adsorption of vapors of polar and nonpolar organic compounds on mesoporous silicate and the water adsorption on a silicabased high-purity spherical gel [56,57]. The latter is a Type-V isotherm, as shown in Figure 15.…”

Section: Langmuir-sips Modelmentioning

confidence: 99%

Insights into the S-shaped sorption isotherms and their dimensionless forms

Inglezakis

Poulopoulos

Kazemian

2018

Microporous and Mesoporous Materials

104

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“…As previously described, the adsorption isotherms for most of the conventional isotherm models are applicable either only in a very limited pressure range or a wide range of pressures with limited prediction accuracy, limiting their utility in adsorption-isotherm modeling. Therefore, a hybrid isotherm model serves as an alternative, overcoming the aforementioned drawbacks of the conventional isotherm model, and several studies have been conducted by implementing the hybrid isotherm model. ,− In this study, a hybrid isotherm model consisting of the Langmuir and Sips equations was proposed. The Langmuir isotherm is the simplest isotherm model that is valid for describing micropore filling and monolayer adsorption.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Isotherm Model for Analyzing the Adsorption Characteristics of Water Vapor to Commercially Available Silica Gel Adsorbents for Adsorption Desalination Applications

Woo

Lee²,

Ji³

et al. 2021

J. Chem. Eng. Data

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In adsorption desalination applications, adsorption isotherms are considered to be a crucial factor, significantly impacting performance. From this perspective, a number of isotherm models have been implemented to describe the adsorption characteristics of an adsorbent. However, conventional isotherm models can produce significant discrepancies in predictions of anomalous adsorption isotherms under specific operating conditions (e.g., in the presence of polar or nonpolar adsorbates). In this study, a hybrid isotherm model consisting of Langmuir and Sips isotherms was proposed. With this model, optimal compatibility is demonstrated with the adsorption isotherms of four different commercial silica gels. First, the thermophysical properties of silica gel were analyzed using nitrogen adsorption and desorption isotherms at 77 K; then, adsorption isotherms of water vapor were evaluated. The results of the hybrid isotherm model were compared with those of the conventional isotherm models (i.e., Toth and Dubinin−Astakhov) at relative pressures ranging from 0 to 0.9 at temperatures ranging from 30 to 70 °C. The hybrid isotherm model demonstrated good agreement with the adsorption data measured for all silica gels. The coefficient of determination for the hybrid isotherm model was found to be higher than 0.99 for all silica gels, unlike the coefficients for the conventional isotherm models. The hybrid isotherm model also exhibited the lowest average relative error and maximum relative error.

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“…11 The desiccant air-conditioning (DAC) has showed reasonable cooling effect in humid climatic conditions. [12][13][14][15][16][17][18] A typical DAC system comprises of desiccant dehumidification unit (to achieve latent load of air-conditioning (AC)) and a low-cost cooling unit preferably evaporative cooling (to achieve sensible load of AC). Therefore, it controls latent and sensible load of AC distinctly.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of desiccant dehumidification and air-conditioning system for energy-efficient storage of dried fruits

Mahmood

Sultan

Miyazaki

2019

Building Services Engineering Research and Technology

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The ideal storage zones of dried fruits in comparison with dried foods and feeds are established on the psychrometric chart. The study investigates the combined effect of the desiccant dehumidification and Maisotsenko-Cycle evaporative cooling for the dried fruits storage. Two configurations of desiccant air-conditioning systems (S-I and S-II) are proposed, and their performance is evaluated under the ambient conditions of Fukuoka, Japan. It is established on the basis of parametric and thermodynamic analysis of both the system configurations (S-I and S-II) that S-II could yield better system performance. The psychrometric evaluation of S-II revealed that it can provide the optimal conditions for the storage of dried fruits at low regeneration temperature. However, modification in the proposed system configuration (S-II) is suggested for the storage of dried foods and feeds. Practical application: Conventional dehumidification and air-conditioning options are either expensive or inefficient for dried fruit storage buildings. The study provides a way forward of using thermally driven desiccant systems which are energy-efficient and environment-friendly. Worldwide, the building industries are actively involved in the development of such systems but their application for dried fruit storage buildings are not explored in detail. Therefore, the study provides thermodynamic details of dried fruits storage in relation with experimental evaluation of desiccant and evaporative cooling systems. Provision of such systems to the storage buildings will provide distinct control of humidity and temperature for optimal storage.

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Design and performance evaluation of a multilayer fixed-bed binder-free desiccant dehumidifier for hybrid air-conditioning systems: Part II – Theoretical analysis

Cited by 17 publications

References 22 publications

Insights into the S-shaped sorption isotherms and their dimensionless forms

Insights into the S-shaped sorption isotherms and their dimensionless forms

Adsorption Isotherm Model for Analyzing the Adsorption Characteristics of Water Vapor to Commercially Available Silica Gel Adsorbents for Adsorption Desalination Applications

Experimental evaluation of desiccant dehumidification and air-conditioning system for energy-efficient storage of dried fruits

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