Adsorption kinetics and isotherms of zeolite coatings directly crystallized on fibrous plates for heat pump applications

Atakan, Aylin; Fueldner, Gerrit; Munz, Gunther; Henninger, Stefan K.; Tatlıer, Melkon

doi:10.1016/j.applthermaleng.2013.04.037

Cited by 29 publications

(12 citation statements)

References 16 publications

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“…On the other hand, slightly adverse impacts were observed on the adsorption kinetics, especially after relatively high normalized loadings for the zeolitepolymer composite samples (Atakan et al, 2013). These polyacrylic acid layers were prepared using a solution containing 4% (by weight) of polymer.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Zeolite X Coatings on Soda-Lime Type Glass Plates

Tatlıer

Atalay-Oral

2017

Braz. J. Chem. Eng.

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-The dissolution of glass in highly alkaline reaction mixtures and the impact of this phenomenon on zeolite coating formation were investigated. Coating samples were prepared and characterized by X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEGSEM) and thermogravimetry (TG). It was demonstrated that zeolite X coatings might be prepared on soda-lime glass. Glass dissolved to some degree, up to 2% of its original mass, in the reaction mixtures for the conditions investigated. This dissolution affected the zeolite synthesis taking place on the glass surface, resulting in phases different from those obtained on inert metal surfaces in some cases, especially for the use of reaction mixtures with relatively high Si/Al ratios. The percentage of dissolution of glass plates increased with their decreasing thickness, indicating a surface phenomenon for the dissolution. The stabilities of the coatings, which varied with the synthesis conditions, benefited from the addition of extra thin layers of polyacrylic acid.

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Section: Resultsmentioning

confidence: 99%

Preparation of Zeolite X Coatings on Soda-Lime Type Glass Plates

Tatlıer

Atalay-Oral

2017

Braz. J. Chem. Eng.

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“…The adsorption enthalpy h ads is calculated out of the adsorption potential A p vap , T sorb using the equilibrium description of Siogel and the enthalpy difference between liquid water and water vapor ∆h lv (T sorb ) according to Equation (11). The adsorption potential is defined in Equation (12). The enthalpy of the vapor from the gas phase h vap is calculated with the state variables of the gas phase and the adsorbent temperature.…”

Section: Heat Transfer Model For the Loose Grains Configurationmentioning

confidence: 99%

“…In the last few years, various designs were presented. They can be grouped into three main classes: adsorbent in the form of granules (loose grains configuration) [2,3], binder-based coatings [4][5][6] or adsorbent in form of compact layers, which are directly crystallized on a metal surface [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Advanced Measurement and Simulation Procedure for the Identification of Heat and Mass Transfer Parameters in Dynamic Adsorption Experiments

et al. 2017

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Thermally-driven heat pumps can help to mitigate CO 2 emissions by enhancing the efficiency of heating systems or by driving cooling systems with waste or solar heat. In order to make the thermally-driven systems more attractive for the end consumer, these systems need a higher power density. A higher power density can be achieved by intensifying the heat and mass transfer processes within the adsorption heat exchanger. For the optimization of this key component, a numerical model of the non-isothermal adsorption dynamics can be applied. The calibration of such a model can be difficult, since heat and mass transfer processes are strongly coupled. We present a measurement and simulation procedure that makes it possible to calibrate the heat transfer part of the numerical model separately from the mass transfer part. Furthermore, it is possible to identify the parts of the model that need to be improved. For this purpose, a modification of the well-known large temperature jump method is developed. The newly-introduced measurements are conducted under an inert N 2 atmosphere, and the surface temperature of the sample is measured with an infrared sensor. We show that the procedure is applicable for two completely different types of samples: a loose grains configuration and a fibrous structure that is directly crystallized.

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“…Atakan et al 34 Zeolite/water Zeolite integrated with metal improves heat transfer quantity. Also, direct crystallization of zeolite on¯brous or non¯brous surface minimizes heat transfer resistance at zeolite metal interface.…”

Section: Mesoporous Silicamentioning

confidence: 99%

A Review on Working Pair Used in Adsorption Cooling System

Ugale

Pitale

2015

Int. J. Air-Cond. Ref.

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Adsorption cooling system¯nd its application in refrigeration, air conditioning, chiller, Ice making, etc. It uses thermal energy as driving force. Adsorption systems are environmental friendly (zero global warming potential and ozone depleting potential) and also eliminates use of compressor and minimize vibration problem. So it can be used as substitute for conventional vapor compression refrigeration system or vapor absorption system. The adsorption generally classi¯ed in two types as physical adsorption (due to weak van der waal forces) and chemical adsorption (chemical reaction between adsorbent and adsorbate form new molecules). The working pair of adsorber and adsorbate play vital role in the performance of adsorption system. Activated carbon, zeolite, silica gel are commonly used adsorber and water, ammonia, methanol and ethanol can be used as adsorbate. The poor heat and mass transfer performance of adsorption is major challenge for researchers. The heat transfer performance of adsorption system can be increased by increasing heat transfer area of adsorber bed i.e., design of new adsorber bed, while mass transfer performance is improved by use of new adsorbent with higher sorption rate. Composite adsorber solve the problem of heat and mass transfer performance of chemical adsorbents and adsorption quantity of physical adsorbents by combination of chemical and physical adsorbent but it can add some limitation with it. In this paper, various adsorption pair, their selection, design of adsorber bed, methods to improve thermal performance of adsorber bed is reviewed with their properties, advantages and limitations.

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Adsorption kinetics and isotherms of zeolite coatings directly crystallized on fibrous plates for heat pump applications

Cited by 29 publications

References 16 publications

Preparation of Zeolite X Coatings on Soda-Lime Type Glass Plates

Preparation of Zeolite X Coatings on Soda-Lime Type Glass Plates

Advanced Measurement and Simulation Procedure for the Identification of Heat and Mass Transfer Parameters in Dynamic Adsorption Experiments

A Review on Working Pair Used in Adsorption Cooling System

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