Adsorption Characteristics of Silica Gel + Water Systems

Chua, Hui Tong; Ng, Kim Choon; Chakraborty, Anutosh; Oo, Nay M.; Othman, Mohamed A.

doi:10.1021/je0255067

Cited by 239 publications

(71 citation statements)

References 7 publications

(21 reference statements)

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“…Figure 8 shows the cooling Coefficient Of Performance (COP) calculated for the composite sorbent S6 by a previously developed mathematical model (Cacciola and Restuccia 1995). The same figure reports the COP calculated for the silica gel "Fuji Davison RD"-water as working pair, which is used in commercialized adsorption chillers (Chua et al 2002). It was found that, depending on the operating conditions, the composite sorbent S6 allows to obtain acceptable COP values that are about 15-25% lower than those calculated for the silica gel.…”

Section: Performance Evaluationmentioning

confidence: 81%

Sorption equilibrium of methanol on new composite sorbents “CaCl2/silica gel”

et al. 2007

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This paper presents experimental data on methanol sorption on new composite sorbents which consist of mesoporous silica gels and calcium chloride confined to their pores. Sorption isobars and XRD analysis showed the formation of a solid crystalline solvate CaCl 2 ·2MeOH at low methanol uptake, while at higher uptake the formation of the CaCl 2 -methanol solution occurred. The solution confined to the silica pores showed the sorption properties similar to those of the CaCl 2 -methanol bulk solution. Calorimetric and isosteric analyses showed that the heat of methanol sorption depends on the methanol uptake, ranging from 38 ± 2 kJ/mol for the solution to 81 ± 4 kJ/mol for the solid crystalline phase CaCl 2 ·2MeOH. The above mentioned characterizations allowed the evaluation of the methanol sorption and the energy storage capacities, clearly showing that the optimal applications of these new composite sorbents are the methanol removal from gaseous mixtures, heat storage and sorption cooling driven by low temperature heat.

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Section: Performance Evaluationmentioning

confidence: 81%

Sorption equilibrium of methanol on new composite sorbents “CaCl2/silica gel”

et al. 2007

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“…Indeed, the survey of water vapour adsorption equilibrium data of a number of microporous silica gels and zeolites, suggested for AC (Aristov et al, 2006a;Chua et al, 2002;Choi and Jeong, 2005;Dawoud and Miltkau, 2002;Baker and Kaftanoglu, 2007), (Figure 2(a)) shows rather small variation in uptake for the AC cycle considered. For desorption temperature T des = 85°C the uptake variation for most of the adsorbents is ∆w = 1-2%.…”

Section: Porous Adsorbents Of Water and Methanol Vapourmentioning

confidence: 96%

Adsorptive Air Conditioning Systems Driven by Low Temperature Energy Sources: Choice of the Working Pairs

Gordeeva

Freni

Restuccia

et al. 2007

J. Chem. Eng. Japan

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The performance of an adsorptive air-conditioning cycle driven by low temperature heat (80-85°C) was studied. The analysis rested on the Polanyi potential theory and took into account literature and author's experimental data on sorption equilibrium of various conventional and innovative adsorbents with water and methanol as working fluids. This adsorbent screening is aimed at evaluating the optimal working pairs for this application. The composite sorbent of methanol Lithium Chloride in mesoporous silica gel and the adsorbent of water FAM-Z02 were selected as challenging pairs for severe conditions of heat rejection typical for solar cooling in hot countries and air conditioning in cars.

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“…The adsorbent for water is silica gel (type A), while adsorbents for other refrigerants are activated carbons. The isotherm equations of these refrigerantadsorbent pairs were taken from literatures [6,2,3,1,5]. The calculation of the COP and SCE was based on an adsorption cooling cycle with refrigerant evaporation temperature of 10 • C, adsorption temperature of 30 C, condensation temperature of 30 • C and desorption temperature of 50 C to 100 C. It was assumed that the heat capacity ratio, M hex c hex /(M ac c ac ) equaled to 2, which is a reasonable value for a fin and tube type adsorption heat exchanger.…”

Section: Comparison Of the Theoretical Copmentioning

confidence: 99%

“…By a fitting of measured data with Dubinin-Astakhov (D-A) equation, we obtained adsorption isotherm equation for SAC-2 as in Eq. (6). (6) where, W 0 is 1.98 kg/kg, n is 1.5, and E is 90 kJ/kg.…”

Section: Analysis Of Theoretical Adsorption Cycle Performance With Sac-2mentioning

confidence: 99%

Study toward high-performance thermally driven air-conditioning systems

Miyazaki¹,

Miyawaki²,

Ohba³

et al. 2017

AIP Conference Proceedings

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Abstract. The Adsorption heat pump is a technology for cooling and heating by using hot water as a driving heat source. It will largely contribute to energy savings when it is driven by solar thermal energy or waste heat. The system is available in the market worldwide, and there are many examples of application to heat recovery in factories and to solar cooling systems. In the present system, silica gel and zeolite are popular adsorbents in combination with water refrigerant. Our study focused on activated carbon-ethanol pair for adsorption cooling system because of the potential to compete with conventional systems in terms of coefficient of performance. In addition, activated-ethanol pair can generally produce larger cooling effect by an adsorption-desorption cycle compared with that of the conventional pairs in terms of cooling effect per unit adsorbent mass. After the potential of a commercially available activated carbon with highest level specific surface area was evaluated, we developed a new activated carbon that has the optimum pore characteristics for the purpose of solar or waste heat driven cooling systems. In this paper, comparison of refrigerants for adsorption heat pump application is presented, and a newly developed activated carbon for ethanol adsorption heat pump is introduced.

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Adsorption Characteristics of Silica Gel + Water Systems

Cited by 239 publications

References 7 publications

Sorption equilibrium of methanol on new composite sorbents “CaCl2/silica gel”

Sorption equilibrium of methanol on new composite sorbents “CaCl2/silica gel”

Adsorptive Air Conditioning Systems Driven by Low Temperature Energy Sources: Choice of the Working Pairs

Study toward high-performance thermally driven air-conditioning systems

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