Adsorption cooling system employing granular activated carbon–R134a pair for renewable energy applications

Askalany, Ahmed A.; Saha, Bidyut Baran; Ismail, Ilham Ameera

doi:10.1016/j.ijrefrig.2012.11.009

Cited by 50 publications

(31 citation statements)

References 25 publications

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“…All the starting materials including solvents used in the synthesis were purchased from Aldrich Chemicals and were used without further purification. The powder X-ray diffraction measurements were performed on Bruker AXS D 8 Discover powder diffractometer at 45 kV, 200 mA for Cu Ka (l ¼ 1.5406 Å) and the purity and homogeneity of the bulk samples were determined by comparison of the simulated powder patterns which were calculated using Mercury 3.1. All thermogravimetric analysis experiments were performed using Netzsch TG209 F1 under a N 2 atmosphere from 25 to 500°C at a rate of 5°C min À 1 .…”

Section: Methodsmentioning

confidence: 99%

“…Sorbents examined for fluorocarbon-based adsorption chillers have thus far been limited to activated carbon 7,8 and zeolites 9 . Although the literature on gas adsorption in MOFs is very extensive [10][11][12][13][14][15][16][17][18][19] , fluorocarbon adsorption has been limited to zeolites and activated carbons [7][8][9] . The adsorption behaviour of the MOFs with high capacity at very low vapor pressures suggests MOFs can, in principle, be used in fluorocarbon-based adsorption heat pumps, separation of fluorocarbons from azeotrope mixture, removal of environmentally hazardous gases from atmosphere.…”

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confidence: 99%

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Fluorocarbon adsorption in hierarchical porous frameworks

et al. 2014

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Metal-organic frameworks comprise an important class of solid-state materials and have potential for many emerging applications such as energy storage, separation, catalysis and bio-medical. Here we report the adsorption behaviour of a series of fluorocarbon derivatives on a set of microporous and hierarchical mesoporous frameworks. The microporous frameworks show a saturation uptake capacity for dichlorodifluoromethane of 44 mmol g À 1 at a very low relative saturation pressure (P/P o ) of 0.02. In contrast, the mesoporous framework shows an exceptionally high uptake capacity reaching 414 mmol g À 1 at P/P o of 0.4. Adsorption affinity in terms of mass loading and isosteric heats of adsorption is found to generally correlate with the polarizability and boiling point of the refrigerant, with dichlorodifluoromethane 4chlorodifluoromethane 4chlorotrifluoromethane 4tetrafluoromethane 4methane. These results suggest the possibility of exploiting these sorbents for separation of azeotropic mixtures of fluorocarbons and use in eco-friendly fluorocarbon-based adsorption cooling.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Fluorocarbon adsorption in hierarchical porous frameworks

et al. 2014

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“…The specific area of activated carbon is between 500 and 1500 m 2 /kg [4]. Table 1 shows the thermo-physical properties of granule activated carbon [11,12].…”

Section: Methodsmentioning

confidence: 99%

“…The debate is on whether to continue with hydro fluorocarbon (HFC) refrigerants or if a time has come to switch fully to natural refrigerants such as ammonia and carbon dioxide [12]. In addition, the even flammable hydro fluorocarbon is gaining prominence in the wake of global warming issue that is rocking the world.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Granular Activated Carbon/R-134a Pair for Adsorption Cooling System Applications

Attalla¹,

Sadek²

2014

JPEE

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The objective of this study is to investigate the adsorption characteristics of granular activated carbon GAC/R134a pair in the temperature range of 20˚C -60˚C and pressure up to 10 bars. The Dubinin-Astakhov adsorption equilibrium model is fit to experimental data with acceptable error limit. The pressure-temperature-concentration (P-T-X) diagram of the pair is also presented. The isosteric heat of adsorption of R-134a on activated carbon has been calculated using the Clausius-Clapeyron equation as a function of adsorption capacity. The maximum adsorption capacity was found to be 1.92 kgR134a/kg carbon at 20˚C after 1200 s. The experimental results also show that the increase of heat transfer area improves the adsorption capacity per kg of adsorber, which leads to the design of a finned tubes heat exchanger adsorption unit.

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Size‐Selective Capture of Fluorocarbon Gases and Storage of Volatile Halogenated Organic Vapors with Low Boiling Points by Molecular‐Scale Cavities of Crystalline Pillar[n]quinones

Ohtani,

Onishi,

Wada

et al. 2023

Adv Funct Materials

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Fluorocarbon gases are regarded as one of the largest contributors to serious environmental problems such as ozone‐depletion and global warming, and thus, the development of reclamation technologies is in great demand for reducing emission of such harmful compounds. So far, porous materials such as zeolites, activated carbons, and metal‐organic frameworks (MOFs) have been examined as solid‐state absorbents for fluorocarbon gases. However, such porous materials often suffer from a lack of size‐selectivity in fluorocarbon gas uptakes due to the large‐sized cavities (>1 nm). Herein, it is reported that macrocyclic pillar[n]quinones (P[n]Q, n = 5 or 6) in crystalline state show size‐selective uptake for fluorocarbon gases owing to their molecular‐scale cavities (<1 nm). The P[n]Q also show uptake behaviors for volatile halogenated organic compounds (VHOCs), which are highly toxic. Interestingly, the volatilities of VHOCs within the 1D channels of P[5]Q are drastically reduced compared with those of the bulk VHOC solvents. Experimental results and computational analyses revealed that the excellent storage abilities of the crystalline P[n]Q are a synergic result of their electron‐deficient macrocyclic scaffolds and the basic carbonyl oxygen atoms on their rims.

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Adsorption cooling system employing granular activated carbon–R134a pair for renewable energy applications

Cited by 50 publications

References 25 publications

Fluorocarbon adsorption in hierarchical porous frameworks

Fluorocarbon adsorption in hierarchical porous frameworks

Experimental Investigation of Granular Activated Carbon/R-134a Pair for Adsorption Cooling System Applications

Size‐Selective Capture of Fluorocarbon Gases and Storage of Volatile Halogenated Organic Vapors with Low Boiling Points by Molecular‐Scale Cavities of Crystalline Pillar[n]quinones

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