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

Attalla, M.; Sadek, S.

doi:10.4236/jpee.2014.22002

Cited by 24 publications

(12 citation statements)

References 27 publications

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“…This work aims to study the capture by adsorption of the three most commonly employed pure F‐gases in domestic refrigeration (R‐32, R‐125, and R‐134a). The adsorption of these gases on activated carbons (ACs), zeolites, or metal–organic frameworks (MOFs) at various temperature and pressure ranges has been reported in the literature . Even though MOFs present in general higher adsorption capacities, ACs are the most commonly used adsorbents in many industrial processes due to their large micropore and mesopore volumes, high surface area, variety of surface functional groups, low cost, and wide range of available morphologies …”

Section: Introductionmentioning

confidence: 99%

“…The adsorption of R‐32, R‐125, R‐134a, and of commercial refrigerants containing these F‐gases on other ACs has been already studied in the literature. However, to the best of our knowledge, this work is the first publication reporting on a systematic study of the adsorption of those three pure F‐gases on four different ACs with different porous characteristics in order to select the best material for the separation of commercial refrigerants.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of fluorinated greenhouse gases on activated carbons: evaluation of their potential for gas separation

Sosa

Malheiro

Ribeiro

et al. 2020

J of Chemical Tech & Biotech

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Background The increasing awareness of the release of fluorinated gases (F‐gases) into the atmosphere is instigating the development of techniques to capture them from refrigerants. In this work, the adsorption of difluoromethane (R‐32), pentafluoroethane (R‐125), and 1,1,1,2‐tetrafluoroethane (R‐134a) on four different activated carbons (ACs) is studied. Additionally, the selectivity of the ACs for the components of commercial refrigerants, R‐410A and R‐407F, is evaluated. Results The estimation of the density of the adsorbed phase as a function of temperature allows the experimental fractional loading of each F‐gas on any of the ACs to be correlated as a temperature‐independent function of its reduced pressure, which is described by Tóth or dual‐site Langmuir equations or as an exponential function of the adsorption potential under the framework of the Adsorption Potential theory (APT). It is shown that the APT can be generalized with excellent accuracy to the systems studied if an adsorbate‐dependent affinity coefficient is used as a shifting factor to bring the characteristic curves of all F‐gases into a single one for each AC. R‐32 is the F‐gas most adsorbed by all adsorbents, followed by R‐134a, and by R‐125. All ACs are selective for R‐125 in R‐410A commercial refrigerants, especially at lower pressures. Additionally, all ACs are selective for R‐125 and R‐134a over R‐32 in R407‐F commercial refrigerant. Conclusion The utilization of ACs for adsorption of the three most used F‐gases is promising. By selecting ACs with different porous characteristics, it is possible to evaluate their influence on the selectivity for the components of different commercial refrigerants. © 2020 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of fluorinated greenhouse gases on activated carbons: evaluation of their potential for gas separation

Sosa

Malheiro

Ribeiro

et al. 2020

J of Chemical Tech & Biotech

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“…Fig. 3 shows Isobaric adsorption of ACF/Methanol pairs [9]. The adsorbent temperature are gradually reduced from 80° C to 15° C at 68 cm of hg vacuum pressure and measure the level of methanol in evaporator tube.…”

Section: Resultsmentioning

confidence: 99%

“…They found adsorption capacity of 0.36 ml/gm with AC-5060 [8]. M.Attalla and S.Sadek found Maximum adsorption capacity 1.92 kg R134a/ kg Granular AC at 20 °C after 1200 sec and observed adsorption uptake are reduces with rise in temperature due to generation of heat of Adsorption [9].Ibrahim El-Sharkawy et al investigated the adsorption uptake (kg.kg-1) of 1.2 for parent Maxsorb III/ethanol, 1 for KOH-H2 treated Maxsorb III/ethanol And 1.1 MIL101Cr/ethanol by using magnetic suspension adsorption measurement unit (MSB-VG-S2), BEL Japan [11]. Jian Sun and Sunita Satyapal, experimentally investigate Adsorption capacities and Heat of adsorption of Coconut shell based AC & ACF.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on adsorption capacity of ACF–methanol pairs for cooling application

Bhargav¹,

Ramani²,

Reddy³

2017

International Journal of Ambient Energy

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Solar cooling technology is also known as popular among other conventional cooling technology due to increment in global warming effects. In solar cooling technology, Solar powered adsorption refrigeration system has potential to compete with other non-conventional cooling technology i.e. Absorption, PV based, Waste heat driven and Biogas cooling technology. The main objective of this research work is to investigate the adsorption capacity of methanol onto activated carbon fiber in the temperature range of 15°C-80 °C during isobaric adsorption process. To correlate adsorption characteristics data of the experiment, the DubininAstakhov equation is used. From series of experiments, it has found that, the maximum adsorption capacity found to be 0.44 kg/kg of acf carbon by maintaining packing density of bed is 110 kg/m 3 . The effect of heat generator temperature on adsorption capacity is also studied in this present investigation.

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“…Shmroukh et al experimentally determined maximum adsorption capacity for six different pairs by using activated carbon (powdered and granular type) as an adsorbent with refrigerants that are R134a, R407c, and R507A, at 25°C, 30°C, 35°C, and 50°C adsorption temperatures. Attalla and Sadek, carried out PTX experiments on granular activated carbon (GAC)/R134a system to study adsorption features varying from 20°C to 60°C. Askalany et al conducted experiments to estimate the adsorption characteristics of the GAC/R134a pair.…”

Section: Introductionmentioning

confidence: 99%

Study on a twin‐bed adsorption refrigeration system using R134a‐activated carbon pair

Pinto¹,

Govindasetty²,

Karanam

et al. 2019

Heat Trans. Asian Res.

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A low capacity twin‐bed adsorption refrigeration system has been built with R134a as a refrigerant and activated carbon as the adsorbent. Simple tube‐in‐tube heat exchangers have been fabricated and have been used as the adsorber beds. Activated carbon (granular type) has been filled in the annular space of the inner tube and outer tube. A plate heat exchanger has been used as the condenser and the temperature of cooling water has been maintained between 25°C and 30°C, also the evaporator has been custom designed as per requirements. A mathematical model has also been developed and the results obtained have been found to be comparable. While operating the system in the single‐bed mode a cooling power of 250.4 W has been obtained with a coefficient of performance (COP) of 0.38 with an average evaporator temperature of 18.4°C against a predicted value of 263.7 W with a COP of 0.41. While operating in the twin‐bed mode a cooling power of 281.3 W with a COP of 0.47 with an average evaporator temperature of 17.6°C has been obtained against a predicted value of 294.5 W with a COP of 0.52.

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

Cited by 24 publications

References 27 publications

Adsorption of fluorinated greenhouse gases on activated carbons: evaluation of their potential for gas separation

Adsorption of fluorinated greenhouse gases on activated carbons: evaluation of their potential for gas separation

Experimental investigation on adsorption capacity of ACF–methanol pairs for cooling application

Study on a twin‐bed adsorption refrigeration system using R134a‐activated carbon pair

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