Abstract
The objective of this study is to investigate the adsorption characteristics of granular activated carbon GAC/R-134a pair in the temperature range of 20℃ - 60℃ 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℃ 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.
Highlights
Over the past two decades, adsorption refrigeration system has gained considerable interest due to its ability to combat ozone depletion problem that was caused by the utilization of CFCs and HCFCs in cooling system [1,2]
This study investigated the adsorption characteristics of granular activated carbon (GAC)/R-134a Pairs for cooling system applications
It is well known that the adsorption cooling potential of adsorbent is determined by both maximum adsorption capacity and the rate of adsorption and desorption, among other parameters
Summary
Over the past two decades, adsorption refrigeration system has gained considerable interest due to its ability to combat ozone depletion problem that was caused by the utilization of CFCs and HCFCs in cooling system [1,2]. The thermo-physical properties of adsorbent/refrigeration pairs as well as the operating conditions have significant effects on the system performance [3,4]. It is a matter of regret that absorption data are unavailable from the manufactures of adsorbents [7,8]. Just the data of surface area and pores volume of the adsorbent are available which are insufficient to design a thermally driven adsorption system [9,10]. The design adsorption based cooling cycle is inevitable to evaluate adsorption isotherms of the assorted adsorbent/adsorbate pairs as well as the isosteric heat of adsorption
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