Towards an optimal performance of adsorption chillers: Reallocation of adsorption/desorption cycle times

El-Sharkawy, Ibrahim I.; AbdelMeguid, Hossam; Saha, Bidyut Baran

doi:10.1016/j.ijheatmasstransfer.2013.03.076

Cited by 75 publications

(27 citation statements)

References 25 publications

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“…Thermally powered adsorption cooling systems seems to be a promising alternative of conventional vapor compression cycles. The main advantages of these systems are; (i) they can be driven using low temperature heat source, (ii) they use natural refrigerants such as water, ethanol and methanol, and (iii) almost no electricity usage [1]. However, the main drawback of these systems is their low performance in terms of COP and cooling capacity.…”

Section: Introductionmentioning

confidence: 99%

“…However, the main drawback of these systems is their low performance in terms of COP and cooling capacity. Intensive research efforts have been devoted to improve the system performance, for instance, using promising adsorbent/refrigerant pairs [2][3][4][5][6][7][8][9][10][11][12] and optimizing the operation strategy of adsorption cycles [1,13,14]. Heat transfer intensification through the adsorbent bed is also one of the most effective methods for developing high performance cooling systems due to the poor heat transfer between adsorbent particles.…”

Section: Introductionmentioning

confidence: 99%

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A study on consolidated composite adsorbents for cooling application

El-Sharkawy

Pal

Miyazaki

et al. 2016

Applied Thermal Engineering

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In this study, consolidated composite adsorbents which are combinations of a highly porous activated carbon powder (Maxsorb III), expanded graphite (EG) and binder have been developed and characterized. Porous properties of the developed composite adsorbents have been investigated experimentally using Nitrogen adsorption.Adsorption equilibrium uptakes of ethanol onto composite adsorbents have been measured and correlated using suitable adsorption isotherm models. Thermal

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study on consolidated composite adsorbents for cooling application

El-Sharkawy

Pal

Miyazaki

et al. 2016

Applied Thermal Engineering

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“…Simulation results showed that the new cycle time was effective for both working pairs, and the cooling capacity was increased as much as by 6%. El-Sharkawy et al [8] presented a theoretical investigation of the effect of adsorption/desorption time allocation on the performance of adsorption chillers. Theoretical results showed that for a half cycle time of 350 s, switching time of 35 s. Optimum adsorption/desorption time minimizes fluctuations in chilled water outlet temperature.…”

Section: /15mentioning

confidence: 99%

Parametric Study of an Adsorption Refrigeration System Using Different Working Pairs

Gado

Elgendy

Elsayed

et al. 2017

Eng. Sci. and Milit. Techno.

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Adsorption refrigeration system (ARS) is regarded as one of promising clean technologies since it uses a low-grade thermal energy (solar energy, waste heat, etc.). The present paper provides a dynamic modeling of two-bed ARS with RD silica gel/water and SWS-1L/water as working pairs based on MATLAB program. The refrigeration capacity and coefficient of performance are calculated in terms of cycle time, hot water inlet temperature, cooling water inlet temperature, and chilled water inlet temperature. Simulation results indicated that the coefficient of performance increases linearly with adsorption/desorption time. Refrigeration capacity increases gradually until reaches an optimal adsorption/desorption time and then reduces. RD silica gel/water and SWS-1L/water pairs provides a refrigeration capacity of 11.7 kW and 4 kW, respectively at evaporator temperature of 10. Both working pairs are limited by the hot water inlet temperature of 95. The half cycle times are fixed to 350 and 280 s for RD silica gel/water and SWS-1L/water, respectively which selected based on optimum time which gives maximum cooling capacity, whereas the switching time for pre-cooling and pre-heating processes is set to 30 s for both working pairs.

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“…(t des /t ads ) concept to find the desorption time [27]. If t des /t ads ratio is arbitrarily changed, the advantages of configuration-2 may be unable to achieve, which will decrease the overall performance of the system.…”

Section: Advanced Cooling and Desalination Systemmentioning

confidence: 99%