ahmed_askalany

Dr. ahmed askalany

Lecturer -

Faculty of industrial education

Address: برج الحمد - دماريس - المنيا

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2016 | Keywords Cooling,
Adsorption isotherms and kinetics of activated carbon/Difluoroethane adsorption pair: Theory and experiments
This study introduces a new adsorbent/refrigerant pair to be used in adsorption cooling applications. Adsorption isotherms and kinetics of Difluoroethane (HFC-152a) onto highly porous activated carbon Maxsorb III at temperatures ranging from 25 to 75°C have been investigated. Experimental data of adsorption uptake have been fitted with Dubinin–Astakhov (D– A) and Tóth equations. D–A equation is found to be more ... Read more

2016 | Keywords Adsorption isotherms,
Adsorption isotherms and kinetics of a mixture of Pentafluoroethane, 1,1,1,2-Tetrafluoroethane and Difluoromethane (HFC-407C) onto granular activated carbon
In this study, experimental and theoretical adsorption isotherms and kinetics of HFC-407C onto activated carbon have been investigated. AquaSorb 2000 granular activated carbon has been used as adsorbent. An experimental apparatus has been designed and built and experimental investigations have been carried out across assorted adsorption temperatures that are useful to the operation of adsorption chillers. Experimental data of the ... Read more

2016 | Keywords desalination,
Innovative mechanical vapor compression adsorption desalination (MVC-AD) system
An innovative combination between mechanical vapor compression and adsorption techniques has been studied as a hybrid desalination system. A semi continues adsorption desalination-cooling system employing silica gel with two adsorption beds has been proposed. The proposed system has been investigated theoretically to work under different operating conditions using a proposed simulation FORTRAN code. The results have been compared with an ... Read more

2016 | Keywords Cooling,
Study of a silica gel-water based dual mode adsorption chiller
This article presents analytical investigation results on the performance of dual-mode multi-bed adsorption cooling systems using silica gel-water pair. This novel adsorption chiller utilizes effectively low-temperature solar or waste heat sources of temperature between 40 and 85°C. Two operation modes are possible for the advanced chiller. The first operation mode will be to work as a highly efficient conventional chiller ... Read more

Highly porous activated carbon based adsorption cooling system employing difluoromethane and a mixture of pentafluoroethane and difluoromethane
This paper presents a simulation for a lowgrade thermally powered two-beds adsorption cooling system employing HFC-32 and a mixture of HFC-32 and HFC-125 (HFC-410a) with activated carbon of type Maxsorb III. The present simulation model adopts experimentally measured adsorption isotherms, adsorption kinetics and isosteric heat of adsorption data. Effect of operating conditions (mass flow rate of hot water, driving heat ... Read more

2016 | Keywords desalination,
A state of the art of hybrid adsorption desalination–cooling systems
Adsorption-baseddesalinationattractedincreasinglyattentionduetoitsabilitytoco-generatedouble distilled freshwaterandcoolingeffectusingonlyoneheatinput.Thesystememploysacombinationof flash evaporationandthermalcompression.Thispaperpresentsthecurrentliteraturereviewonthedual effect (coolinganddesalination)adsorptiondesalinationsystem(ADS),whichisanemergingprocessof thermal desalinationwithcoolingutilizinglow-gradeheatsource.Thepaperalsopresentstheadsor- bents suitableforadsorption–desalination systems,performanceofADS,andthethermodynamicana- lysisoftheadsorptiondesalinationcycle.AcomparisonbetweenthestatedADShasbeenalsopresented in thisstudy. Read more

2015 | Keywords Renewable Energy,
An overview on adsorption cooling systems powered by waste heat from internal combustion engine
Chlorofluorocarbon andhydrochlorofluorocarbon refrigerantshavebeenwidelyusedintraditional cooling systems.TheserefrigerantsacceleratethedepletionoftheEarth’s ozonelayer.Therefore, adsorption air-conditioningtechnologyattractedmuchattentionrecentlyasanalternativesolutiondue to itsadvantageofenvironmentalfriendliness.Thissystemasitpoweredbywasteand/orsolarheatcan help toreducerequiredenergyandthermalpollution.Thispaperpresentsanoverviewofresearch which havebeencarriedoutonadsorptioncoolingsystemspoweredbywasteheatfromautomobiles. Manyadsorptionpairshavebeenstudied.Zeolite–waterasaworkingadsorptionpairhasbeenwidely used inautomobileadsorptioncoolingsystems.Thispairhasbeenpoweredbyexhaustgasesfromthe engine duetoitsrelativelyhighworkingtemperature.Silicagel–waterpairhasbeenalsowidelyusedin automobile adsorptioncoolingsystems.Ithasbeenpoweredbywasteheatfromwatercoolantinthe engine duetoitsrelativelylowworkingtemperature.Resultsshowthatthistechnologycanhelpin increasing overallengineefficiency andreducethermalpollutionfromengines.Variousmodifications in adsorption coolingsystemsarestillrequired.Oneofthebottleneckswhichpreventstheimprovementof adsorption coolingtechnologyisitsrelativelylowperformancecomparedtoconventionalvapor mechanical compressiontechnologies. Read more

2015 | Keywords heat transfer,
Derivation of isosteric heat of adsorption for non-ideal gases
This paper presented a theoretical framework for precise determination of the isosteric heat of adsorption for non-ideal gases. The derived equation had been applied for various adsorbent–refrigerant pairs. Highly porous activated carbon powder, namely Maxsorb III and activated carbon fiber of type (A-20) were used as adsorbents with HFC-134a and HFC-410a as refrigerants. The isosteric heat of adsorption data showed ... Read more

2015 | Keywords Cooling,
Experimental and theoretical study of adsorption kinetics of Difluoromethane onto activated carbons
This paper presents theoretical and experimental adsorption kinetics of Difluoromethane (HFC-32) onto activated carbon powder of type Maxsorb III and activated carbon fiber of type A-20. The experimental runs have been conducted on an apparatus that has been designed and built specially for this purpose. The adsorption kinetics have been determined at different adsorption temperatures ranging from 25 C to ... Read more

2014 | Keywords Cooling,
Adsorption isotherms and kinetics of HFC410A onto activated carbons
Experimental and theoretical adsorption isotherms and kinetics data of HFC410A onto activated carbons are reported. Activated carbon powder of type Maxsorb III and activated carbon fiber of type A-20 have been used as adsorbents. An experimental apparatus has been designed and built and experimental investigation has been carried out at five adsorption temperatures in the range of 10e50 C. Experimental ... Read more