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Heat and Mass Transfer

, Volume 53, Issue 1, pp 107–114 | Cite as

Highly porous activated carbon based adsorption cooling system employing difluoromethane and a mixture of pentafluoroethane and difluoromethane

  • Ahmed A. AskalanyEmail author
  • Bidyut B. Saha
Original
  • 226 Downloads

Abstract

This paper presents a simulation for a low-grade 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 source temperature and evaporator temperature) on the system performance has been studied in detail. The simulation results showed that the system could be powered by low-grade heat source temperature (below 85 °C). AC/HFC-32 and AC/HFC-410a adsorption cooling cycles achieved close specific cooling power and coefficient of performance values of 0.15 kW/kg and 0.3, respectively at a regeneration temperature of 90 °C along with evaporator temperature of 10 °C. The investigated semi continuous adsorption cooling system could produce a cooling power of 9 kW.

Keywords

Isosteric Heat Evaporator Temperature Heat Source Temperature Linear Driving Force Difluoromethane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

A

Area (m2)

C

Adsorption capacity on mass basis (cm3/kg)

Co

Maximum adsorption capacity on mass basis (cm3/kg)

cp

Specific heat (kJ/kg K)

Ds

Surface diffusion coefficient (m2/s)

Ds0

Pre-exponential coefficient (m2/s)

E

Characteristic energy (kJ/kg)

Ea

Activation energy (kJ/kg)

F

Constant

hfg

Latent heat (kJ/kg)

Hst

Isosteric heat of adsorption (kJ/kg)

K

Thermal conductivity (W/m K)

m

Mass (kg)

Mass flow rate (kg/s)

n

Exponential fitting parameter

P

Pressure (kPa)

Ps

Saturation pressure (kPa)

R

Universal gas constant (kJ/kg K)

Rp

Maximum radius of the particle (m)

T

Temperature (K)

t

Time (s)

U

Overall heat transfer coefficient (W/m2 K)

α

Thermal expansion (1/K)

Subscript

ac

Activated carbon

ads

Adsorption

b

Bed

bed

Adsorption bed

c

Condenser

chill

Chilled water

des

Desorption

ev

Evaporator

g

Gas

h

Heating water

hex

Heat exchanger

in

Inlet

out

Outlet

ref

Refrigerant

reg

Regeneration

s

Saturation

sol

Solid

sur

Surrounding

w

Water

References

  1. 1.
    Wongsuwan W, Kumar S, Neveu P, Meunier F (2001) A review of chemical heat pump technology and applications. Appl Therm Eng 2:1489–1519CrossRefGoogle Scholar
  2. 2.
    Demir H, Mobedi M, Ülkü S (2008) A review on adsorption heat pump: problems and solutions. Renew Sust Energy Rev 12:2381–2403CrossRefGoogle Scholar
  3. 3.
    Alghoul MA, Sulaiman MY, Azmi BZ, Wahab MA (2007) Advances on multi-purpose solar adsorption systems for domestic refrigeration and water heating. Appl Therm Eng 27:813–822CrossRefGoogle Scholar
  4. 4.
    Li XH, Hou XH, Zhang X, Yuan XZ (2015) A review on development of adsorption cooling—novel beds and advanced cycles. Energy Convers Manage 94:221–232CrossRefGoogle Scholar
  5. 5.
    Jribi S, Saha BB, Koyama S, Bentaher H (2014) Modeling and simulation of an activated carbon–CO2 four bed based adsorption cooling system. Energy Convers Manage 78:985–991CrossRefGoogle Scholar
  6. 6.
    Askalany AA, Saha BB, Ahmed MS, Ismail IM (2013) Adsorption cooling system employing granular activated carbon-R134a pair for renewable energy applications. Int J Refrig 36:1037–1044CrossRefGoogle Scholar
  7. 7.
    Askalany AA, Salem M, Ismael IM, Ali AHH, Morsy MG (2012) A review on adsorption cooling systems with adsorbent carbon. Renew Sust Energy Rev 16:493–500CrossRefGoogle Scholar
  8. 8.
    Li TX, Wang RZ, Li H (2014) Progress in the development of solid-gas sorption refrigeration thermodynamic cycle driven by low-grade thermal energy. Prog Energy Combust Sci 40:1–58CrossRefGoogle Scholar
  9. 9.
    Cho K, Ziegler F, Auracher H (2009) Progress in sorptive cooling systems. Int J Refrig 32:563–565CrossRefGoogle Scholar
  10. 10.
    Critoph RE, Zhong Y (2005) Review of trends in solid sorption refrigeration and heat pumping technology. Proc Inst Mech Eng E J 219:285–300CrossRefGoogle Scholar
  11. 11.
    Ziegler F, Satzger P (2005) Increase of the efficiency of the heat transfer phase in solid sorption or reaction systems. Int J Therm Sci 44:1115–1122CrossRefGoogle Scholar
  12. 12.
    Askalany AA, Salem M, Ismael IM, Ali AHH, Morsy MG (2012) Experimental study on adsorption-desorption characteristics of granular activated carbon/R134a pair. Int J Refrig 35(3):494–498CrossRefGoogle Scholar
  13. 13.
    Tokarev MM, Veselovskaya JV, Yanagi H, Aristov YuI (2010) Novel ammonia sorbents “porous matrix modified by active salt” for adsorptive heat transformation: 2. Calcium chloride in ACF felt. Appl Therm Eng 30:845–849CrossRefGoogle Scholar
  14. 14.
    Oliveira RG, Wang RZ, Li TX (2010) Adsorption characteristic of methanol in activated carbon impregnated with lithium chloride. Chem Eng Technol 33:1679–1686CrossRefGoogle Scholar
  15. 15.
    Saha BB, Chakraborty A, Koyama S, Aristov YuI (2009) A new generation cooling device employing CaCl2-in-silica gel-water system. Int J Heat Mass Transf 52:516–524CrossRefzbMATHGoogle Scholar
  16. 16.
    Aristov YuI, Chalaev DM, Dawoud B, Heifets LI, Popel OS, Restuccia G (2007) Simulation and design of a solar driven thermochemical refrigerator using new chemisorbents. Chem Eng J 134:58–65CrossRefGoogle Scholar
  17. 17.
    Saha BB, El-Sharkawy II, Koyama S, Lee JB, Kuwahara K (2006) Waste heat driven multi-bed adsorption chiller: heat exchangers overall thermal conductance on chiller performance. Heat Transf Eng 27:80–87CrossRefGoogle Scholar
  18. 18.
    Anyanwu EE (2003) Review of solid adsorption solar refrigerator I: an overview of the refrigeration cycle. Energy Convers Manage 44:301–312CrossRefGoogle Scholar
  19. 19.
    Attan D, Alghoul MA, Saha BB, Assadeq J, Sopian K (2011) The role of activated carbon fiber in adsorption cooling cycles. Renew Sust Energy Rev 15:1708–1721CrossRefGoogle Scholar
  20. 20.
    Li TX, Wang RZ, Kiplagat JK, Chen H, Wang LW (2011) A new target-oriented methodology of decreasing the regeneration temperature of solid-gas thermochemical sorption refrigeration system driven by low-grade thermal energy. Int J Heat Mass Transf 54:4719–4729CrossRefGoogle Scholar
  21. 21.
    Sah RP, Choudhury B, Das RK (2015) A review on adsorption cooling systems with silica gel and carbon as adsorbents. Renew Sust Energy Rev 45:123–134CrossRefGoogle Scholar
  22. 22.
    Askalany AA, Saha BB, Uddin K, Miyzaki T, Koyama S, Srinivasan K, Ismail IM (2013) Adsorption isotherms and heat of adsorption of difluoromethane on activated carbons. J Chem Eng Data 58(10):2828–2834CrossRefGoogle Scholar
  23. 23.
    Askalany AA, Saha BB (2015) Experimental and theoretical study of adsorption kinetics of Difluoromethane onto activated carbons. Int J Refrig 49:160–168CrossRefGoogle Scholar
  24. 24.
    Askalany AA, Salem M, Ismael IM (2014) Adsorption isotherms and kinetics of HFC410A onto activated carbons. Appl Therm Eng 72:237–243CrossRefGoogle Scholar
  25. 25.
    Habib K, Saha BB, Chakraborty A, Koyama S, Srinivasan K (2011) Performance evaluation of combined adsorption refrigeration cycles. Int J Refrig 34:129–137CrossRefGoogle Scholar
  26. 26.
    Turner L (1972) Improvement of activated charcoal-ammonia adsorption heat pumping/refrigeration cycles. Investigation of porosity and heat/mass transfer characteristics. Ph.D. thesis, University of WarwickGoogle Scholar
  27. 27.
    Critoph RE, Turner L (1995) Heat transfer in granular activated carbon beds in the presence of adsorbable gases. J Hear Mass Transf 38(9):1577–1585CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Mechanical Engineering Department, Faculty of Industrial EducationSohag UniversitySohagEgypt
  2. 2.Interdisciplinary Graduate School of Engineering SciencesKyushu UniversityFukuokaJapan
  3. 3.International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu UniversityFukuokaJapan

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