Thermodynamic Analysis of Activated Carbon- CO2 based Adsorption Cooling Cycles

Authors: Skander Jribi, Anutosh Chakraborty, Ibrahim I. El-Sharkawy, Bidyut Baran Saha, Shigeru Koyama

Abstract:

Heat powered solid sorption is a feasible alternative to electrical vapor compression refrigeration systems. In this paper, activated carbon (powder type Maxsorb and fiber type ACF-A10)- CO2 based adsorption cooling cycles are studied using the pressuretemperature- concentration (P-T-W) diagram. The specific cooling effect (SCE) and the coefficient of performance (COP) of these two cooling systems are simulated for the driving heat source temperatures ranging from 30 ºC to 90 ºC in terms of different cooling load temperatures with a cooling source temperature of 25 ºC. It is found from the present analysis that Maxsorb-CO2 couple shows higher cooling capacity and COP. The maximum COPs of Maxsorb-CO2 and ACF(A10)-CO2 based cooling systems are found to be 0.15 and 0.083, respectively. The main innovative feature of this cooling cycle is the ability to utilize low temperature waste heat or solar energy using CO2 as the refrigerant, which is one of the best alternative for applications where flammability and toxicity are not allowed.

Keywords: Activated carbon, Adsorption cooling system, Carbon dioxide, Performance evaluation.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1328392

References:

[1] E. Boelman, B.B. Saha and T. Kashiwagi, "Experimental investigation of a silica gel-water adsorption refrigeration cycleÔÇöthe influence of operating conditions on cooling output and COP", ASHRAE Trans., vol. 101, pp. 358-366, 1995.
[2] B.B. Saha, E. Boelman and T. Kashiwagi, "Computer simulation of a silica gel-water adsorption refrigeration cycleÔÇöthe influence of operating conditions on cooling output and COP", ASHRAE Trans., vol. 101, pp. 348-357, 1995.
[3] M. Tatlier and A. Erdem-Senatalar, "Effects of thermal gradients in a solar adsorption heat pump utilizing the zeolite-water pair", Appl. Therm. Eng., vol. 19, pp. 1157-1172, 1999.
[4] D.C. Wang, Z.Z. Xia, and J.Y. Wu, "Design and performance prediction of a novel zeolite-water adsorption air conditioner", Energy Conv. Mang., vol. 47, pp. 590-610, 2006.
[5] R.E. Critoph, "Forced convection enhancement of adsorption cycles", Heat Recovery Syst. CHP, vol. 14, pp. 343-350, 1994.
[6] R.E. Critoph, "Forced convection adsorption cycles", Appl. Therm. Eng., vol. 18, pp. 799-807, 1998.
[7] D.J. Miles and S.V. Shelton, "Design and testing of a solid-sorption heat-pump system", Appl. Therm. Eng., vol. 16, pp. 389-394, 1996.
[8] M. Pons and J.J. Guilleminot, "Design of an experimental solar powered, solid adsorption ice maker", J. Solar Energy Eng., Trans. ASME, vol. 103, pp. 332-337, 1986.
[9] F. Meunier, "Solid sorption heat powered cycles for cooling and heat pumping applications", Appl. Therm. Eng., vol. 18, pp. 715-729, 1989.
[10] B.B. Saha, A. Akisawa and T. Kashiwagi, "Silica gel water advanced adsorption refrigeration cycle", Energy, vol. 22, pp. 437-447, 1997.
[11] B.B. Saha, S. Koyama, J.B. Lee, K. Kuwahara, K.C.A. Alam, Y. Hamamoto, A. Akisawa and T. Kashiwagi, "Performance evaluation of a low temperature waste heat driven multi-bed adsorption chiller", Int. J. Multiph. Flow, vol.29, pp. 1249-1263, 2003.
[12] R.Z. Wang, R.G. Oliveira, "Adsorption refrigeration-An efficient way to make good use of waste heat and solar energy". Prog. Energy Comb. Sci., vol. 32, pp. 424-458, 2006..
[13] S. Himeno, T. Komatsu, and S. Fujita, "High-pressure adsorption equilibria of methane and carbon dioxide on several activated carbons", J. Chem. and Eng. Data, vol. 50 (2), pp. 369-376, 2005.
[14] Biloe, S., Goetz, V., Mauran, S., Dynamic discharge and performance of a new adsorbent for natural gas storage, AIChE J. 47 (12), pp. 2819- 2830, 2001.
[15] K. J. Chang and O. Talu, "Behavior and performance of adsorptive natural gas storage cylinders during discharge", App. Therm. Eng., vol. 16 (5 SPEC. ISS.), pp. 359-374, 1996.