Comparison of the adsorption performance of compound adsorbent in a refrigeration cycle with and without mass recovery

Abstract Adsorption and desorption were performed on a compound adsorbent composed of CaCl 2 and activated carbon in cycles both with and without mass recovery and the performances obtained were compared with those of equilibrium adsorption. Experimental results of the cycles without mass recovery carried out on an adsorption refrigeration unit yielded performances that were slightly less than those of equilibrium adsorption. The adsorption performances of the cycle with mass recovery were measured to be much better than those of the cycle without mass recovery. At - 15 ∘ C of evaporating temperature, the cycle adsorption capacity was as high as 0.78 kg/kg for the cycle with mass recovery while it was only 0.55 kg/kg for the cycle without mass recovery. The average adsorption/desorption rate of the cycle with mass recovery, which was 0.031 (kg/kg)/min, has been improved by 47.6% compared with that of the cycle without mass recovery. Research on the cycle adsorption capacity at different evaporating temperatures showed that the improvement of cycle adsorption capacity, with mass recovery, was higher under the condition of lower evaporating temperature. At - 35 ∘ C evaporating temperature, the mass recovery operation had improved the adsorption capacity by 78% compared with the cycle without mass recovery. In addition, refrigeration performances for the cycles with and without mass recovery at an evaporating temperature of - 25 ∘ C were studied. Compared with the results of the cycle without mass recovery, SCP (specific cooling power) and COP (coefficient of refrigeration performance) have been improved by 48.6% and 54.5%, respectively, when mass recovery is performed.

[1]  Young Seok Kim,et al.  Characteristics of non-uniform reaction blocks for chemical heat pump , 2005 .

[2]  R. E. Critoph.  Rapid cycling solar/biomass powered adsorption refrigeration system , 1999 .

[3]  S. Mauran,et al.  Heat and mass transfer in consolidated reacting beds for thermochemical systems , 1993 .

[4]  Zine Aidoun,et al.  Analysis of chemical heat pumps (CHPs): Basic concepts and numerical model description , 1998 .

[5]  Bernard Spinner,et al.  Thermodynamic techniques for the conceptual design of thermochemical refrigerators using two salt materials , 2002 .

[6]  Takao Kashiwagi,et al.  Performance evaluation of a low-temperature waste heat driven multi-bed adsorption chiller , 2003 .

[7]  Yu. I. Aristov,et al.  New composite sorbent CaCl2 in mesopores for sorption cooling/heating , 2002 .

[8]  S. O. Enibe,et al.  Heat and mass transfer in porous spherical pellets of CaCl2 for solar refrigeration , 2000 .

[9]  Ruzhu Wang,et al.  Performance improvement of adsorption cooling by heat and mass recovery operation , 2001 .

[10]  Yong Tae Kang,et al.  Review of advanced absorption cycles: performance improvement and temperature lift enhancement , 2000 .

[11]  Ling Jin,et al.  Efficiency of sediment transport by flood and its control in the Lower Yellow River , 2004 .

[12]  R. E. Critoph,et al.  A prototype of a fast cycle adsorption refrigerator utilizing a novel carbon—aluminium laminate , 2000 .

[13]  Ruzhu Wang,et al.  Compound adsorbent for adsorption ice maker on fishing boats , 2004 .

[14]  M. Pons,et al.  Adsorptive machines with advanced cycles for heat pumping or cooling applications , 1999 .

[15]  S. O. Enibe,et al.  Computer simulation of a CaCl2 solid-adsorption solar refrigerator , 1995 .

[16]  Zacharie Tamainot-Telto,et al.  Adsorption refrigerator using monolithic carbon-ammonia pair , 1997 .

[17]  K. Ng,et al.  Waste heat driven dual-mode, multi-stage, multi-bed regenerative adsorption system , 2003 .

[18]  W. Liwei,et al.  Adsorption performances and refrigeration application of adsorption working pair of CaCl2−NH3 , 2004 .

[19]  Vincent Goetz,et al.  Rotary system for the continuous production of cold by solid–gas sorption: modeling and analysis of energy performance , 2000 .