Evaluation of minimum desorption temperatures of thermal compressors in adsorption refrigeration cycles

The purpose of this paper is to identify the minimum desorption temperatures required to operate thermally driven adsorption beds of a solid sorption refrigeration system. The method is based on the evaluation of uptake efficiency of the adsorption bed and estimating there from conditions under which the compressor ceases to provide any throughput. The difference in the densities of the refrigerant between the inlet and outlet, the adsorption characteristics of the adsorbate-refrigerant pair and the void volume in the thermal compressor are the contributors to the manifestation of the desorption state. Among them, the void volume is a controllable parameter whose role is analogous to the clearance volume in a positive displacement compressor. The methodology has been tested out with three systems, namely, silica gel + water, activated carbon fiber + ethanol and activated carbon + HFC 134a systems. It is shown that waste heat at as low as $60^o C$ can operate these systems which make them good energy conservation devices through recovery of low grade process waste heat.

[1]  Kim Choon Ng,et al.  Experimental investigation of activated carbon fibers/ethanol pairs for adsorption cooling system application , 2006 .

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

[3]  Ruzhu Wang,et al.  Practical experiments on an adsorption air conditioner powered by exhausted heat from a diesel locomotive , 2004 .

[4]  J. J. Guilleminot,et al.  Adsorptive solar powered ice maker: experiments and model , 2000 .

[5]  Manfred J. Horn,et al.  EVALUATION OF A ZEOLITE-WATER SOLAR ADSORPTION REFRIGERATOR , 2003 .

[6]  P. Dutta,et al.  Effect of packing density and adsorption parameters on the throughput of a thermal compressor , 2002 .

[7]  Allan H. Harvey,et al.  Thermodynamic Properties of Water: Tabulation from the IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use | NIST , 1998 .

[8]  Kim Choon Ng.  Recent Developments in Heat-Driven Silica Gel-Water Adsorption Chillers , 2003 .

[9]  R. E. Critoph,et al.  Thermophysical properties of monolithic carbon , 2000 .

[10]  H. Baehr,et al.  An International Standard Formulation for the Thermodynamic Properties of 1,1,1,2‐Tetrafluoroethane (HFC‐134a) for Temperatures from 170 K to 455 K and Pressures up to 70 MPa , 1994 .

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

[12]  T. Fujii.  Theory of Laminar Film Condensation , 1991 .

[13]  F. Meunier,et al.  Solid sorption: An alternative to CFCs , 1993 .

[14]  Kandadai Srinivasan,et al.  Modeling of thermal conductivity of charcoal–nitrogen adsorption beds , 2000 .

[15]  R. E. Critoph.  An ammonia carbon solar refrigerator for vaccine cooling , 1994 .

[16]  Kim Choon Ng,et al.  A study on the kinetics of ethanol-activated carbon fiber: theory and experiments. , 2006 .

[17]  V. Goetz,et al.  An Open Activated Carbon/CO2 Sorption Cooling System , 2001 .

[18]  Kim Choon Ng,et al.  Adsorption Characteristics of Silica Gel + Water Systems , 2002 .

[19]  N. D. Banker,et al.  Performance analysis of activated carbon + HFC-134a adsorption coolers , 2004 .

[20]  Ruzhu Wang,et al.  Study of a novel silica gel-water adsorption chiller. Part I. Design and performance prediction , 2005 .

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

[22]  Takao Kashiwagi,et al.  Modeling the performance of two-bed, sillica gel-water adsorption chillers , 1999 .

[23]  J. J. Guilleminot,et al.  Solar Powered Solid Adsorption Cold Store , 1988 .

[24]  Ph. Grenier,et al.  Experimental Data on a Solar-Powered Ice Maker Using Activated Carbon and Methanol Adsorption Pair , 1987 .

[25]  Takao Kashiwagi,et al.  Multi-bed regenerative adsorption chiller - improving the utilization of waste heat and reducing the chilled water outlet temperature fluctuation , 2001 .

[26]  K. Srinivasan,et al.  Adsorption of 1,1,1,2-Tetrafluoroethane on Activated Charcoal , 2001 .

[27]  Takao Kashiwagi,et al.  Experimental investigation of a silica gel-water adsorption refrigeration cycle -- The influence of operating conditions on cooling output and COP , 1995 .