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International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

STUDY ON ACF/ETHANOL BASED TWO STAGE ADSORPTION COOLING CYCLE

page 10
DOI: 10.1615/IHTC13.p12.470
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ABSTRACT

With the increasing utility cost, awareness of global warming and ozone depletion, low-temperature waste heat energy sources to powered adsorption cooling and heat pump systems have received growing attention. In this paper, a numerical investigation on the performance of a thermally driven two-stage adsorption chiller where low-grade waste heat sources between 50°C and 70°C are employed in combination with a heat sink (cooling water) of 30°C for air-conditioning applications, is presented. Activated carbon fiber (ACF) of type (A-20)/ethanol pair has been examined as an adsorbent/refrigerant pair. A cycle simulation program is developed to analyze the influence of operating conditions (hot and cooling water temperatures and adsorption/desorption cycle times) on the cycle performance in terms of cooling capacity and COP. The main advantage of this two-stage chiller is that it can be operational with smaller regenerating temperature lifts (≥Tregeneration = heat source-heat sink inlet temperatures) than other heat-driven single-stage chillers. Being a compressible material, the effect of packing density of ACF in the adsorbent beds is also considered in the present model. Simulation results shows that the two-stage chiller can be operated effectively with heat sources of 50°C and 70°C in combination with a coolant at 30°C.

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