Adsorption properties of a natural zeolite-water pair for use in adsorption cooling cycles


Solmus I., Yamali C., KAFTANOĞLU B., Baker D. , Caglar A.

APPLIED ENERGY, vol.87, no.6, pp.2062-2067, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 87 Issue: 6
  • Publication Date: 2010
  • Doi Number: 10.1016/j.apenergy.2009.11.027
  • Title of Journal : APPLIED ENERGY
  • Page Numbers: pp.2062-2067
  • Keywords: Adsorption, Cooling, Natural zeolite-water, Isosteric heat of adsorption, ACTIVATED CARBON, WORKING PAIRS, REFRIGERATION, PERFORMANCE, SYSTEM

Abstract

The equilibrium adsorption capacity of water on a natural zeolite has been experimentally determined at different zeolite temperatures and water vapor pressures for use in an adsorption cooling system. The Dubinin-Astakhov adsorption equilibrium model is fitted to experimental data with an acceptable error limit. Separate correlations are obtained for adsorption and desorption processes as well as a single correlation to model both processes. The isosteric heat of adsorption of water on zeolite has been calculated using the Clausius-Clapeyron equation as a function of adsorption capacity. The cyclic adsorption capacity swing for different condenser, evaporator and adsorbent temperatures is compared with that for the following adsorbent-refrigerant pairs: activated carbon-methanol; silica gel-water; and, zeolite 13X-water. Experimental results show that the maximum adsorption capacity of natural zeolite is nearly 0.12 kg(w)/kg(ad) for zeolite temperatures and water vapor pressures in the range 40-150 degrees C and 0.87-738 kPa. (C) 2009 Elsevier Ltd. All rights reserved.