Kinetics of water adsorption on loose grains of SWS-1L under isobaric stages of adsorption heat pumps: The effect of residual air

✍ Scribed by I.S. Glaznev; Yu.I. Aristov

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 290 KB
• Volume: 51
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/j.ijheatmasstransfer.2008.04.061

✦ Synopsis

In this paper we studied the effect of a non-adsorbable gas (air) on kinetics of water adsorption on loose grains of the composite adsorbent SWS-1L (silica modified by calcium chloride) (grain size 0.8-0.9 and 1.4-1.6 mm). The adsorbent grains were placed on the surface of isothermal metal plate at T = 60 °C and equilibrated with the mixture of water vapor at P H 2 O = 10.3 mbar and air at a certain partial pressure P A . After that the metal plate was subjected to a temperature drop down to 35 °C at almost constant pressure over the grains. Reduction of the adsorption rate was revealed even at the partial pressure of residual air P A as low as 0.06 mbar. At P A > 0.4 mbar the kinetic curves were near-exponential and the characteristic adsorption time s did not depend on the grain size and increased as s = s 0 + AP A , where A = 700 ± 50 s/mbar. Desorption stage was less affected by the residual air. The specific cooling power generated during the isobaric adsorption stage was estimated as a function of the residual air pressure.