Author(s): , , ,

Keywords: , , , , ,

Abstract: The potential for the use of multi-walled carbon nanotubes (MWCNTs) for the adsorption of ammonia in solid-gas adsorption refrigeration applications has been investigated by experimental determination of ammonia adsorption properties, as well as the thermal conductivity of a composite adsorption material. In addition to this, two models for estimating the adsorption of ammonia on MWCNTs were evaluated. It was determined that the adsorption amount of ammonia on MWCNTs at equilibrium increased with an increase in pressure, and that it also increased with a decrease in the temperature of the adsorbent. The thermal conductivity of the MWCNT/calcium chloride composite adsorbent was found to be lower than that of pure MWCNTs, but 8 times higher than that of CaCl2. The ammonia adsorption capacity of MWCNTs was much lower than that of the traditional material used in solid-gas adsorption refrigeration, and so it was concluded that MWCNTs are not suitable for this application. However, since the thermal conductivity of the composite material was higher than that of CaCl2, MWCNTs could potentially be used as an additive to this chemical adsorbent.

Reference: Applied Thermal Engineering, 77 (2015) 20-29

DOI: 10.1016/j.applthermaleng.2014.12.001