Share

Effect of advanced surfaces on the ammonia absorption process with NH3/LiNO3 in a tubular bubble absorber.

Author(s) : AMARIS C., BOUROUIS M., VALLÈS M.

Type of article: Article

Summary

An experimental study was conducted to investigate the effect of advanced surfaces on the ammonia absorption process in tubular bubble absorbers using NH3/LiNO3 as a working pair at operating conditions of interest for absorption chillers. The tubular bubble absorber is a vertical double-pipe heat exchanger in which absorption takes place in the inner tube. In order to compare the effect of surface enhancement, a smooth tube and an internally micro-finned tube were tested. The inner tube of the absorber is made of aluminium and has an outer diameter of 8.0 mm and the micro-finned tube has internal helical micro-fins measuring 0.3 mm in length. The effect of tube length on absorption was also studied using two tube lengths (1 and 3 m) and two tube diameters (8 and 9.5 mm). Our results show that the absorption rate achieved with the micro-finned tube is up to 1.7 times higher than with the smooth tube at a solution mass flow rate of 40 kg h-1. We also found that absorption mass flux increases when tube diameter is reduced and decreases when tube length is increased.

Details

  • Original title: Effect of advanced surfaces on the ammonia absorption process with NH3/LiNO3 in a tubular bubble absorber.
  • Record ID : 30010494
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 72
  • Publication date: 2014/05
  • DOI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.01.031

Links


See other articles in this issue (3)
See the source

Indexing