Articles producció científica> Enginyeria Mecànica

Effect of advanced surfaces on the ammonia absorption process with NH 3/LiNO3 in a tubular bubble absorber

  • Identification data

    Identifier: imarina:5127739
    Authors:
    Amaris, CarlosBourouis, MahmoudVallès, Manel
    Abstract:
    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.
  • Others:

    Author, as appears in the article.: Amaris, Carlos; Bourouis, Mahmoud; Vallès, Manel
    Department: Enginyeria Mecànica
    URV's Author/s: Bourouis Chebata, Mahmoud / Vallès Rasquera, Joan Manel
    Keywords: Tubular heat exchanger Lithium nitrate Bubble absorber Ammonia Advanced surfaces
    Abstract: 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.
    Thematic Areas: Thermodynamics Mechanics Mechanical engineering Materiais Matemática / probabilidade e estatística Interdisciplinar Geociências Fluid flow and transfer processes Engineering, mechanical Engenharias iv Engenharias iii Engenharias ii Engenharias i Condensed matter physics Ciências biológicas i Ciências ambientais Ciências agrárias i Ciência de alimentos Biotecnología Astronomia / física
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: mahmoud.bourouis@urv.cat manel.valles@urv.cat
    Author identifier: 0000-0003-2476-5967 0000-0002-0748-1287
    Record's date: 2024-09-07
    Papper version: info:eu-repo/semantics/acceptedVersion
    Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S0017931014000593
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: International Journal Of Heat And Mass Transfer. 72 544-552
    APA: Amaris, Carlos; Bourouis, Mahmoud; Vallès, Manel (2014). Effect of advanced surfaces on the ammonia absorption process with NH 3/LiNO3 in a tubular bubble absorber. International Journal Of Heat And Mass Transfer, 72(), 544-552. DOI: 10.1016/j.ijheatmasstransfer.2014.01.031
    Article's DOI: 10.1016/j.ijheatmasstransfer.2014.01.031
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2014
    Publication Type: Journal Publications
  • Keywords:

    Condensed Matter Physics,Engineering, Mechanical,Fluid Flow and Transfer Processes,Mechanical Engineering,Mechanics,Thermodynamics
    Tubular heat exchanger
    Lithium nitrate
    Bubble absorber
    Ammonia
    Advanced surfaces
    Thermodynamics
    Mechanics
    Mechanical engineering
    Materiais
    Matemática / probabilidade e estatística
    Interdisciplinar
    Geociências
    Fluid flow and transfer processes
    Engineering, mechanical
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Engenharias i
    Condensed matter physics
    Ciências biológicas i
    Ciências ambientais
    Ciências agrárias i
    Ciência de alimentos
    Biotecnología
    Astronomia / física
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