Articles producció científica> Enginyeria Mecànica

Part-load cahracteristics of a new ammonia/lithium nitrate absorption chiller [Caractéristiques à charge partielle d'un nouveau refroidisseur à absorption ammoniac/nitrate de lithium]

  • Identification data

    Identifier: imarina:5130546
    Authors:
    Zamora, MiguelBourouis, MahmoudCoronas, AlbertoValles, Manel
    Abstract:
    A pre-industrial prototype of a new water-cooled ammonia/lithium nitrate absorption chiller was characterised at part-load operation mode. The chiller was built using brazed plate heat exchangers in all its components, including the absorber and the generator. A test campaign was carried out varying the thermal load in the chilled water circuit and keeping the hot and cooling water temperatures constant. Part-load curves of the thermal and electrical coefficients of performance were obtained, plotted and compared with data from the literature on small capacity absorption chillers with conventional working pairs, namely ammonia/water and water/lithium bromide. The experimental results showed that to achieve a higher electrical coefficient of performance at part-load operation, it was much more convenient to use an ON-OFF control than to modify the hot water temperature. Furthermore, using a simple ON-OFF control strategy, the behaviour of the new absorption chiller was more agile and responded more quickly. The part-load curve of the electrical coefficient of performance was obtained by adjusting the experimental data to the shape of the curve proposed in the standard prEN-14825:2011 for air-to-water chillers. The Cc coefficient was 0.7985 matching the value obtained dividing the remaining electrical consumption measured during the OFF half cycles by the total energy consumption generated.
  • Others:

    Author, as appears in the article.: Zamora, Miguel; Bourouis, Mahmoud; Coronas, Alberto; Valles, Manel
    Department: Enginyeria Mecànica
    URV's Author/s: Bourouis Chebata, Mahmoud / Coronas Salcedo, Alberto / Vallès Rasquera, Joan Manel
    Keywords: Part-load operation Lithium nitrate Control Ammonia Absorption chiller
    Abstract: A pre-industrial prototype of a new water-cooled ammonia/lithium nitrate absorption chiller was characterised at part-load operation mode. The chiller was built using brazed plate heat exchangers in all its components, including the absorber and the generator. A test campaign was carried out varying the thermal load in the chilled water circuit and keeping the hot and cooling water temperatures constant. Part-load curves of the thermal and electrical coefficients of performance were obtained, plotted and compared with data from the literature on small capacity absorption chillers with conventional working pairs, namely ammonia/water and water/lithium bromide. The experimental results showed that to achieve a higher electrical coefficient of performance at part-load operation, it was much more convenient to use an ON-OFF control than to modify the hot water temperature. Furthermore, using a simple ON-OFF control strategy, the behaviour of the new absorption chiller was more agile and responded more quickly. The part-load curve of the electrical coefficient of performance was obtained by adjusting the experimental data to the shape of the curve proposed in the standard prEN-14825:2011 for air-to-water chillers. The Cc coefficient was 0.7985 matching the value obtained dividing the remaining electrical consumption measured during the OFF half cycles by the total energy consumption generated.
    Thematic Areas: Thermodynamics Química Mechanical engineering Materiais Interdisciplinar Engineering, mechanical Engenharias iv Engenharias iii Engenharias ii Ciência de alimentos Building and construction Astronomia / física
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: alberto.coronas@urv.cat mahmoud.bourouis@urv.cat manel.valles@urv.cat
    Author identifier: 0000-0002-6109-3680 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/S014070071400303X
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: International Journal Of Refrigeration-Revue Internationale Du Froid. 56 43-51
    APA: Zamora, Miguel; Bourouis, Mahmoud; Coronas, Alberto; Valles, Manel (2015). Part-load cahracteristics of a new ammonia/lithium nitrate absorption chiller [Caractéristiques à charge partielle d'un nouveau refroidisseur à absorption ammoniac/nitrate de lithium]. International Journal Of Refrigeration-Revue Internationale Du Froid, 56(), 43-51. DOI: 10.1016/j.ijrefrig.2014.11.005
    Article's DOI: 10.1016/j.ijrefrig.2014.11.005
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2015
    Publication Type: Journal Publications
  • Keywords:

    Building and Construction,Engineering, Mechanical,Mechanical Engineering,Thermodynamics
    Part-load operation
    Lithium nitrate
    Control
    Ammonia
    Absorption chiller
    Thermodynamics
    Química
    Mechanical engineering
    Materiais
    Interdisciplinar
    Engineering, mechanical
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Ciência de alimentos
    Building and construction
    Astronomia / física
  • Documents:

  • Cerca a google

    Search to google scholar