Author, as appears in the article.: Cerezo, Jesus; Bourouis, Mahmoud; Valles, Manel; Coronas, Alberto; Best, Roberto
Department: Enginyeria Mecànica
URV's Author/s: Bourouis Chebata, Mahmoud / CEREZO ROMÁN, JESÚS / Coronas Salcedo, Alberto / Vallès Rasquera, Joan Manel
Keywords: Plate heat exchanger Bubble absorber Bubble Ammonia-water Ammonia Absorption refrigeration Absorption cycle Absorption Absorber
Abstract: The development of absorption chillers activated by renewable heat sources has increased due mainly to the increase in primary energy consumption that causes problems such as greenhouse gases and air pollution among others. These machines, which could be a good substitute for compression systems, could be used in the residential and food sectors which require a great variety of refrigeration conditions. Nevertheless, the low efficiency of these machines makes it necessary to enhance heat and mass transfer processes in the critical components, mainly the absorber, in order to reduce their large size. This study used ammonia-water as the working fluid to look at how absorption takes place in a plate heat exchanger operating under typical conditions of absorption chillers, driven by low temperature heat sources. Experiments were carried out using a corrugated plate heat exchanger model NB51, with three channels, where ammonia vapor was injected in bubble mode into the solution in the central channel. The results achieved for the absorption flux were in the range of 0.0025-0.0063 kg m-2 s-1, the solution heat transfer coefficient varied between 2.7 and 5.4 kW m-2 K-1, the absorber thermal load from 0.5 to 1.3 kW. In addition, the effect of the absorber operating conditions on the most significant efficiency parameters was analyzed. The increase in pressure, solution and cooling flow rates positively affect the absorber performance, on the other hand an increase in the concentration, cooling, and solution temperature negatively affects the absorber performance. © 2008 Elsevier Ltd. All rights reserved.
Thematic Areas: Thermodynamics Química Medicina iii Mechanics Mechanical engineering Materiais Matemática / probabilidade e estatística Interdisciplinar Industrial and manufacturing engineering Fluid flow and transfer processes Engineering, mechanical Engenharias iv Engenharias iii Engenharias ii Engenharias i Energy engineering and power technology Energy & fuels Ciências biológicas ii Ciências ambientais Ciências agrárias i Ciência de alimentos Ciência da computação Biodiversidade Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: alberto.coronas@urv.cat manel.valles@urv.cat mahmoud.bourouis@urv.cat
Author identifier: 0000-0002-6109-3680 0000-0002-0748-1287 0000-0003-2476-5967
Record's date: 2023-07-31
Papper version: info:eu-repo/semantics/acceptedVersion
Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S1359431108002305
Papper original source: Applied Thermal Engineering. 29 (5-6): 1005-1011
APA: Cerezo, Jesus; Bourouis, Mahmoud; Valles, Manel; Coronas, Alberto; Best, Roberto (2009). Experimental study of an ammonia/water bubble absorber using a plate heat exchanger for absorption refrigeration machines. Applied Thermal Engineering, 29(5-6), 1005-1011. DOI: 10.1016/j.applthermaleng.2008.05.012
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Article's DOI: 10.1016/j.applthermaleng.2008.05.012
Entity: Universitat Rovira i Virgili
Journal publication year: 2009
Publication Type: Journal Publications