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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019026621
pages 609-621

COMPARISON BETWEEN ADIABATIC AND NONADIABATIC ABSORPTION CHILLERS USING AMMONIA-LITHIUM NITRATE AND WATER-LITHIUM BROMIDE SOLUTIONS

Alejandro Zacarias
Instituto Politécnico Nacional, ESIME Azcapotzalco, Av. de las Granjas 682, Col. Santa Catarina, 02250, Ciudad de México, México
J. A. Quiroz
Instituto Politécnico Nacional, ESIME Azcapotzalco, Av. de las Granjas 682, Col. Santa Catarina, 02250, Ciudad de México, México
Geydy Luz Gutiérrez-Urueta
Departamento de Ingenieria Mecánica-Eléctrica, Universidad Autónoma de San Luis Potosi, Dr. Manuel Nava No. 8, Zona Universitaria Poniente, 78290, San Luis Potosi, México
M. Venegas
Unidad Asociada de Ingenieria Termicay de Fluidos CSIC-UC3M; Departamento de Ingenieria Termicay de Fluidos, Universidad Carlos III de Madrid, Avda. Universidad, 30, 28911 Leganes, Madrid, Spain
Ignacio Carvajal
Instituto Politécnico Nacional, ESIME, UPALM, Ciudad de México 07738, México
J. Rubio
Instituto Politécnico Nacional, ESIME Azcapotzalco, Av. de las Granjas 682, Col. Santa Catarina, 02250, Ciudad de México, México

RÉSUMÉ

This work deals with the comparison of the performance of a single-effect absorption chiller using two main configurations: equipped with a nonadiabatic absorber or an adiabatic one. Simulations were developed based on thermodynamic balances, operating with ammonia-lithium nitrate (NH3−LiNO3) and water-lithium bromide (H2O−LiBr) as working pairs. Parameters of evaluation are the coefficient of performance COP, circulation ratio f, and driving heat rate Qg. Results illustrate that the nonadiabatic absorption system presents better performance parameters for a given operating point, attributable to a higher concentration change in the absorber for a fixed cooling capacity. When the generator temperature Tg is varied, a strong influence on the performance parameters f, Qg, and COP is observed. However, from a certain value of Tg its variation has a less influence on the performance. When the condenser temperature increases, the COP decreases. The contrary happens if the evaporation temperature is increased. This is valid for both adiabatic and nonadiabatic cases.

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