This paper reports the experimental data of boiling heat transfer coefficients for the ammonia–lithium nitrate mixture in a laminar falling film. The analyzed heat exchanger consists of a shell with an internal helical coil. More than one hundred test runs were carried out in steady-state conditions to determine the boiling heat transfer coefficients at generation temperatures, concentrations, and mass flow rates typical of absorption cooling systems of capacities between 5 and 10 kW. Ammonia vapor was produced at generation temperatures between 80 °C and 105 °C obtaining boiling heat transfer coefficients between 85 and 340 W/m2K. Semi-empirical correlations were used by diverse authors to correlate the experimental data. A new correlation was proposed with which the best adjustments were obtained. Also, the influence of the heat flux, the refrigerant solution mass flow rates, and the exit vapor qualities were analyzed in the boiling heat transfer coefficients.
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Research-Article
Boiling Heat Transfer Coefficients in a Falling Film Helical Coil Heat Exchanger for the NH3–LiNO3 Mixture
J. A. Hernández-Magallanes,
J. A. Hernández-Magallanes
Facultad de Ciencias Químicas,
Universidad Autónoma de Nuevo León,
Av. Universidad s/n, Ciudad Universitaria,
San Nicolás de los Garza,
Nuevo León 66455, México
Universidad Autónoma de Nuevo León,
Av. Universidad s/n, Ciudad Universitaria,
San Nicolás de los Garza,
Nuevo León 66455, México
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W. Rivera
W. Rivera
Instituto de Energías Renovables,
Universidad Nacional Autónoma
de México (UNAM),
Temixco, Morelos 62580, México
e-mail: wrgf@ier.unam.mx
Universidad Nacional Autónoma
de México (UNAM),
Temixco, Morelos 62580, México
e-mail: wrgf@ier.unam.mx
1Corresponding author.
Search for other works by this author on:
J. A. Hernández-Magallanes
Facultad de Ciencias Químicas,
Universidad Autónoma de Nuevo León,
Av. Universidad s/n, Ciudad Universitaria,
San Nicolás de los Garza,
Nuevo León 66455, México
Universidad Autónoma de Nuevo León,
Av. Universidad s/n, Ciudad Universitaria,
San Nicolás de los Garza,
Nuevo León 66455, México
W. Rivera
Instituto de Energías Renovables,
Universidad Nacional Autónoma
de México (UNAM),
Temixco, Morelos 62580, México
e-mail: wrgf@ier.unam.mx
Universidad Nacional Autónoma
de México (UNAM),
Temixco, Morelos 62580, México
e-mail: wrgf@ier.unam.mx
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 19, 2018; final manuscript received March 19, 2019; published online May 17, 2019. Assoc. Editor: Amitabh Narain.
J. Heat Transfer. Jul 2019, 141(7): 071502 (11 pages)
Published Online: May 17, 2019
Article history
Received:
January 19, 2018
Revised:
March 19, 2019
Citation
Hernández-Magallanes, J. A., and Rivera, W. (May 17, 2019). "Boiling Heat Transfer Coefficients in a Falling Film Helical Coil Heat Exchanger for the NH3–LiNO3 Mixture." ASME. J. Heat Transfer. July 2019; 141(7): 071502. https://doi.org/10.1115/1.4043300
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