The Correlation of Coupled Heat and Mass Transfer Experimental Data for Vertical Falling Film Absorption
Abstract
Absorption chillers are gaining global acceptance as quality comfort cooling systems. These machines are the central chilling plants and the supply for cotnfort cooling for many large commercial buildings. Virtually all absorption chillers use lithium bromide (LiBr) and water as the absorption fluids. Water is the refrigerant. Research has shown LiBr to he one of the best absorption working fluids because it has a high affinity for water, releases water vapor at relatively low temperatures, and has a boiling point much higher than that of water. The heart of the chiller is the absorber, where a process of simultaneous heat and mass transfer occurs as the refrigerant water vapor is absorbed into a falling film of aqueous LiBr. The more water vapor absorbed into the falling film, the larger the chiller's capacity for supporting comfort cooling. Improving the performance of the absorber leads directly to efficiency gains for the chiller. The design of an absorber is very empirical and requires experimental data. Yet design data and correlations are sparse in the open literature. The experimental data available to date have been derived at LiBr concentrations ranging from 0.30 to 0.60 mass fraction. No literature data are readily available for themore »
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- Gas Research Institute; USDOE Office of Science (SC)
- OSTI Identifier:
- 9289
- Report Number(s):
- ORNL/CP-103983
EC 12 02 00 0; ON: DE00009289
- DOE Contract Number:
- AC05-96OR22464
- Resource Type:
- Conference
- Resource Relation:
- Conference: International Mechanical Engineering Congress and Exposition, Nashville, TN, November 14-19, 1999
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; Absorption Refrigeration Cycle; Lithium Bromides; Heat Transfer; Mass Transfer; Correlations; Coupling
Citation Formats
Keyhani, M, and Miller, W A. The Correlation of Coupled Heat and Mass Transfer Experimental Data for Vertical Falling Film Absorption. United States: N. p., 1999.
Web.
Keyhani, M, & Miller, W A. The Correlation of Coupled Heat and Mass Transfer Experimental Data for Vertical Falling Film Absorption. United States.
Keyhani, M, and Miller, W A. 1999.
"The Correlation of Coupled Heat and Mass Transfer Experimental Data for Vertical Falling Film Absorption". United States. https://www.osti.gov/servlets/purl/9289.
@article{osti_9289,
title = {The Correlation of Coupled Heat and Mass Transfer Experimental Data for Vertical Falling Film Absorption},
author = {Keyhani, M and Miller, W A},
abstractNote = {Absorption chillers are gaining global acceptance as quality comfort cooling systems. These machines are the central chilling plants and the supply for cotnfort cooling for many large commercial buildings. Virtually all absorption chillers use lithium bromide (LiBr) and water as the absorption fluids. Water is the refrigerant. Research has shown LiBr to he one of the best absorption working fluids because it has a high affinity for water, releases water vapor at relatively low temperatures, and has a boiling point much higher than that of water. The heart of the chiller is the absorber, where a process of simultaneous heat and mass transfer occurs as the refrigerant water vapor is absorbed into a falling film of aqueous LiBr. The more water vapor absorbed into the falling film, the larger the chiller's capacity for supporting comfort cooling. Improving the performance of the absorber leads directly to efficiency gains for the chiller. The design of an absorber is very empirical and requires experimental data. Yet design data and correlations are sparse in the open literature. The experimental data available to date have been derived at LiBr concentrations ranging from 0.30 to 0.60 mass fraction. No literature data are readily available for the design operating conditions of 0.62 and 0.64 mass fraction of LiBr and absorber pressures of 0.7 and 1.0 kPa.},
doi = {},
url = {https://www.osti.gov/biblio/9289},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Nov 14 00:00:00 EST 1999},
month = {Sun Nov 14 00:00:00 EST 1999}
}