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Title: The Correlation of Coupled Heat and Mass Transfer Experimental Data for Vertical Falling Film Absorption

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 » design operating conditions of 0.62 and 0.64 mass fraction of LiBr and absorber pressures of 0.7 and 1.0 kPa.« less
Publication Date:
OSTI Identifier:
Report Number(s):
EC 12 02 00 0; ON: DE00009289
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: International Mechanical Engineering Congress and Exposition, Nashville, TN, November 14-19, 1999
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Sponsoring Org:
Gas Research Institute; USDOE Office of Science (SC)
Country of Publication:
United States
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; Absorption Refrigeration Cycle; Lithium Bromides; Heat Transfer; Mass Transfer; Correlations; Coupling