Heat-transfer additives for absorption-cooling-system fluids. Annual report, October 1990-September 1991
The work was directed towards developing an analytical and physical understanding of the various phenomena, reported in the public literature, that could effect the heat and mass transfer in the absorber of an absorption chiller. Emphasis during the first year of a 3 year study was placed on compiling a comprehensive property data base and doing some simple exploratory experiments. During the second year experimental methods associated with heat and mass transfer in a falling film absorber were emphasized. Significant accomplishments the past year include: surface tension measurements for aqueous LiBr with and without additives, air solubility measurements for LiBr and LiCl, stability observations for a static film absorber, and preliminary tests with the falling film absorber apparatus for 60 wt% LiBr without surfactant additive. The solubility of surfactants n-Octanol and 2-Ethyl-1-Hexanol in 60 wt% aqueous LiBr appears to be higher than that for 50 wt% and the slope of the surface tension versus log concentration curve is much different for 60 wt% compared to 50 wt% and less. Static film experiments showed that the surface films of 60 wt% LiBr became unstable for concentrations of surfactant for less than the solubility limit found from the surface tension measurements. The conclusion is that surfactant concentrations equal to or less than that needed to lower the surface tension to that of pure water are necessary to cause instability when mass transfer takes place. Mass transfer correlations were developed for an aqueous LiBr falling film absorber with no additives. This will be used as a reference for the experimental results with additives.
- Research Organization:
- Arizona State Univ., Tempe, AZ (United States). Center for Energy Systems Research
- OSTI ID:
- 5074851
- Report Number(s):
- PB-92-190354/XAB; ASU-CR-R-92020; CNN: GRI-5089-260-1874
- Resource Relation:
- Other Information: See also PB91-182998. Sponsored by Gas Research Inst., Chicago, IL
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION REFRIGERATION CYCLE
HEAT TRANSFER
MASS TRANSFER
ADDITIVES
ADSORPTION HEAT
ALCOHOLS
ALKANES
COOLING
FILMS
HEAT PUMPS
HEAT TRANSFER FLUIDS
LITHIUM BROMIDES
LITHIUM CHLORIDES
PHYSICAL PROPERTIES
REFRIGERATING MACHINERY
SOLUBILITY
STABILITY
SURFACE TENSION
SURFACTANTS
THERMODYNAMIC PROPERTIES
WORKING FLUIDS
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
ENERGY TRANSFER
ENTHALPY
EQUIPMENT
FLUIDS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROXY COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
MACHINERY
ORGANIC COMPOUNDS
SURFACE PROPERTIES
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)