Computer simulation of absorption heat pump using aqueous lithium bromide and ternary nitrate mixtures
A new aqueous ternary mixture consisting of 53 wt % LiNO/sub 3/, 28 wt % KNO/sub 3/, and 19 wt % NaNO/sub 3/is available for high-temperature heat pump applications. The pressure-composition-temperature and the specific enthalpy-concentration-temperature data in the form of correlated polynomial expressions are used in a computer program to simulate results of a temperature amplifier heat pump with LiBr/H/sub 2/O and ternary nitrate/H/sub 2/O mixtures as working fluids. In the absence of adequate thermophysical data for the fluids, the study serves as a best guess first approximation. The results show that the ternary nitrate mixture potentially has approximately a 10% advantage in COP and a 15% advantage in temperature lifts over aqueous LiBr at high temperatures. Ternary nitrates are hampered by crystallization at low waste heat temperatures and cannot operate competitively in the low lift and waste heat temperature regions. The potential performance advantage at high temperatures for the ternary nitrate mixture is sufficiently attractive to justify additional work to obtain adequate thermodynamic transport and corrosion data. 10 refs., 11 figs.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6955013
- Report Number(s):
- ORNL/TM-10392; ON: DE88013353
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
HEAT PUMPS
COMPUTERIZED SIMULATION
WORKING FLUIDS
LITHIUM BROMIDES
PERFORMANCE
LITHIUM NITRATES
POTASSIUM NITRATES
SODIUM NITRATES
AQUEOUS SOLUTIONS
COMPARATIVE EVALUATIONS
ENTHALPY
EQUATIONS
HEAT TRANSFER
MIXTURES
PHYSICAL PROPERTIES
TEMPERATURE EFFECTS
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
DISPERSIONS
ENERGY TRANSFER
FLUIDS
HALIDES
HALOGEN COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
SIMULATION
SODIUM COMPOUNDS
SOLUTIONS
THERMODYNAMIC PROPERTIES
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
360603 - Materials- Properties