Computer simulation of absorption heat pump using aqueous lithium bromide and ternary nitrate mixtures

Technical Report · Wed Jun 01 04:00:00 EDT 1988

DOI:https://doi.org/10.2172/6955013· OSTI ID:6955013

Ally, M. R.

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., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6955013
• Report Number(s): ORNL/TM-10392; ON: DE88013353
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
BROMIDES
BROMINE COMPOUNDS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DISPERSIONS
ENERGY TRANSFER
ENTHALPY
EQUATIONS
FLUIDS
HALIDES
HALOGEN COMPOUNDS
HEAT PUMPS
HEAT TRANSFER
LITHIUM BROMIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
LITHIUM NITRATES
MIXTURES
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
SIMULATION
SODIUM COMPOUNDS
SODIUM NITRATES
SOLUTIONS
TEMPERATURE EFFECTS
THERMODYNAMIC PROPERTIES
WORKING FLUIDS