Simulated performance of absorption heat pumps using a mixed aqueous nitrate working fluid

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5111568

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 (P-X-T) and the specific enthalpy-concentration-temperature (H-X-T) data in the form of correlated polynomial expressions are used in a computer program to simulate results of a temperature amplifier heat pump with LiBrH/sub 2/O and ternary nitrateH/sub 2/O mixtures as working fluids. Although the limits of applicability of the two fluids are different, there is a region of commonality where the comparison can be made. The difficulties are lack of adequate thermophysical data on both mixtures in the temperature ranges of interest. In the absence of adequate thermophysical data, for the mixtures, the study serves as a ''best case'' first approximation. The results show that the ternary nitrate mixtures potentially have approximately a 10% advantage in COP and a 15% advantage in temperature lifts over aqueous lithium bromide mixtures at high temperatures. Ternary nitrates are hampered by crystallization at low waste heat temperatures and cannot operate competitively in the low lift and temperature boost regions. This potential performance advantage at high temperatures for the ternary nitrate mixtures is justification for additional work to obtain adequate thermodynamic transport and corrosion data.

• OSTI ID: 5111568
• Report Number(s): CONF-871234-
• Resource Relation: Conference: ASME winter meeting, Boston, MA, USA, 13 Dec 1987; Other Information: Technical Paper 87-WA/AES-2
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
20 FOSSIL-FUELED POWER PLANTS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HEAT PUMPS
COMPUTERIZED SIMULATION
CORROSION
PERFORMANCE TESTING
TECHNOLOGY ASSESSMENT
THERMODYNAMICS
AQUEOUS SOLUTIONS
COMPUTER CODES
CRYSTALLIZATION
ENTHALPY
HIGH TEMPERATURE
LITHIUM NITRATES
POTASSIUM NITRATES
SODIUM NITRATES
TERNARY FISSION
ALKALI METAL COMPOUNDS
CHEMICAL REACTIONS
DISPERSIONS
FISSION
LITHIUM COMPOUNDS
MIXTURES
NITRATES
NITROGEN COMPOUNDS
NUCLEAR REACTIONS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
SIMULATION
SODIUM COMPOUNDS
SOLUTIONS
TESTING
THERMODYNAMIC PROPERTIES
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry
360105 - Metals & Alloys- Corrosion & Erosion
200101 - Fossil-Fueled Power Plants- Cooling & Heat Transfer Equipment & Systems
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)