Prediction of cyclic heat pump performance with a fully distributed model and a comparison with experimental data
A dynamic model of vapor compression heat pumps is presented. Due to the importance of thermal expansion and compressibility effects, a detailed mathematical treatment is given of the condenser, evaporator, and accumulator. A brief description is presented of the solution methodology employed in the complete heat pump model. Lumped-parameter models were developed for the expansion device, natural-gas-fueled IC engine, and compressor (open and hermetic). However, due to space limitations, these models will not be presented. Since inclusion of an appropriate void fraction model was found to be essential in determining the detailed refrigerant mass distribution, this topic is also discussed. Simulation results and experimental data are favorably compared for transient operation of a hermetic water-to-water heat pump and an air-to-air system with an open compressor. The spatial variations of temperature, enthalpy, mass flow rate, and density are predicted at each point in time for the two heat exchangers. The refrigerant pressures in the condenser and evaporator are determined such that the boundary conditions for the governing set of parabolic partial differential equations are satisfied. The summary provides a list of ongoing work in the area of heat pump simulation and applications.
- Research Organization:
- Honeywell Corporate Systems Development Div., Minneapolis, MN (US)
- OSTI ID:
- 6425011
- Report Number(s):
- CONF-870620-
- Journal Information:
- ASHRAE Trans.; (United States), Vol. 93:2; Conference: Annual meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Nashville, TN, USA, 28 Jun 1987; Other Information: Technical Paper NT-87-05-2
- Country of Publication:
- United States
- Language:
- English
Similar Records
The Oak Ridge National Laboratory automobile heat pump model: User`s guide
An automobile air conditioner design model
Related Subjects
33 ADVANCED PROPULSION SYSTEMS
HEAT PUMPS
PERFORMANCE
ACCUMULATORS
AIR SOURCE HEAT PUMPS
CONDENSERS
DATA ANALYSIS
EVAPORATORS
HYDRODYNAMICS
INTERNAL COMBUSTION ENGINES
MATHEMATICAL MODELS
NATURAL GAS
REFRIGERANTS
THERMODYNAMICS
VOID FRACTION
WATER SOURCE HEAT PUMPS
CONTAINERS
ENERGY SOURCES
ENGINES
FLUID MECHANICS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HEAT ENGINES
MECHANICS
TANKS
WORKING FLUIDS
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
330100 - Internal Combustion Engines