- Author
-
Devotta, S.
|
Padalkar, A. S.
|
Sane, N. K.
|
Domanski, P. A.
|
Sawant, N. N.
- Title
- Simulation of Heat Exchangers of a Window Air Conditioner Retrofitted With R-407C.
- Coporate
- National Chemical Laboratory, Pune, India
Walchand College of Engineering, Sangli, India
National Institute of Standards and Technology, Gaithersburg, MD
- Report
-
IRC0048,
- Book or Conf
- International Congress of Refrigeration, 21st IIR. Proceedings. August 17-22, 2003,
Washington, DC,
1-8 p.,
2003
- Keywords
-
heat exchanger
|
air conditioning
|
refrigerants
|
evaporator
|
zeotropic mixtures
|
thermodynamics
|
simulation
|
temperature profiles
|
pressure drop
|
air temperature
- Identifiers
- condenser; rated capacity test conditions; indoor room conditions; outdoor room conditions; refrigerant condtions at the evaporator outlet; refrigerant conditions at the condenser inlet; comparison between experimental and simulated outlet air temperatures; evaporator outlet air temperature; condenser outlet air temperature
- Abstract
- This paper presents simulation results for the heat exchangers of an HCFC-22 window air conditioner retrofitted with R-407C. The test conditions are per the Indian Standard IS 1391 (1992) for unitary air conditioners. The simulation was carried out using EVAP-COND, a heat exchanger model developed by NIST. A typical Indian window air conditioner of capacity 5.13 kW (1.5 TR) was selected for the study. The performance of the heat exchangers with R-407C is compared with the baseline performance with HCFC-22. The simulation results are validated by comparing to experimental data for a window air conditioner retrofitted with R-407C. The assessment parameters are temperatures of refrigerant and air, and refrigerant pressures and pressure drops. The simulated evaporator capacity with R-407C is lower by 3.3% for the lower outdoor conditions and 6% lower for the higher outdoor conditions with respect to HCFC-22. R-407C has 6.1% lower condenser capacity for the lower outdoor conditions and 10.6% lower for the higher outdoor conditions with respect to HCFC-22. The simulated evaporator capacities are within ± 3% of the experimentally measured cooling capacities for both refrigerants. The exit temperatures of R-407C are lower by 1.9 °C to 5.2 °C in the condenser and are higher by 3.2 °C to 3.8 °C in the evaporator as compared to HCFC-22. The evaporating pressures of R-407C are higher by 4.5% to 5.3% as compared to HCFC-22. The condensing pressures of R-407C are higher by 10.3% to 14.1% as compared to HCFC-22. The pressure drop of R-407C is lower in both the evaporator and the condenser as compared to HCFC-22. The outlet temperatures of air for HCFC-22 and R-407C in both heat exchangers are nearly the same.