Simulation of Heat Exchangers of a Window Air Conditioner Retrofitted with R-407C

Published

May 1, 2003

Author(s)

S Devotta, A S. Padalkar, N K. Sane, Piotr A. Domanski, N N. Sawant

Abstract

This paper presents the results of simulation of heat exchangers of an HCFC-22 window air conditioner retrofitted with R-407C. The test conditions considered are as per the Indian Standard IS 1391 (1992) for unitary air conditioners. The simulation has been carried out using EVAP-COND, a heat exchanger model developed by NIST. A typical Indian window air conditioner of capacity 5.13kW (1.5 TR) has been selected for the study. The performance of heat exchangers with R-407C is compared with the baseline performance with HCFC-22. The simulated results are validated by comparing with experimental results of window air conditioner retrofitted with R-407C. The assessment parameters considered are temperatures of refrigerant and air, and pressures with pressure drop in the refrigerant flow.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 the refrigerants. The exit temperatures of R-407C are lower in the range 1.9 C to 5.2 C in the condenser and are higher in the range 10.3% to 14.1% than HCFC-22. The pressure drop of R-407C is lower in both evaporator and condenser than HCFC-22. The outlet temperatures of air for HCFC-22 and R-407C in both the heat exchangers are almost similar.

Citation

International Congress of Refrigeration

Pub Type

Journals

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Keywords

air conditioner, alternative refrigerants, condenser, evaporator, modeling, refrigeration, thermodynamics, zeotropic mixtures

Citation

Devotta, S. , Padalkar, A. , Sane, N. , Domanski, P. and Sawant, N. (2003), Simulation of Heat Exchangers of a Window Air Conditioner Retrofitted with R-407C, International Congress of Refrigeration, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860905 (Accessed April 26, 2024)