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

Download Paper

Local Download

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 December 26, 2024)