Optimization strategies for unitary air conditioners using R-410A

摘要

R-410A (AZ-20) has achieved broad acceptance as the ultimate replacement for HCFC-22 in residential air conditioning Systems. This paper examines the design optimization of this type of equipment based on the use of R-410A. The Oak Ridge Heat Pump Model (MARK V or Purez) is utilized in this study for steady-state performance simulation. Efficiency levels corresponding to SEER levels of 10,11,12,13, and 14 are examined for a typical nominal 3 ton split system. This study included an assessment ofthe cost and equipment size impacts of coil circuiting, alternative tube diameters, and compressor efficiency. The early market price of the HFC alternative refrigerants will likely to be higher than R-22, which will play a larger role in equipment design than has been typical in the recent past. The envelope of conventional design practice is pushed to examine operation at extreme conditions. The potential for supercritical heat rejection and its effect on system operating parameters is evaluated.