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An Evaluation of the Effects of Refrigerant Charge on a Residential Central Air Conditioner with Orifice Expansion
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Recent studies have been conducted at Texas A & M University to quantify the effect of over/undercharging on the performance of a residential central air conditioner with two different expansion devices: capillary tubes and thermal expansion valves. A third expansion device, the short-tube orifice, is used by many manufacturers of residential air conditioners. This report summarizes the results of experiments performed for the Trane Dealer Products Group on a Trane central air conditioner which utilized short-tube orifices for flow control. The project was conducted under Trane Purchase Order No. TYR1020264- T280D.
DescriptionThe report is divided into 5 chapters in addition to the this chapter. Chapter 2 describes the experimental facilities and procedures used to collect and analyze data. Results are presented in Chapters 3 through 5. In all three orifices were tested. In chapter 3, data for the nominal size orifice are presented first. Data on the other two orifices are presented in Chapter 4. Comparisons between the three orifices are presented in Chapter 5. Conclusions are provided in Chapter 6.
residential central air conditioner
thermal expansion device
- Technical Reports 
O'Neal, D. L.; Ramsey, C. J.; Farzad, M. (1989). An Evaluation of the Effects of Refrigerant Charge on a Residential Central Air Conditioner with Orifice Expansion. Energy Systems Laboratory (http://esl.tamu.edu), Texas A&M University; Department of Mechanical Engineering, Texas A&M University. Available electronically from