An inverter controlled refrigeration system with a variable speed compressor is more efficient. In order to improve its efficiency and reliability in wide range of speed, a comprehensive simulation model for an inverter rotary compressor with single cylinder or dual cylinder is developed. The simulated results are compared with measured data. The variations of cooling capacity, input power, COP, various efficiencies and losses, and closing angle and impacting velocity of reed valve are analyzed. The pressure variations in working chambers at various speeds and their effects are explained. That the fluctuation of rotating speed of a single cylinder compressor operating at low speed produces the great difference between the practical and rated efficiency of motor is shown.
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