Abstract
The single screw compressor is widely used in air and water cooled central air conditioning systems for various unique characteristics compared to other compressors. It is possible to control the cooling or heating capacity by adjusting the mechanical slides built inside this type of compressor. However, the efficiency of the compressor is drastically reduced at part load conditions if the capacity is controlled by mechanical slides. We have studied the effect of volume index on performance when the capacity is controlled by varying the speed of the compressor. The volume index is varied by changing the position of the mechanical slides and the optimum volume index is obtained for rated and part load conditions. This paper will present the results of this study and propose the optimum volume index for obtaining best annual performance of the compressor.
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