A Balanced View of Reciprocating and Screw Compressor Effici
A Balanced View of Reciprocating and Screw Compressor Efficiencies (1980)-"The company has been engaged in reciprocating compressor design since the turn of the century and in double rotor screw compressor design since 1969. During the last five years a thorough test programme has been carried out in co-operation with Norges Tekniske Hogskole, University of Trondheim, on our reciprocating compressor design to determine the exact influence of the various design parameters on compressor efficiency. In particular the optimal design of the ring plate type suction and discharge valves has been studied. The paper will report on the variations in volumetric and isentropic efficiencies both for R22 and R717, in relation to speed, length of stroke, valve spring design, compression ratio, etc. The results obtained with the reciprocating compressor are compared with those for the double rotor screw compressor, based on experience from more than 1000 units supplied, and on various results obtained on the company's behalf by the licenser's laboratory. The differences are explained, and the conclusion is substantiated that both types of positive displacement compressors have their own merits, and that they complement each other to the extent that they may often be combined in one plant to obtain the most energy efficient installation under variable operating conditions."
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