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RECIPROCATING COMPRESSORS AND SCREW COMPRESSORS: A COMPARISON BETWEEN DIFFERENT TECHNOLOGIES WITH REFERENCE TO THE CFC ISSUE.

[In Italian. / En italien.]

Author(s) : STENZEL A.

Type of article: Article

Summary

THE AUTHOR POINTS OUT THE PROBLEM OF REPLACING R502 WITH A SAFER REFRIGERANT IN LOW-TEMPERATURE REFRIGERATING CIRCUITS FOR RETAIL SALE. R22 IS SEEN AS A POSSIBLE SUBSTITUTE FOR R502, ON CONDITION THAT THE TEMPERATURE OF THE COMPRESSED GAS IS PREVENTED FROM ATTAINING TOO HIGH VALUES. FOR THIS PURPOSE, THERE ARE TWO MEASURES: A) THE USE OF TWO-STAGE CYCLES ; B) THE USE OF A SCREW COMPRESSOR. THE AUTHOR THINKS THAT A SCREW COMPRESSOR IS THE BEST SOLUTION, AS THE INTERNAL COOLING BY OIL INJECTION HAS PROVED TO BE EFFECTIVE IN CONTROLLING THE GAS TEMPERATURE, AT THE DISCHARGE SIDE, EVEN WITH VERY HIGH PRESSURE RATIOS. MOREOVER, THE SCREW COMPRESSOR CAN OPERATE EFFICIENTLY, AT REDUCED SPEED, SO IT IS SUITABLE FOR STEPLESS CAPACITY CONTROL CARRIED OUT WITH FREQUENCY CONVERTERS. E. F.

Details

  • Original title: [In Italian. / En italien.]
  • Record ID : 1991-1525
  • Languages: Italian
  • Source: Industria italiana del Freddo - vol. 44 - n. 5
  • Publication date: 1990
  • Document available for consultation in the library of the IIR headquarters only.

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