Share

TWO-STAGE SCREW COMPRESSORS IN A QUICK FREEZING PLANT.

Author(s) : RENZ H.

Type of article: Article

Summary

THE AUTHOR DESCRIBES A RELATIVELY SMALL TWO-STAGE SYSTEM USING SCREW COMPRESSORS AND AN AIR-COOLED CONDENSER. BECAUSE OF THE INCREASED VOLUMETRIC EFFICIENCY OFSCREW COMPRESSORS OPERATING ON R22 COMPARED WITH PISTON COMPRESSORS, IT WAS DECIDED TO USE SMALL SEMI-HERMETIC SCREW COMPRESSORS FOR BOTH HIGH AND LOW STAGES. THE SYSTEM HAS A NUMBER OF ADVANTAGES. OIL RETURN IS SIMPLE -THE SUMP OF AN OIL SEPARATOR AFTER THE LOW STAGE MACHINES CAN TOP UP THE HIGH STAGE SEPARATOR BY A FLOAT CONTROLLED RETURN INJECTING OIL INTO THE HIGH STAGE SUCTION. AN AIR HEATED DEFROST EVAPORATOR IS FITTED ON A BYPASS TO THE LOW STAGE SUCTION LINE, SOTHAT HOT GAS DEFROST CAN BE USED. THE DEFROST EVAPORATOR IS MOUNTED TO MAKE USE OF CONDENSER DISCHARGE AIR. THE CIRCUIT ALSO CONTAINS A HIGH STAGE DESUPERHEATER TO SUPPLY DOMESTIC HOT WATER. INTERMEDIATE LIQUID COOLING IS BY DIRECT EXPANSION WITH AN OVERSPILL TO DESUPERHEAT INTERSTAGE VAPOUR. THE . D.W.H.

Details

  • Original title: TWO-STAGE SCREW COMPRESSORS IN A QUICK FREEZING PLANT.
  • Record ID : 1987-1309
  • Languages: English
  • Source: Scand. Refrig./Refrig. Air Cond. Heat Recov. - vol. 89 - n. 1,063
  • Publication date: 1986
  • Document available for consultation in the library of the IIR headquarters only.

Links


See the source

Indexing