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EXERGETIC ANALYSIS OF MULTISTAGE VAPOUR COMPRESSION REFRIGERATION CYCLES.

[In Italian. / En italien.]

Author(s) : FORNASIERI E.

Type of article: Article

Summary

REFRIGERATION CYCLES WITH MULTISTAGE COMPRESSION AND EXPANSION ARE ANALYSED BY USING AN EXERGY STATE FUNCTION. THE SUBDIVISION OF OVERALL EXERGY LOSS INTO SINGLE TERMS ENABLES ONE TO DETECT THE MOST UNFAVOURABLE PROCESSES FOR CYCLE THERMODYNAMIC EFFICIENCY AND TO EVALUATE THE EFFICIENCY OF MEANS USED TO IMPROVE SYSTEM PERFORMANCE. REFERENCE IS MADE TO BOTH CYCLES WITH ISENTROPIC AND REAL COMPRESSION PROCESSES. SINCE THE MOST RELEVANT EXERGY LOSSES IN REAL CYCLES REFER TO THE COMPRESSION PROCESS AND STRONGLY DEPEND UPON THE PRESSURE RATIO, IT IS SHOWN THAT THE NORMAL HYPOTHESIS OF CONSTANT ISENTROPIC COMPRESSION EFFICIENCY LEADS TO WRONG CONCLUSIONS. FOR INSTANCE, IN THIS HYPOTHESIS, OVERALL LOSS REDUCES INDEFINITELY AS THE STAGE NUMBER INCREASES WHILE IN REAL CYCLES THE MINIMAL LOSS OCCURS WITH ONE STAGE AT AN EVAPORATION TEMPERATURE NOT LOWER THAN 263 TO 258 K (-10 TO -15 DEG C) AND WITH TWO STAGES FOR EVAPORATION TEMPERATURE RANGING FROM 263 TO 258 K -40 DEG C). E. F.

Details

  • Original title: [In Italian. / En italien.]
  • Record ID : 1985-1392
  • Languages: Italian
  • Source: Industria italiana del Freddo - vol. 38 - n. 4
  • Publication date: 1984
  • Document available for consultation in the library of the IIR headquarters only.

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