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USING A REVERSE GAS CYCLE IN REFRIGERATING SYSTEMS.

[In Italian. / En italien.]

Author(s) : FANTINI L., NANNEI E.

Type of article: Article

Summary

A REVERSE GASCYCLE IS REGARDED AS A POSSIBLE CFC-CYCLE SUBSTITUTE IN REFRIGERATION. IT IS EXTENSIVELY EMPLOYED IN AIR CONDITIONING ON AIRCRAFT AND IS EXPECTED TO IMPROVE ITS EFFICIENCY IN GROUND INSTALLATIONS. IN THE FIRST PART, THE REVERSE GAS CYCLEIS INVESTIGATED THEORETICALLY WITH DRY AIR AS THE OPERATING FLUID; THE AUTHORS CONCLUDE THAT, WITH A PRESSURE RATIO RANGING FROM 1.5 TO 3, IT IS POSSIBLE TO ATTAIN A TEMPERATURE LOW ENOUGH FOR AIR CONDITIONING OR FOODSTUFF PRESERVATION. TECHNOLOGY NOWADAYS ALLOWS THE COP TO REACH AN ACCEPTABLE VALUE. IN THE SECOND PART, THE EFFECT OF HUMIDITY CONDENSATION DURING EXPANSION IS EXAMINED FROM THE POINT OF VIEW OF THE CYCLE PERFORMANCE. TWO DIFFERENT HYPOTHESES ARE MADE ABOUT THE EXPANSION PROCESS: (I) A PERFECT THERMAL EQUILIBRIUM BETWEEN WATER AND AIR, AND (II) A METASTABLE EXPANSION PROCESS, WITHOUT ANY THERMAL EXCHANGE BETWEEN AIR AND WATER, FOLLOWED BY THE CONDENSATION. THE AIR TEMPERATURE AT ERATING EFFECT ARE FOUND TO BE SIMILAR FOR BOTH HYPOTHESES, WHEREAS THE COP IS SLIGHTLY HIGHER FOR THE FIRST ONE. THE MINIMUM TEMPERATURE OF THE CYCLE, ALTHOUGH HIGHER THAN THE ONE ATTAINABLE WITH DRY AIR, IS YET SUITABLE FOR THE APPLICATION CONSIDERED HERE. E. F.

Details

  • Original title: [In Italian. / En italien.]
  • Record ID : 1992-0482
  • Languages: Italian
  • Source: Industria italiana del Freddo - vol. 45 - n. 2
  • Publication date: 1991
  • Document available for consultation in the library of the IIR headquarters only.

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