Share

OPTIMISING AN AIR COOLER WITH A THERMOSTATIC EXPANSION VALVE.

[In Norwegian. / En norvégien.]

Author(s) : BRENDENG E., AFLEKT K.

Type of article: Article

Summary

WITH INTERNALLY SMOOTH TUBES, THE BOILING HEAT TRANSFER COEFFICIENT IS LOW AT THE EVAPORATOR INLET, BUT INCREASES WITH INCREASING VAPOUR QUALITY AND VELOCITY THROUGH THE TUBES. IN THE LAST PART, IT IS AGAIN DECREASING, DUE TO LOW LIQUID CONTENT AND INSUFFICIENT WETTING OF THE TUBE WALL. THE BOILING HEAT TRANSFER MAY BE AUGMENTED BY TWISTED TAPE INSERTS IN THE TUBES. TESTS HAVE BEEN CARRIED OUT ON A COMMERCIAL AIR COOLER, WITH DIFFERENT NUMBER OF INSERTS IN THE TUBES, AS WELL AS ON AN ELECTRICALLY HEATED SINGLE TUBE EVAPORATOR, WITH AND WITHOUT INSERTS. THE IMPORTANCE OF THE TUBE LENGTH, IE THE MASS FLOW DENSITY, THE NUMBER OF INSERTS AND THE DIRECTION OF THE AIR FLOW THROUGH THE COOLER FOR THE CAPACITY OF THE AIR COOLER, IS DISCUSSED.

Details

  • Original title: [In Norwegian. / En norvĂ©gien.]
  • Record ID : 1984-2273
  • Languages: Norwegian
  • Source: Scand. Refrig. - vol. 13 - n. 2
  • Publication date: 1984/04
  • Document available for consultation in the library of the IIR headquarters only.

Links


See other articles in this issue (2)
See the source

Indexing