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Diabatic flow instabilities in capillary tube-suction line heat exchangers.

Author(s) : LIU Y., BULLARD C. W.

Summary

Three capillary tube-suction line heat exchangers were tested under steady and quasi-steady conditions over a range of subcooled inlet temperatures and pressures, and mass flows were measured with a coriolis-type meter. Hysteresis was observed; mass flow rate is multivalued and depends on whether the flash point is moving upstream or downstream. Additional experiments were conducted with capillary tube inlet conditions held constant while suction inlet superheat was varied, and the phenomenon was observed again. The same effect was reproduced in an operating refrigerator; affecting its thermodynamic cycle efficiency by 3%. Designers using steady-state models based on equilibrium thermodynamic assumptions must live with this uncertainty until more is known about metastable behaviour and its patch-dependence.

Details

  • Original title: Diabatic flow instabilities in capillary tube-suction line heat exchangers.
  • Record ID : 2001-0797
  • Languages: English
  • Source: ASHRAE Transactions. 2000 Winter Meeting, Dallas, Texas + CD-ROM.
  • Publication date: 2000
  • Document available for consultation in the library of the IIR headquarters only.

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