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Detection of liquid mass fraction at the evaporator exit of refrigeration systems.

Author(s) : HRNJAK P. S., SHANNON M. A., LEICHT T. M., et al.

Type of article: Article

Summary

The article presents four methods of detecting droplets in the stream of superheated vapour at the evaporator exit of refrigeration systems: a) an energy balance, b) a thin-film resistance (MEMS) sensor developed for this project, c) a laser and photodiode for measuring light scattered by entrained droplets, and d) an exposed beaded thermocouple. Three configurations of the plate evaporator are examined, with refrigerant flow controlled by: 1) a thermostatic expansion valve, 2) a manual valve, and 3) a separate liquid injector used to examine the detection of controlled flow droplets. The signals were recorded at both slow (0.5 Hz) and fast (40 Hz) rates in order to characterize the unsteady flow exiting the evaporator.

Details

  • Original title: Detection of liquid mass fraction at the evaporator exit of refrigeration systems.
  • Record ID : 2002-2296
  • Languages: English
  • Source: International Journal of thermal Sciences - vol. 40 - n. 8
  • Publication date: 2001/09

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