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Electronic expansion valves versus thermal expansion valves.

Author(s) : LAZZARIN R., NARDOTTO D., NORO M.

Type of article: Article

Summary

Storing cold and frozen foods uses approximately 40 to 50% of electricity in supermarkets. Open vertical display cabinets, in particular, are large users of electrical energy. Many refrigerating machines use thermostatic expansion valves (TEVs). TEVs are the most widespread expansion device, but they have some characteristics that can limit versatility and performance of the machines. For example, this valve requires a minimum pressure drop between condensation and evaporation. This prevents possible advantages of low condenser pressure for air-cooled condensers. A minimum amount of superheating must be provided to avoid possible hunting of the valve.

Details

  • Original title: Electronic expansion valves versus thermal expansion valves.
  • Record ID : 2009-1098
  • Languages: English
  • Source: ASHRAE Journal - vol. 51 - n. 2
  • Publication date: 2009/02

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