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Non adiabatic capillary tubes in cycle simulations.

Number: pap. 2261

Author(s) : HEIMEL M., BERGER E., POSCH S., et al.

Summary

Capillary tubes including a suction line heat exchanger are typical expansion devices used in nowadays domestic refrigeration appliances. To account for their functionality in transient cycle simulations, including the highly transient start-up and shut-down operations, different capillary tube models and their implementation in such a cycle are investigated. These non-adiabatic capillary tube models comprise dimensionless correlations, neural network methods and one-dimensional homogeneous models which stem partly from open literature and from previous work of the authors. The range of parameters is chosen according to the need of domestic applications using R600a - mass flow rates range between 0 and 3 kg/h and inlet pressures up to 6 bar. It is concluded that the direct implementation of the 1d-code bears the disadvantage of low speed, whereas common dimensionless correlations lose accuracy off its design point. Neural networks turn out to be a good trade-off between speed, reliability and accuracy.

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Pages: 10 p.

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Details

  • Original title: Non adiabatic capillary tubes in cycle simulations.
  • Record ID : 30013249
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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