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Boiling of NH3/lubricant mixture on a horizontal enhanced tube in a flooded evaporator with inlet vapour quality.

Author(s) : ZHENG J., CHYU M. C., AYUB Z.

Summary

In a flooded evaporator of an ammonia vapour-compression refrigeration system, boiling commonly takes place with ammonia mixed with compressor lubricant and subjected to a vapour quality at the inlet of the evaporator. In this study, flooded boiling tests of ammonia on an enhanced tube under simultaneous influence of a miscible lubricant and inlet quality were conducted. The results suggest that enhancement is observed with the enhanced tube and further more the boiling heat transfer coefficient increases with both saturation temperature and heat flux. The coefficient slightly increases or does not significantly vary with the inlet quality. Heat transfer performance increases and decreases with lubricant concentration however never higher than with no-oil concentration. The lubricant effect is generally more significant than the inlet quality effect. A correlation was developed based on the present data for flooded boiling of lubricant/ammonia mixture on enhanced horizontal tube under the influence of inlet quality.

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Pages: 2006-2

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Details

  • Original title: Boiling of NH3/lubricant mixture on a horizontal enhanced tube in a flooded evaporator with inlet vapour quality.
  • Record ID : 2007-1454
  • Languages: English
  • Source: 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006). Proceedings
  • Publication date: 2006/05/29

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