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IIR document

Hot gas defrost of low temperature refrigeration evaporators with natural refrigerants.

Number: pap. n. 137

Author(s) : MIKHAILOV A., KORTSTEE J.

Summary

Industrial refrigeration systems predominantly use natural refrigerants, primarily ammonia and more recently CO2. Energy efficiency and the effective operation of those systems are the key parameters for operators of the plants. The focus of the article is the comparison of hot gas defrost strategy control methods, both on the hot gas side as well as on the condensate drain. The key parameters analysed on this paper are the efficiency as well as the speed of defrost, which is especially important for the productivity of the freezing plant. The authors suggest opportunities to improve controls for hot gas defrost systems. The article describes hot gas defrost for ammonia systems, indicating special requirements for CO2 plants where relevant. Some of those requirements are derived from higher pressures and higher pressure differentials with CO2. The article indicates that when defrost is performed in an optimal way could save up to 5% of the plant energy consumption or even more.

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Pages: 8 p.

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Details

  • Original title: Hot gas defrost of low temperature refrigeration evaporators with natural refrigerants.
  • Record ID : 30005015
  • Languages: English
  • Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Publication date: 2012/06/25

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