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Charge minimization in a multistage ammonia refrigeration system by introducing carbon dioxide.

Author(s) : PERAN M., JELUSIC K., PAVKOVIC B.

Summary

Preliminary analyses aimed to ammonia charge minimization in an existing two-stage ammonia refrigeration system of a cold storage are presented in the paper. The ammonia-carbon dioxide cascade system, ammonia two-stage system with carbon dioxide or ammonia two-stage system with potassium acetate as secondary fluids have been considered as possible solutions. At this preliminary stage of the study, the heat transfer in existing evaporators has been analyzed for carbon dioxide or potassium acetate as heat transfer fluids and compared with the heat transfer of ammonia. Stresses in pipelines and evaporators which appear due to increased pressure in the case of carbon dioxide application have been evaluated for the analyzed fluids. Pressure drop in pipelines has been determined for ammonia, carbon dioxide and potassium acetate. All the analyses have been performed with the goal to avoid the replacement of existing evaporators and distribution pipelines. The possible reduction of ammonia charge has been calculated as well. Efficiency of different processes has been evaluated in order to determine consequences of retrofitting on energy consumption.

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Pages: 2007-2

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Details

  • Original title: Charge minimization in a multistage ammonia refrigeration system by introducing carbon dioxide.
  • Record ID : 2007-1995
  • Languages: English
  • Source: Ammonia Refrigeration Technology for Today and Tomorrow.
  • Publication date: 2007/04/19

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