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Low charge ammonia evaporator with separator vessel.

Author(s) : CHRISTENSEN R.

Summary

The paper deals with possibilities to obtain low ammonia plant charges by minimizing the charge in the evaporator and separator vessel. The focus is on compact exchangers used for ammonia systems like semi-welded and AlfaNova plate heat exchangers. The charge of liquid in different parts of the system are discussed focusing on the evaporator and separator vessel parts such as drop leg, oil pot, inlet and outlet ports in the evaporator, evaporator channels and wet return line as well as the separator vessel itself. The influence of circulation rate and the impact on the charge is discussed with respect to different control methods. The importance of balancing the pressure drop in the wet return line and the evaporator by selecting the control level to obtain correct circulation rate and thus minimizing the charge is also discussed for systems using level controls. A brief discussion is held on the liquid hold up in the evaporator channels at different operating and design parameters like pressing depth, temperature approach and mean temperature differences, subcooling, etc.

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Details

  • Original title: Low charge ammonia evaporator with separator vessel.
  • Record ID : 2010-1843
  • Languages: English
  • Source: RCR 2010. 2nd IIR Workshop on Refrigerant Charge Reduction in Refrigerating Systems: Stockholm, Sweden, June 16-17, 2010.
  • Publication date: 2010/06/16

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