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FAQ

Technical selection and refrigerants

  • Which fouling factors does Onda suggest for the selection of shell and tube heat exchangers?

    The fouling factor is important for the selection of an evaporator. The value Onda suggest to input in selection software are:

    For evaporators:
    -    Normal water in closed circuit: 0,000043 m2K/W;
    -    Water in open circuit: 0,000086 m2K/W;
    -    Solutions with glycol <40%: 0,000086 m2K/W;
    -    Solutions with glycol >40%: 0,000172 m2K/W.

    For condensers:
    -    Normal city water: 0,000043 m2K/W;
    -    Treated tower water: 0,000043 m2K/W;
    -    River water: 0,000086 m2K/W;
    -    Solutions with glycol <40%: 0,000086 m2K/W;
    -    Solutions with glycol >40%: 0,000172 m2K/W.

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