Steam
The simple steam to air heating coil model only does sensible heating of the air. The steam to air coils condenses the steam and sub cools steam at loop pressure and discharges the condensate through steam traps at low pressure condensate line.
Condensate Sub Cool - Coil
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Default: 41°F/5°C
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Typical Range: NA
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Min Max: 35.6 to 999,999,999
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Units: °F/°C
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Ideally the steam trap located at the outlet of steam coil should remove all the condensate immediately, however there is a delay in this process in actual systems which causes the condensate to SubCool by certain degree in the coil before leaving the coil, this SubCool occurs in the steam coil and this SubCool-heat is added to the zone.
Condensate Sub Cool - Loop
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Default: 68°F/20°C
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Typical Range: NA
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Min Max: 50 to 999,999,999
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Units: °F/°C
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This essentially represents the heat loss to the atmosphere due to uninsulated condensate return piping to the boiler. Condensate return piping operates at atmospheric pressure and is not insulated. The condensate sub cools to certain degree before it is pumped back to the boiler.