Superheated Steam
If the saturated steam produced in a boiler is exposed to a surface with a higher temperature, its temperature will increase above the evaporating temperature. ... for a horizontal steam coil surrounded with water, 'U' values might be as low as 50 to 100 W/m² °C for superheated steam but 1 200 W/m² °C for saturated steam, as depicted in ...
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