Superheated Steam
For steam to oil applications, the 'U' values might be considerably less, perhaps as low as 20 W/m² °C for superheated steam and 150 W/m² °C for saturated steam. In a shell and tube heat exchanger, 100 W/m² °C for superheated steam and 500 W/m² °C for saturated steam can be expected.
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