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What is terminal temperature difference (TTD) in closed feedwater heaters (FWH)?
What is terminal temperature difference (TTD) in closed feedwater heaters (FWH)?
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The water exit temperature at 9 can not reach the inlet bled steam temperature. A terminal temperature difference is defined for all closed feedwater heaters as
TTD = saturation temperature of bled steam - exit water temperature
TTD = t7 - t9