By how much does steam generator efficiency increase for every 5.5℃ to 6℃ rise in feedwater temperature?

The efficiency of a steam generator can be significantly influenced by changes in the temperature of the feedwater. For each incremental rise in feedwater temperature of approximately 5.5℃ to 6℃, the efficiency is known to improve by about 1%.

This occurs because warmer feedwater requires less heat input from the energy source (such as burning fuel or waste heat) to reach its boiling point and convert into steam. As a result, the steam generator operates more effectively, making better use of its energy input.

Understanding this relationship is crucial for power engineers, as optimizing feedwater temperature can lead to improved performance and reduced operational costs. Therefore, the correct answer reflects the practical efficiency improvements achievable through careful management of feedwater temperature in steam generators.