A 10 degree F rise in feed-water temperature produces approximately what percentage of savings in fuel?

A 10 degree Fahrenheit rise in feed-water temperature typically results in fuel savings of approximately 1%. This relationship arises from the principles of thermodynamics and heat transfer within steam systems. When the temperature of the feedwater is increased, it takes less energy to convert this water into steam because the water is already warmer, thus requiring less fuel to achieve the desired steam output.

In practical terms, for each degree Fahrenheit rise in feed-water temperature, there is a corresponding decrease in the amount of fuel energy needed to generate steam. This thermodynamic efficiency is crucial in steam boiler operations, as even small improvements in feed-water temperature can lead to significant operational cost savings over time. Hence, the 1% fuel savings associated with a 10 degree F rise reflects a common benchmark used in the industry to illustrate the efficiency gains achievable through managing feed-water temperature effectively.