What is the heat value of residual fuels compared to distillate?

Residual fuels generally have a lower heat value compared to distillate fuels. The heat value is a measure of the energy that can be obtained from a fuel when it is burned. This characteristic is particularly relevant in marine engineering, as it affects engine performance and efficiency when choosing fuel types.

Residual fuels, which are derived from the heavier fractions of crude oil, tend to have a heat value that is about 6% lower than that of distillate fuels. Distillate fuels, being lighter and more refined, normally have a higher energy content, which enables better combustion efficiency, less smoke, and lower emissions. Thus, for applications where energy output is crucial, such as in ship propulsion and power generation, this distinction plays a significant role in fuel selection and operational planning.

Understanding the difference in heat value helps engineers make informed decisions regarding fuel usage, ensuring optimal operation of machinery while also considering factors like emissions and fuel costs.