What is the purpose of an oil-to-fuel heat exchanger?

An oil-to-fuel heat exchanger serves a critical role in improving the efficiency of aircraft engines by cooling the oil while simultaneously heating the fuel. The oil in the engine operates at a higher temperature and needs to be cooled to maintain optimal viscosity and performance, while the fuel is usually brought in at a lower temperature. By transferring heat from the warm oil to the cooler fuel, the heat exchanger increases the temperature of the fuel before it enters the combustion chamber. This process enhances the fuel's atomization and combustion efficiency, leading to better engine performance and reduced emissions.

The design of the heat exchanger focuses specifically on enabling this dual function of cooling and heating. This is essential in maintaining engine performance and safety, ensuring that components operate within their design temperature ranges.