Heat exchange system using compressor air for fuel pre-heating

A heat exchange system for an aircraft engine, comprising:

• a fuel conduit flowing a fuel flow when the aircraft engine is in use;
• an oil conduit flowing an oil flow when the aircraft engine is in use;
• a first heat exchanger having a fuel passage in fluid communication with the fuel conduit and an oil passage in fluid communication with the oil conduit, the fuel passage in heat exchange relationship with the oil passage;
• and
• a second heat exchanger having a fluid passage and an air passage fluidly separated from and in heat exchange relationship with the fluid passage, the air passage in fluid communication with an air outlet of a compressor of the aircraft engine, the air passage flowing a flow of compressed air from the compressor when the aircraft engine is in use, the fluid passage in fluid communication with one of:
• the oil conduit, the fluid passage flowing at least part of the oil flow through the fluid passage when the aircraft engine is in use, the fluid passage of the second heat exchanger located upstream of the oil passage of the first heat exchanger relative to the oil flow, and
• the fuel conduit, the fluid passage flowing at least part of the fuel flow through the fluid passage when the aircraft engine is in use.