Heat exchanger state sensing apparatus and method of use thereof

A method for sensing state, comprising the steps of:

• providing a heat exchanger, said heat exchanger comprising a set of heat exchange pipes at least partially inserted into a housing of said heat exchanger;
• providing a heat exchange state model;
• detecting first signals passing through a first portion of said heat exchanger with a first ultrasonic sensor;
• detecting second signals passing through a second portion of said heat exchanger with a second ultrasonic sensor;
• and
• at least one of the steps of:
• training said heat exchange state model with said first signals and said second signals;
• receiving output from said heat exchange state model, said heat exchanger state model previously trained with said first signals and said second signals;
• mounting said first ultrasonic sensor in contact with a first pipe of said set of heat exchange pipes;
• and
• mounting said second ultrasonic sensor in contact with a second pipe of said set of heat exchange pipes.