A combustion air pre-heat system increases overall system efficiency and can significantly reduce operating costs by minimizing fuel consuption. Heater exhaust gasses are utilized to pre-heat the incoming combustion air. This improves utilization of the fuel consumed by the heater, which results in lower operating costs. The estimated overall efficiency when using this system can exceed 93% (LHV basis). A typical combustion air pre-heat system consists of the following items:

Air to air heat exchanger

Modified burner to accommodate elevated combustion air temperatures

Combustion air ductwork from combustion fan to heat exchanger and from heat exchanger to heater.

Exhaust gas ductwork from heater to heat exchanger, and from heat exchanger to stack