Patent ID: 6019069
Filing Date: 2000-02-01
Classification: F23C,F23D,F23M,F24H,Y02B

Abstract:
A gas-fired heater for providing substantially convective heat transfer, said heater including a housing having a burner apparatus mounted therein, said burner apparatus including air/fuel supply means for receiving a flow of gaseous fuel from a source thereof and operating in response to the flow of fuel to aspirate and combine a primary combustion air component therewith to form a combustible air/fuel mixture for delivery to a burner unit, said air component being greater than from about 110% to about 200% of that required for theoretically complete combustion, said burner unit including a porous combustion surface, a combustion chamber containing said combustion surface, said combustion chamber being substantially sealed to prevent the entrance of secondary air and including a discharge opening for products of combustion, said discharge opening being in fluid communication with the environment and being arranged to produce a subatmospheric pressure in said combustion chamber in response to the flow of the products of combustion into the environment, said subatmosphric pressure causing said air/fuel mixture to flow through said combustion surface at a rate which exceeds the flow rate that would exist if the combustion chamber was at atmospheric pressure, said housing including an air inlet and an air outlet for respectively taking in circulating air from a space to be temperature conditioned and for discharging the heated circulating air together with the products of combustion into the space to be temperature conditioned, said burner apparatus having said combustion chamber discharge opening in communication with said air outlet.