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US 2014/0209086 A1Published application
Direct fired heaters including premix burner technology
AssigneeCambridge Engineering, Inc.
InventorsGary J. Potter, SR., John P. Foley, JR., Thomas J. Cleary, Marc D. Braun, Carl Schoenberg, John H. Kramer, JR.
Life of this patent
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Abstract
According to various aspects, exemplary embodiments are disclosed of direct fired heaters including premix burner technology and/or feed forward control loop modulation via inlet air temperature.
Claims32
A direct fired heater comprising:
- one or more premix burners;
- one or more premix combustion air blowers operable for delivering a combustible mixture of air and gas to the one or more premix burners;
- an outside ventilation air delivery system upstream of the one or more premix burners;
- an ignition system;
- a modulation system operable for modulating heat output based on discharge air temperature, inlet air temperature, or a temperature of a space being heated by the direct fired heater;
- a high limit control;
- and
- a single controller operable for controlling the ignition system, the modulation system, and the high limit control;
- wherein the outside ventilation air delivery system comprises an outside air blower upstream of the one or more premix burners and operable for processing a combination of inside and outside air;
- and/or
- wherein the direct fired heater is configured to use 100% outside air.
8 more elements
A packaged HVAC system comprising a blower and a direct fired heater, the direct fired heater comprising:
- an outlet arranged to feed an inlet or suction side of the packaged HVAC system blower;
- one or more premix burners;
- one or more premix combustion air blowers operable for delivering a combustible mixture of air and gas to the one or more premix burners;
- and
- an outside ventilation air delivery system upstream of the one or more premix burners.
2 more elements
A direct fired heater comprising:
- one or more premix burners;
- a gas valve assembly;
- one or more premix combustion air blowers operable for delivering a combustible mixture of air and gas to the one or more premix burners, the one or more premix combustion air blowers and the gas valve assembly are in a separate compartment from a fresh air blower of the direct fired heater;
- an outside ventilation air delivery system upstream of the one or more premix burners;
- a feed forward modulating control system operable for controlling heat output such that heat output modulation is based on inlet air temperature;
- an electric heater operable for warming the separate compartment having the one or more premix combustion air blowers therein;
- and
- a fire tube having a channel that creates a pathway to a gas valve/combustion air blower compartment, whereby during operation, a portion of the outside ventilation air is pushed through the channel in a counter flow direction compared to a main air flow, absorbs heat from a fire tube surface, and carries the heat to the gas valve/combustion air blower compartment to thereby provide supplementary heat.
5 more elements
Dependencies are inferred from the claim text.