Alternative-fuel gas orifice having principal-fuel gas orifice temperature profile and a heating, ventilation and air conditioning system incorporating the same
AssigneeLennox Industries Inc.
InventorsHans J. Paller, Glenn W. Kowald
Life of this patent
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Abstract
An alternative-fuel gas orifice, a gas furnace configured to employ the same and a method of designing a gas orifice. In one embodiment, the gas orifice includes: (1) a body having an aperture extending therethrough and including: (1a) a metering neck having a cross-sectional area such that a given flow rate of a gas is established when the gas is delivered to the gas orifice at a given alternative-fuel delivery pressure and (1b) a diffuser having a cross-sectional area larger than the cross-sectional area of the metering neck and a length such that the gas achieves a substantially laminar flow before exiting the diffuser.
Claims5
A method of designing a gas orifice, comprising:
- determining a temperature profile in a heat exchanger assuming a principal fuel delivered to a principal-fuel gas orifice having a metering neck of a desired cross sectional area at a standard delivery pressure for the principal fuel;
- determining a first desired cross-sectional area of a metering neck for an alternative-fuel gas orifice assuming a standard delivery pressure for an alternative fuel;
- determining a second desired cross-sectional area and a length of a diffuser based on the temperature profile in the heat exchanger that results from the alternative fuel delivered to the alternative-fuel gas orifice at a standard delivery pressure for the alternative fuel;
- manufacturing the alternative-fuel gas orifice having a metering neck of the first desired cross-sectional area and a diffuser of the second desired cross-sectional area and length;
- and
- wherein a diameter of the diffuser is between 1.1 and 1.7 times a diameter of the metering neck of the alternative-fuel gas orifice.
Dependencies are inferred from the claim text.