ALTERNATIVE-FUEL GAS ORIFICE HAVING PRINCIPAL-FUEL GAS ORIFICE TEMPERATURE PROFILE AND A HEATING, VENTILATION AND AIR CONDITIONING SYSTEM INCORPORATING THE SAME

摘要

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.

主权项

1. A method of designing a gas orifice, comprising:
determining a temperature profile 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 said principal fuel; determining a cross-sectional area of a metering neck for an alternative-fuel gas orifice assuming a standard delivery pressure for said alternative fuel; determining a cross-sectional area and a length of a diffuser based on said temperature profile that results from said alternative fuel delivered to said orifice at a standard delivery pressure for said alternative fuel; and manufacturing at least one alternative-fuel gas orifice having a metering neck of said desired cross-sectional area and diffuser of said desired cross-sectional area and length.