Alternative-fuel gas orifice having principal-fuel gas orifice temperature profile and a heating, ventilation and air conditioning system incorporating the same

Patent metadata

Field	Value
Publication number	US-9541303-B2
Application number	US-83465810-A
Country	US
Kind code	B2
Filing date	Jul 12, 2010
Priority date	Jan 15, 2010
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

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: (1 a ) 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 (1 b ) 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.

First claim

What is claimed is:

1. A gas furnace, comprising:
a housing;
a solenoid valve located in said housing;
a manifold coupled to said solenoid valve;
at least one alternative-fuel gas orifice coupled to said manifold, said at least one alternative-fuel gas orifice having a body having a first portion, a second portion adjacent said first portion, an aperture extending therethrough, wherein said first portion comprises a beveled end and threads, and said second portion comprises a head configured for turning said body, said body including:
a metering neck having an entry diameter D 1 and a cross-sectional area such that a given flow rate of an alternative-fuel gas is established when said alternative-fuel gas is delivered to said alternative-fuel gas orifice at a given alternative-fuel delivery pressure;
a diffuser having a cross-sectional area larger than said cross-sectional area of said metering neck and a length such that said alternative-fuel gas achieves a substantially laminar flow before exiting said diffuser through an exit aperture having diameter D 2 , wherein a ratio D 2 /D 1 is greater than 1.0 and D 2 is within said second portion;
wherein a diameter of said diffuser is between 1.1 and 1.7 times a diameter of said metering neck;
at least one corresponding heat exchanger configured for operation with a principal-fuel gas temperature profile located proximate said at least one alternative-fuel gas orifice, wherein a cross-sectional area of the diffuser causes the alternative-fuel gas to burn in the at least one heat exchanger with a resultant temperature profile that is the same as the principal-fuel gas temperature profile in the heat exchanger at a standard principal-fuel delivery pressure; and
a blower located in said housing proximate said at least one heat exchanger.

2. The gas furnace as recited in claim 1 , further comprising a draft inducing exhaust fan associated with said at least one heat exchanger.

3. The gas furnace as recited in claim 1 , wherein said metering neck has a circular cross-section.

4. The gas furnace as recited in claim 1 , wherein said diffuser has a circular cross section.

5. The gas furnace as recited in claim 1 , wherein said length is between 3 and 7 times a diameter of said diffuser.

6. The gas furnace as recited in claim 1 , wherein a diameter of said metering neck is between 0.02 inches and 0.05 inches and said length is about 5 times a diameter of said diffuser.

Assignees

• Paller Hans J
• Kowald Glenn W
• Lennox Ind Inc

Inventors

• Paller Hans J
• Kowald Glenn W

Classifications

• F24H3/087 Primary

  using fluid fuel · CPC title

• B29L2031/18

  Heat-exchangers or parts thereof · CPC title

• F23D14/34

  Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air · CPC title

• F23D14/58

  characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration · CPC title

• B23P15/00 Primary

  Making specific metal objects by operations not covered by a single other subclass or a group in this subclass · CPC title