Eclipse Combustion AIRHEAT AH-MA - Manual (Page 11)

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05 11
2) From the “Operating Range” chart in Data Sheet No. 160, the maximum
heat input at 0.7"w.c. air pressure drop is 800,000 Btu/hr/ft. The flame
length from the “Flame Length” chart in Data Sheet No. 160 is 30".
Burner length, feet = 6,240,000 Btu/hr = 7.8 feet; round up to 8 feet.
800,000 Btu/hr/ft
3) Minimum: Btu/hr = 1.3 X 60,000 X 5 = 390,000 Btu/hr.
4) Minimum per foot = 390,000 Btu/hr = 48,750 Btu/hr/ft.
8 ft.
5) From the “Operating Range” chart in Data Sheet No. 160, the
minimum input at 0.7” w.c. is 20,000 Btu/hr/ft. Therefore, the
burner can operate over the desired input range.
Layout of the burner sections
Once the lineal feet of burner has been determined, use Figure 3.2
and the criteria below to define the burner geometry.
For optimum burner performance and a uniform temperature profile,
even gas and air flow throughout the burner is essential. The following
guidelines should be used to lay out a burner:
1) Every leg of a Tee or Cross section must be separated from another
Tee or Cross section by at least 150mm (6") of burner.
2) Include the proper number of gas feed inlet sections. Use Table 3.1
as a guide to the number and size of gas feed inlets required based
on the length of the burner.
Table 3.1 Gas Feed Inlet Capacities
Example: A six-foot burner for standard gas pressure will use 2"
N.P.T. rear inlets to supply gas. How many gas inlets are required?
Solution: Each 2" back inlet can supply 4 feet of burner.
Therefore, = 1.5, or 2 inlets are required
3) Space gas inlets equally to assure uniform gas distribution.
6/4
1-1/2"
1-1/2"
2"
2"
2"
1"
1-1/2"
1-1/2"
2"
2"
2"
Rear
Side
Rear
Rear
Side
Side
Rear
Side
Rear
Rear
Side
300mm straight section, Cast Iron
300mm straight section
300mm straight section, Aluminum
300mm x 300mm cross section
300mm straight section
300mm straight section
300mm straight section, Cast Iron
300mm straight section
300mm straight section, Aluminum
300mm x 300mm cross section
300mm straight section standard
standard
standard
standard
standard
Low
Low
Low
Low
Low
Low
4
3
4
6
4
.5
2
1.5
2
6
2
Gas Inlet
Pipe Size Directon Section Type
Gas
Pressure
Max. Burner
Length Per
Inlet*
* Number of feet or 300mm sections
1" Side 300mm straight section standard 1