Eclipse Combustion AIRHEAT AH-MA - Manual (Page 16)

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05 16
Profile plate sizing
Profile plates are required to ensure sufficient air pressure drop across
the burner. An example of profile plate layout is shown in Figure 3.4 on
the next page.
Caution:
It is essential that even air flow is delivered to the
burner to obtain optimum performance.
To calculate the profile gap sizes, you will need to know the following:
1) SCFM
= Total air flow around and through the burner in cubic feet
per minute.
2) Design pressure drop across the burner.
3) G
p
= Profile gap area required per flow from Figure 3.3; see Table 3.4
for corrections at higher or lower burner air inlet temperatures.
Profile area, A
g =
SCFM x G p
1000
Where:
A
g
= Area in square inches of the gap between the profile plates and
the burner.
The areas on the sides of the burners should first be calculated based
on a fixed gap of 2". Then calculate the gap size required on the top
and bottom to obtain the required profile gap area.
Example: Size a profile plate for a seven-foot long AH-MA v2.00
burner. Air flow around and through the burner will be 60,000 SCFM.
The design pressure drop is 0.7"w.c.
Note:
Use a burner wing width of 8.9” for profile gap sizing on top and
bottom.
From Figure 3.3: G
p
= 48
A
g
= 60,000 x 48 = 2,880 sq. in.
1,000
Calculate gap sizes:
Side Area = 2 x 2" x 8.9" = 36 sq. in.
Area Top & Bottom = 2,880 – 36 = 2,844 sq. in.
Therefore, Top & Bottom Gap = 2,844 sq. in. = 16.9 inches
(7 x 12) x 2 gaps
where 7 x 12 = burner length in inches