9
Eclipse RatioAir v1 Design Guide No. 115, 11/12/2008
Step 1 describes how to select burner options to suit an
application. Use the RatioAir Price List 115 and Datasheets,
Series 115 when following this selection process.
Caution:
Consult EFE-825 Eclipse Engineering Guide, or contact
Eclipse if you have special conditions or questions.
Burner Model / Size Selection
Consider the following when selecting the burner size:
Heat Input:
•
Calculate the required heat input to achieve
the required heat balance.
Power Supply Frequency:
•
Burner capacity will vary with
power supply frequency (60Hz power).
Combustion Chamber Pressure:
•
Consider the effects
that large or varying chamber pressures have on burner
performance.
Altitude:
•
The maximum burner capacity is reduced by
approximately 3% each 1000 feet (300 meters) above sea
level.
Combustion Air Supply:
•
Combustion air should be fresh
(20.9% O
2
) and clean (without corrosives).
Combustion Air Temperature:
•
Changes in air supply
temperature can affect the burner capacity. The
combustion air supply temperature should not exceed
250°F.
Fuel Type:
•
Variation in calorific value and density will
affect burner performance.
Fuel Type
Fuel
Symbol
Gross Heating Value
Specific Gravity
Natural Gas CH
4
90%+ 1000 BTU/ft
3
(40 MJ/m
3
)
0.60
Propane
C
3
H
8
2570 BTU/ft
3
(103 MJ/m
3
)
1.52
Butane
C
4
H
10
3250 BTU/ft
3
(130 MJ/m
3
)
1.95
BTU/ft
3
@ standard conditions (MJ/m
3
@ normal conditions)
If using and alternative fuel supply, contact Eclipse with an accurate
breakdown of the fuel components.
Air Supply
When a standard RatioAir Version 1.0 burner is ordered, a
combustion air blower is supplied and mounted directly to the burner
body.
Combustor Type
Select a combustor type based on the application. Low temperature
applications use an alloy combustion tube. High temperature
applications use a silicon carbide (SiC) tube or a refractory block &
holder. For vertical down-firing applications with block and holder,
consult factory.
Step 1:
Burner Option
Selection
