Required Data: this data is required to make a preliminary selection.

HP PPH BTUH Enter Boiler Capacity: Required Data
You may enter your boiler capacity in Boiler Horse Power (HP), Boiler Pounds per Hour (PPH) capacity, or BTU input per hour (BTUH). Firetube boilers are typically rated in HP while watertube boilers are rated in PPH. Smaller commercial boilers rated in BTU input require the input to be entered in million BTU per hour, for example a 1,500,000 btu/hr unit should be entered as 1.5 in the data entry area.
Economizer Inlet Water Temperature F: Required Data
Water inlet temperatures under 215 F will be considered non-deaerated - stainless steel tube required and will be included. Note if the economizer is to be used for a process water (non-boiler feedwater) application you will have the opportunity to enter a custom water flow rate lower on this page.

Economizer Flue Gas Inlet Temperature F At High Fire: Required Data
If you're not sure:
Firetube: If unknown assume 75 degrees above saturated steam temperature
Watertube: If unknown assume 150 degrees above saturated steam temperature
Click here for steam tables to see saturated steam temperatures
Optional Part-Load Gas Temperature Inputs Available Below in Optional Input Section.

Boiler Manufacturer Economizer Will Be Installed On: Required Input
Select Manufacturer or Type --- Firetubes (Scotch Marine) --- Superior Apache Superior Aztec Superior Mohawk Superior Mohican Superior Seminole Superior Super Seminole Superior (other)
We recommend you enter the manufacturer of the boiler if known as some boilers, primarily firetube boilers, have a lower tolerance for flue gas backpressure. Not selecting any specific manufacturer will result in the use of default data for the boiler type selected.

All performance based on counter-flow piping arrangement only.

Project Specific Input: Entered on a project-by-project basis.
Unit Recovery Type - BASE, MIDRANGE, SUPER, ECONOMY, INDUSTRIAL: Project Specific
ECONOMY - Economy Coiled Unit - Typically under 300 HP Only
BASE - Base Unit - Lowest Capital Cost Standard Economizer
MIDRANGE - Mid-Size Unit Designed to fit into the nitche between a BASE and a SUPER
SUPER - High Recovery Unit - Higher Capital Cost Standard Economizer
INDUSTRIAL - Very Large Boiler Economizer
BYPASS ECONOMY: Select to disable automatic small boiler ECONOMY selection while leaving AutoPick activated. Allows user the ability to check performance and pricing on BASE and SUPER units on smaller boilers.

This provides the user an opportunity to select a unit configuration based on desired recovery and initial capital cost. If unsure leave default alone and the software will select the unit.

Existing Boiler Efficiency: Project Specific Input
You can change the efficiency of the existing boiler system. The default is 81%. The fuel mass flow rate calculations are based on this number so should not only be changed with care and knowledge.
Select Current Boiler Efficiency: 0.81 0.80 0.79 0.78 0.77 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.65 0.82 0.83 0.835 0.84 0.845

Boiler Stack Diameter: Project Specific Input
If you have entered a specific boiler model above the software will check the database to find the typical stack size for the given boiler. If you wish to override this number of enter a specific size for a unit not in out database you may enter it below. Leave at 0 for automatic select to work.
Select Boiler Flue Gas Diameter: 0 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48

Enter Fuel Price ($/mbtu): 10.00 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 Project Specific Input
Select the price of natural gas in dollars per million btu's.

Enter Annual hours of Operation: Project Specific Input
These hours will be reflected in each of the four load performance runs. There are a total of 8,760 hours in one year

Annual Hours at at Load Condition 1 - 100% Firing Rate: hours
Annual Hours at Load Condition 2: hours
Annual Hours at Load Condition 3: hours
Annual Hours at Load Condition 4: hours

Part-Load Firing Rate Selection: Project Specific Input
This is for changing the part-load firing rates. The default values are provided in the cells. The values cannot exceed 100 or be below 1.

Load Condition 1 Firing Rate: 100% Firing
Load Condition 2 Firing Rate: % Firing
Load Condition 3 Firing Rate: % Firing
Load Condition 4 Firing Rate: % Firing

Part-Load Flue Gas Temperature Input: Project Specific Input
The AutoPick software will automatically reduce flue gas temperature for typical applications. If you wish to enter specific flue gas temperatures at part-load firing rates you may do so below. NOTE ! If you do not want to enter other gas temperatures then leave these cells blank !

Gas Temperature at Load Condition 1 - 100% Firing: Entered Above in REQUIRED section
Gas Temperature at Load Condition 2: deg F
Gas Temperature at Load Condition 3: deg F
Gas Temperature at Load Condition 4: deg F

Burner Flue Gas Recirculation Rate: Project Specific Input
Enter the FGR rate only if your burner utilizes FGR and only if the FGR connection to the burner is downstream of the economizer. If your burner does not use any FGR then leave this cell blank. Typical Low NOx burners run 5% to 15%. Standard burners have no FGR so leave cell blank.

FGR Take-off Before or After Economizer: Project Specific Input
After Economizer
Before Economizer
You may select if the flue gas recirculation is taken through the economizer or extracted prior to the economizer. Extracting it after the economizer provides cooler flue gas to the burner however also means the economizer is physically larger and more expensive to accommodate the additional volume. There are advantages and disadvantages to both, consult your burner technician for support. The default is extraction prior to the economizer to allow for a lower capital cost.

Unit Fin Count: Project Specific Input
5 Fins per Inch - Gas Firing With Standby #2 Oil
4 Fins per Inch - Gas and Consistent #2 Oil Firing
3 Fins per Inch - Fuel Oil Firing
6 Fins per Inch - Consult us prior to selection
You may select 5 fins per inch if your plant fires gas with a #2 oil for standby use of less than one week annually. 4 fins for constant #2 oil firing, and 3 fins for heavy oil, #6, or other dirty fuels. If unsure leave at 5 fins.

Enter Blowdown Rate (%): 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Project Specific Input
This is the percent continuous (surface) blowdown. Enter if known.

Optional Input Section
PPH GPM % Make-Up Custom Water Flow Rate (lbs/hr): Optional Input
Enter the water flow rate ONLY if the flow rate will differ from the boiler capacity flow rate. This feature is for economizers used in a non-traditional installation such as process water heating. If your application is a typical boiler economizer arrangement then leave this cell blank and leave units on PPH!

• PPH - Enter an exact value in pounds per hour (PPH) non-deaerated water flow through the economizer
• GPM - Enter an exact value in gallons per minute (GPM) non-deaerated water flow through the economizer
• % of Make-Up - enter as a percentage number between 25 and 100 when using cold non-deaerated water prior to delivery to feedwater tank. Not valid for deaerated water flow to boiler.

Two-Stage Economizers: Optional Input
Check to Select Two-Stage Economizer Unit
Enter Second Stage Water Inlet Temperature
PPH GPM % Make-Up Enter Second Stage Water Flow
Second Stage maximum Water Side Pressure Drop: 15 20 5 10 PSI
This option allows for a second coil for heating two separate water flows, a primary and a secondary circuit. This input is considered the secondary circuit. If the second stage water flow is to match the first stage leave the flow rate field blank. Note this secondary circuit does not feature the same automatic resizing subroutine for excessive water side pressure drop feature as the primary circuit. An excessive water side pressure drop on the secondary circuit will result in an automatic reduction in allowable water flow rate to meet the maximum water pressure drop.

BEI "Condense-O-Mizer" Dedicated Condensing Economizer: Optional Input
This overrides the selection criteria allowing for a true external condensing economizer application. The controls and fan are included in the preliminary proposal up to a certain size. Performance hint: to really get great performance out of these units take a look at using the Stack Economizers option.
Select Condense-O-Mizer dedicated condensing Unit

Stacked Economizers: Optional Input
Stack Units
Do Not Stack Units
Stacking economizers is a way of increasing heat recovery by placing two identical units on top of each other. The price will be double the price of the individual units. Stacking is to be utilized when very high heat recovery is required. Stacked units will also be much wider than a single unit as each unit will only be able to accommodate half of the allowable gas side pressure drop as a single unit would be allowed.

Target Flue Gas Outlet Temperature: Optional Input
Enter Target Gas Exit Temperature deg F
Stay with Model Selected
Increase Model Size
If you need a unit to meet a specific flue gas exit temperature enter the value in the above data field and the software will manipulate various designs to come as close as possible. The radio buttons allow the software to decide whether to stay with the model selected or increase model size in the event achieving the target gas temperature is not possible with the given model size selected. Selecting Increase Unit Size may not select the most cost effective unit so we recommend you do not change the radio button unless you consider changing model types as well to obtain the optimum unit selection.

Tube Material Override: Optional Input
Override ON
Override OFF
By default units with deaerated water will be supplied with carbon steel tubes, all other applications and all ECONOMY units have stainless steel tubes. Should you wish to override the carbon steel tube selection for deaerated applications and utilize a stainless steel tube click the button above. We do not permit the use of carbon steel tubes in any non-deaerated process.