EDA, Incorporated

Fan, Blower and HVAC Calculations

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Fan, Blower, and HVAC Applications

References

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The following links have been reviewed and approved to be the best engineering information available on the internet, so please enjoy and if you have a better link of engineering information, email it to SiteManager@edasolutions.com .

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On-Line Fan Calculations and Properties

Use basic Fan Laws to calculate the capacity, pressure, and horsepower of equipment running at different speeds. Determine the density of air depending on barometric pressure and temperature. Calculate the velocity pressure of your fans, and the round duct equivalent of a rectangular duct.

Use of this program is very simple. Just input the conditions about the application you are considering and click the appropriate "Calculate" button.

After the results are shown you can then use the "copy and paste" functions on your browser to transfer this information to other applications.

Technical References and Assumptions

This program is designed to calculate the various properties of fans and blowers

The basic calculations on which these results are based can be found in many publications. One excellent one is:

Engineering Guide Published by Chicago Blower Corporation

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On-Line Duct Friction Loss and Velocity Pressure Calculation

Calculate the Duct Friction Loss for any sized round of rectangular duct. The program accommodates any gas or vapor, thus it can be used for industrial applications handling like scrubbers as well as traditional commercial HVAC applications. As well as friction loss, this program also calculates the Velocity Pressure in the duct.

How to Use the Duct Friction Loss Program

Use of this program is very simple. Just input the information about the flow application you are considering and click the "Calculate Duct Loss and Velocity Pressure" button at the end of he form. A window will then come up showing you all the results. To change an input simple hit your browser's "Back" button, change the data as needed, and click the "Calculate Duct Loss and Velocity Pressure" button again.

After the results are shown you can then use the "copy and paste" functions on your browser to transfer this information to other applications.

If your are you are considering a compressible fluid system that is usually contained in pipes instead of ducts, has pressure drops measured in PSI instead of inches of Water, operates at pressures significantly higher or lower that atmospheric, or needs to consider the compressibility factor of the gas, then you should not use this program. Instead use On-Line Gas Friction Loss for any Pipe Size or On-line Compressible Flow Pressure Loss, both found on this site.

Technical References and Assumptions

This program is designed to allow rigorous calculation of compressible fluid pressure drops in ducting usually found in HVAC and other low pressure systems like scrubbers. This program can be used for any gas or vapor system, and is not restricted to just air systems. As long as the properties of the gas in question are entered into the form, the duct drop calculation should be valid. The major assumption is that the flow in the pipe or tubing being analyzed can be considered to the adiabatic. It is also assumed that the gas obeys the perfect gas law and that it is flowing through a constant-area pipe. If your are you are considering a compressible fluid system that is usually contained in pipes instead of ducts, has pressure drops measured in PSI instead of inches of Water, operates at pressures significantly higher or lower that atmospheric, or needs to consider the compressibility factor of the gas, then you should not use this program. Instead use On-Line Gas Friction Loss for any Pipe Size or On-line Compressible Flow Pressure Loss, both found on this site.

Analysis of pressure drop in straight duct sections based on Flow of fluids through valves, fittings, and pipe, Technical Paper No. 410, 1985, Crane Co. and the theoretical evaluation of adiabatic flow of an ideal gas (outlined in "The Dynamics and Thermodynamics of Compressible Fluid Flow" A.H. Shapiro, The Ronald Press Company, 1953, Chapter 6).

The method of use of velocity pressure to determine the pressure drop in all other components (ie. elbows, duct entry losses, duct exit losses), as well as the loss factors for these components is derived from "Industrial Ventilation, A Manual of Recommended Practice," American Conference of Governmental Industrial Hygienists, 22nd Ed., 1995.

Read about this application in Chemical Online

 

 

Fan and Blower Data Sheet

Use the above data sheet to specify fans or blowers for industrial or commercial applications and submit this information electronically to vendors for quotation.

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Company Profile

EDA, Incorporated provides quality-engineering services on time, on schedule and within budget.  EDA, Inc. is able to do this by performing the work correctly the first time. We accept the most challenging problems and look forward to working with the client as a team member.  EDA believes that the client should be an active participant in the work process to ensure that the product is commensurate with client expectations and is delivered within schedule and budget constraints.

EDA, Inc. belongs to the American Society of Mechanical Engineers (ASME), the National Society of Professional Engineers (NSPE), the Society of Instrument Control Engineers, Society of Professional Engineers (ISA) and the American Nuclear Society (ANS).


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For more information on EDA, Incorporated services, please contact Client Service Manager at:

Client Service Manager

EDA, Inc.

6397 True Lane

Springfield, VA 22150

 

or email  the Client Service Manager at SiteManager@edasolutions.com .

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Contact Information

Telephone
Virginia Office (703) 313-9138
Postal address
6397 True Lane
          Springfield, Va 22150
Electronic mail
General Information:  Site Manager@i-edainc.com