Looking for recommendations of a Neher-McGrath software package

[Paul the BIG Finn]

We have a complicated service for a data center which is being supplied from three 2.5 kVA transformers. Each transformer is loaded to 2/3s of the ultimate building load. if any single service fails and its associated generator fails to start the load will be picked up from the surviving services and generators.

Given the relatively tight spacing of the duct banks we want to model the heat gains and are looking for a software package.

Any suggestions will be appreciated.

 

[Ingenieur]

I assume you mean 2.5 mva
might be easier to just calc the iR losses and see if it is a concern
are you talking about buried concrete encased duct banks?
the earth is a good heat-sink
if installed per code it should be within an acceptable operating range

http://neher-mcgrath.com/Heating_Calculations.pdf
they reference sw at the end

There are several software packages available that will calculate the Neher-McGrath equations. Each of these packages has its pros and cons. Please feel free to email us with your particular project requirements and we can help you find the software package that best suits your needs. Email Us

 

[charlie b]

If you want to calculate the ampacity of cables in underground ducts, or wish instead to find the temperature within the ductbank, the software I have used is AmpCalc. I found it to be simple to use, and not as expensive as other software packages that can do that job and many others (such as SKM).
http://www.calcware.com/

 

[Ingenieur]

If you want to calculate the ampacity of cables in underground ducts, or wish instead to find the temperature within the ductbank, the software I have used is AmpCalc. I found it to be simple to use, and not as expensive as other software packages that can do that job and many others (such as SKM).
http://www.calcware.com/

that's the one they used in the white paper

 

[ron]

We use Ampcalc as well.

Be sure to consider mutual heating from adjacent ductbanks if they are close enough. So if a separate ductbank is run within a few feet of another, you still may get heat effects to the one you are thinking about.

 

[Paul the BIG Finn]

Thanks for the suggestions and yes they are 2.5 MVA.

 

[W6SJK]

If you want to calculate the ampacity of cables in underground ducts, or wish instead to find the temperature within the ductbank, the software I have used is AmpCalc. I found it to be simple to use, and not as expensive as other software packages that can do that job and many others (such as SKM).
http://www.calcware.com/

Ditto on AmpCalc

 

[Phil Corso]

Paul the BIG Finn


If you're interested, I have a manual calc I did in the slide-rule era!

Regards, Phil Corso

 

[MyCleveland]

Phil Corso

I would like to see your hand calc method.
Another spreadsheet in the making.

 

[Phil Corso]

No! Just math! I did it with a slide-rule, you can certainly do it with a Hand-held calculator!

Phi;

 

[MyCleveland]

No! Just math! I did it with a slide-rule, you can certainly do it with a Hand-held calculator!

Phi;

What I meant was you show me the math....formulas, variables, etc. and I will put it into a spreadsheet.

 

[Phil Corso]

My Cleveland,
Contact me via "Private Messages" or at Cepsicon@aol.com
Phil