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mdewolff-21-Visitor
1-Visitor
June 9, 2018
Question

get equations right in Prime 3.0

  • June 9, 2018
  • 2 replies
  • 2189 views

Hello,

 

Mathcad is giving me error messages that units used are not compatible although I've declared the variables I'm using. What do I do wrong?

 

Thanks, maurits

2 replies

W
Werner_E25-Diamond I
25-Diamond I
June 9, 2018

Just listen to what Prime is telling you!

If Prime says that the units are not compatible, thats usually true and you should check either the units assigned to your variables or your equations (or both).

Obviously you can't add or subtract quantities of different dimensions.

You try to subtract J and J/kg. This can't work.

So check your units, check your formula!

B.png

 

For further question please don't send just pictures or pdfs - attach your worksheet!

    M
    mdewolff-21-VisitorAuthor
    1-Visitor
    June 9, 2018

    Thanks for yelling at me.

    F
    Fred_Kohlhepp23-Emerald I
    23-Emerald I
    June 9, 2018

    cp is J/kg K

     

    h.kerosine is J

     

    cp * T is J/kg

     

    h - cp*T does not balance

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