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BPP1-Visitor
1-Visitor
April 11, 2020
Solved

Temperature units

  • April 11, 2020
  • 5 replies
  • 2110 views

Hi everyone.

I am doing a simple calculation, but I have problems in the temperature units, which generates erroneous results.

 

Example.JPG

 

A quick solution in this case would be to work the temperature without units. However, is there a way to work with units in this type of equations without getting wrong results?

Thanks for the help

Best answer by StuartBruff

Here's a confirmatory worksheet ...

 

 

StuartWorking with Temperatures.png

5 replies

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StuartBruff23-Emerald V
23-Emerald V
April 11, 2020
I haven't got Mathcad available at the moment to check, but Mathcad internally stores temperatures as kelvin. Consequently, your T2+Tperd will be about 338 K + 278 K = 616 K, giving deltaT = 333 K (which is about 60 deg C).

You need to take this into account. There is a ways of dealing with this in unit, but I can't remember what it is ... look it up in help?

Stuart
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StuartBruff23-Emerald V
23-Emerald V
April 11, 2020
Yes, you have to use the delta C unit to represent temperature differences.

https://support.ptc.com/help/mathcad/r6.0/en/index.html#page/PTC_Mathcad_Help%2Fexample_working_with_temperatures.html%23wwID0EK5ZDB
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StuartBruff23-Emerald VAnswer
23-Emerald V
April 11, 2020

Here's a confirmatory worksheet ...

 

 

StuartWorking with Temperatures.png

    B
    BPP1-VisitorAuthor
    1-Visitor
    April 11, 2020

    Great. Thank you very much Stuart.

    V
    ValeryOchkov24-Ruby IV
    24-Ruby IV
    April 12, 2020

    TT.png

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