 Rank: Newbie
Groups: Registered
Joined: 12/07/2011(UTC)
Posts: 1
Location: Arizona, USA
|
 consider following entry: 715*'BTU/'hr*'ft^2*'degF = where degF stands for the deg symbol and F as found in the units popup. All the units are blue and 715 and = sign are black. This is a perfectly good constant (heat flow) which I wanted to convert to SI units; however, no matter what I do I get a units mismatch error. I check out each unit individually and found them to be correct. 0.89 build 3856---- you can not have a units mismatch in a constant no matter what units you choose - a constant is a defined entity (could be laundry#/raisins). I think it is a bug but I am not sure. I leave it to you.  Regards, jd p.s. This is a nicely done program; however, it needs better advertisement to increase the user base and the dollars
|
|
|
|
|
|
  Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740   Was thanked: 318 time(s) in 268 post(s)
|
Hello, It is a known issue regarding relative and absolute temperature scales. You should not use relative temperature scales in the expression like these. Please look at the posts under Temperature scalesHere is an example as well in order to clarify a bit: Open in SMath CloudAs you could see, if you use the relative temperatures unit in the expression (Fahrenheit) SMath will get confused. The solution is to define new temperature units using the absolute temperature scales (Rankine. Kelvin) I hope it makes the things more clear now. Regards, Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
|
|
|
|
|
  Rank: Advanced Member Groups: Registered
Joined: 09/01/2010(UTC) Posts: 102  Location: Oregon, USA Was thanked: 5 time(s) in 5 post(s)
|
Just to add to what Radovan is saying, please take a look at the Examples page on the wiki, see the last entry under the Engineering section called Engine Heat Rejection Calcs. This is another example of how to perform calculations using relative temperature scales in Smath. Here is a direct link as well: Heat Rejection CalcsSincerely, Will Edited by user 14 July 2011 23:01:46(UTC)
| Reason: Not specified |
Will Massie
Mechanical Engineer
Oregon, USA |
 1 user thanked maweilian for this useful post.
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
