  Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433   Location: USA Was thanked: 17 time(s) in 15 post(s)
|
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 03/02/2014(UTC) Posts: 67  Was thanked: 13 time(s) in 11 post(s)
|
What exactly do you want to do?
|
|
|
|
|
|
 Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866  Was thanked: 981 time(s) in 809 post(s)
|
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
Sorry. I'm looking to have SMath do the algebraic manipulation ...
|
|
|
|
|
|
Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
|
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
|
|
|
|
|
|
Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
|
Originally Posted by: ElSid  Different approach Attach *.sm ... instead. 
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
Jean, Originally Posted by: ElSid This is Rev "C" so it's a NEW file With that said, I am attaching Rev "D". I cannot figure out the error. Value is now coming in correctly. Attached is a screen shot of a "scratch" file I created with just the variables  Tank Wall Temperature Insulation(D).sm (201kb) downloaded 14 time(s). Edited by user 21 March 2018 16:00:06(UTC)
| Reason: NEW File and screenshot
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
Not sure what I did, but FindRoot seems to have worked ... Sanity check Rev E? Tank Wall Temperature Insulation(E).smz (103kb) downloaded 12 time(s).Next is to add a plot --> Ins. thickness vs. T1
|
|
|
|
|
|
Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
|
Originally Posted by: ElSid Not sure what I did, There is a closely related example in Mathcad, just a bit [a big bit] more involved. My expertise on that is about a thermostated tank, once insulated from some of the reference you mentioned, and local standards vary. *.smz = 103 kB ... *.sm = 102 kB
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
Graphing problem with units not cancelling out. Go to bottom of page. Essentially, all values are calculated with Kelvin. I change the units in the array to F and we are OK. I then try and divide by F, and I get K over F. So I cannot plot ... Also, my program updated this morning to 0.99.6654 File version F Tank Wall Temperature Insulation(F).smz (106kb) downloaded 16 time(s).
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 15/04/2012(UTC) Posts: 1,986  Was thanked: 1124 time(s) in 721 post(s)
|
|
|
|
|
|
|
|
Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
|
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
Jean, I need the Y axis in degree F. This plots to Kelvin. Also, why did you define "isolate"? I should be able to use augment straight up ... shouldn't I? Also, how did you scale the graph? Edited by user 22 March 2018 20:36:57(UTC)
| Reason: Added question
|
|
|
|
|
|
Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
|
Originally Posted by: ElSid Jean,
I need the Y axis in degree F.This plots to Kelvin.
Also, why did you define "isolate"?I should be able to use augment straight up ... shouldn't I?
Also, how did you scale the graph? I'm reworking a bit the project, pretty messy. Hope it's correct from your reference(sss) Bloody Imperial system ! Instead of scaling the graph, use X_Y Maxima. Isolate to get rid of Units for plotting. Maybe multiply by the conversion K => F Jean
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
|
|
|
|
|
|
 Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,647  Location: Italy Was thanked: 1329 time(s) in 875 post(s)
|
Originally Posted by: ElSid I was trying to use the built in units to convert, but had the same issues going to degrees C. Nice worksheet. Have you tried with the solution porposed by martin? (°F instead of °C of course) Originally Posted by: mkraska ![2018-03-22 19_16_47-SMath Studio - [Tank%20Wall%20Temperature%20Insulation(F).smz_].png](/forum/resource.ashx?a=22577&b=2) ![2018-03-22 19_23_29-SMath Studio - [Tank%20Wall%20Temperature%20Insulation(F).sm_].png](/forum/resource.ashx?a=22578&b=2) Edited by user 22 March 2018 21:24:07(UTC)
| Reason: Not specified |
If you like my plugins consider to support SMath Studio buying a plan; to offer me a coffee: paypal.me/dcprojects |
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
Martin, I totally spaced your graphic. Can you explain the -0 degree C or F concept as this was not intuitive? I understand the delta T since we are subtracting temperatures ... Maybe this is just the work around and I answered myself Now the better part ... a loop. As the surface temperature is allowed to remain warmer, the thickness will increase. This should be similar to the Colebrook loop. I need to find my notes on that sheet. Edited by user 22 March 2018 23:13:05(UTC)
| Reason: Grammar
|
|
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 15/04/2012(UTC) Posts: 1,986 Was thanked: 1124 time(s) in 721 post(s)
|
Temperature gauges/units are special in that they may differ by a factor and an offset from a reference gauge. When using gauges without offset, just like K or °Rankine you can obtain the unitless numeric value by dividing the quantity by the unit. When you have an offset, you have to remove this first, hence the -0°F term. Then you divide by the relative unit matching your gauge. |
|
 1 user thanked mkraska for this useful post.
|
|
|
|
Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
|
OK, going back to sanity check some values. I'll work on the look after I get the units right. Martin, I thought I canceled out units per your comment above in the new FindRoot equation Version G Tank Wall Temperature Insulation(G).smz (107kb) downloaded 13 time(s). :'(
|
|
|
|
|
|
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.
