Insulation - Set up as solve block? - Сообщения
#1 Опубликовано: 19.03.2018 16:21:45
Brain fried. Looking for some help re-structuring this. At least the students understood this math 
Tank Wall Temperature Insulation.smz
Tank Wall Temperature Insulation.smz
#2 Опубликовано: 19.03.2018 19:58:25
What exactly do you want to do?
#3 Опубликовано: 19.03.2018 21:41:47
Looking for some help re-structuring this.
https://www.sfu.ca/~mbahrami/ENSC%20388/Notes/Staedy%20Conduction%20Heat%20Transfer.pdf
#4 Опубликовано: 20.03.2018 11:04:27
Sorry. I'm looking to have SMath do the algebraic manipulation ...
#5 Опубликовано: 20.03.2018 15:20:08
Sorry.I'm looking to have SMath do the algebraic manipulation ...
Smath will not do it by itself, unless appropriately coded.
http://se.asee.org/proceedings/ASEE2004/P2004127chemiHOD.pdf
#6 Опубликовано: 20.03.2018 17:31:24
Different approach. Trying to use FindRoot. Tank Wall Temperature Insulation(C).smz
Right now, I have a manual override.
Right now, I have a manual override.
#7 Опубликовано: 21.03.2018 01:04:01
Different approach
Attach *.sm ... instead.
#8 Опубликовано: 21.03.2018 08:57:29
Jean,
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
Different approach. Trying to use FindRoot. Tank Wall Temperature Insulation(C).smz
Right now, I have a manual override.
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
#9 Опубликовано: 21.03.2018 15:07:44
Not sure what I did, but FindRoot seems to have worked ...
Sanity check Rev E? Tank Wall Temperature Insulation(E).smz
Next is to add a plot --> Ins. thickness vs. T1
Sanity check Rev E? Tank Wall Temperature Insulation(E).smz
Next is to add a plot --> Ins. thickness vs. T1
#10 Опубликовано: 21.03.2018 17:29:30
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
#11 Опубликовано: 22.03.2018 12:40:43
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
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
#12 Опубликовано: 22.03.2018 13:41:14
Martin Kraska
Pre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
#13 Опубликовано: 22.03.2018 13:52:44
#14 Опубликовано: 22.03.2018 14:18:55
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 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?
#15 Опубликовано: 22.03.2018 14:47:18
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
#16 Опубликовано: 22.03.2018 14:51:32
Thank you Jean. The units should be adjustable per https://en.smath.info/forum/yaf_postst4793_Ploting-equation-with-units-does-not-work.aspx. I was trying to use the built in units to convert, but had the same issues going to degrees C.
#17 Опубликовано: 22.03.2018 15:20:02
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)
If you like my plugins please consider to support the program buying a license; for personal contributions to me: paypal.me/dcprojects
#18 Опубликовано: 22.03.2018 16:28:44
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.
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.
#19 Опубликовано: 22.03.2018 17:13:17
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.
Martin Kraska
Pre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
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ElSid 22.03.2018 17:37:00
#20 Опубликовано: 23.03.2018 12:29:48
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
Martin,
I thought I canceled out units per your comment above in the new FindRoot equation
Version G Tank Wall Temperature Insulation(G).smz
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