Thermodynamics B/C Build

smayya337
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Re: Thermodynamics B/C Build

Postby smayya337 » February 10th, 2019, 10:25 am

stevieb711 wrote:Is a k-value of -.00749 any good? Honestly I have no idea

It depends on the circumstances of your test. If you have a low volume and high temperature (e.g. 75mL and 75 degrees C), then I'd say that's pretty decent - we get -.009 to -.01. If it's on the other end of the spectrum (e.g. 125mL and 60 degrees C), that would be kind of high - we get -.004 to -.005. In the middle, that's a decent score - I'd expect about the same value from our box.
TL; DR: It depends on your volume and starting temperature, but at a medium volume and temperature, that's pretty good.
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Re: Thermodynamics B/C Build

Postby CPScienceDude » February 10th, 2019, 2:14 pm

smayya337 wrote:
stevieb711 wrote:Is a k-value of -.00749 any good? Honestly I have no idea

It depends on the circumstances of your test. If you have a low volume and high temperature (e.g. 75mL and 75 degrees C), then I'd say that's pretty decent - we get -.009 to -.01. If it's on the other end of the spectrum (e.g. 125mL and 60 degrees C), that would be kind of high - we get -.004 to -.005. In the middle, that's a decent score - I'd expect about the same value from our box.
TL; DR: It depends on your volume and starting temperature, but at a medium volume and temperature, that's pretty good.

Would a foam drink koozie count as a "commercially available thermos/cooler/vacuum sealed device"? (just look up foam drink koozie if you don't know what I'm talking about)
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Re: Thermodynamics B/C Build

Postby UTF-8 U+6211 U+662F » February 10th, 2019, 2:22 pm

CPScienceDude wrote:
smayya337 wrote:
stevieb711 wrote:Is a k-value of -.00749 any good? Honestly I have no idea

It depends on the circumstances of your test. If you have a low volume and high temperature (e.g. 75mL and 75 degrees C), then I'd say that's pretty decent - we get -.009 to -.01. If it's on the other end of the spectrum (e.g. 125mL and 60 degrees C), that would be kind of high - we get -.004 to -.005. In the middle, that's a decent score - I'd expect about the same value from our box.
TL; DR: It depends on your volume and starting temperature, but at a medium volume and temperature, that's pretty good.

Would a foam drink koozie count as a "commercially available thermos/cooler/vacuum sealed device"? (just look up foam drink koozie if you don't know what I'm talking about)

I doubt it but don't rely on being able to use it

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Re: Thermodynamics B/C Build

Postby CPScienceDude » February 10th, 2019, 2:25 pm

UTF-8 U+6211 U+662F wrote:
CPScienceDude wrote:
smayya337 wrote:It depends on the circumstances of your test. If you have a low volume and high temperature (e.g. 75mL and 75 degrees C), then I'd say that's pretty decent - we get -.009 to -.01. If it's on the other end of the spectrum (e.g. 125mL and 60 degrees C), that would be kind of high - we get -.004 to -.005. In the middle, that's a decent score - I'd expect about the same value from our box.
TL; DR: It depends on your volume and starting temperature, but at a medium volume and temperature, that's pretty good.

Would a foam drink koozie count as a "commercially available thermos/cooler/vacuum sealed device"? (just look up foam drink koozie if you don't know what I'm talking about)

I doubt it but don't rely on being able to use it

Ok, I included it in one of my early designs and it performed really well. But I didn't want to be told I wasn't allowed to use it at a competition and be screwed for my predictions.
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Re: Thermodynamics B/C Build

Postby JoeyC » February 10th, 2019, 2:37 pm

Just prepare a replacement ( a way it could be removed e.g.). If it can't be removed, then exacto/duct tape it enough it doesn't look like a commercial product. Some proctors can be really picky.
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Re: Thermodynamics B/C Build

Postby CookiePie1 » February 10th, 2019, 2:46 pm

JoeyC wrote:Just prepare a replacement ( a way it could be removed e.g.). If it can't be removed, then exacto/duct tape it enough it doesn't look like a commercial product. Some proctors can be really picky.


So you want to cut up and duct tape a commercially available thermos and try to pass it off as something you made yourself?

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Re: Thermodynamics B/C Build

Postby CPScienceDude » February 10th, 2019, 3:38 pm

CookiePie1 wrote:
JoeyC wrote:Just prepare a replacement ( a way it could be removed e.g.). If it can't be removed, then exacto/duct tape it enough it doesn't look like a commercial product. Some proctors can be really picky.


So you want to cut up and duct tape a commercially available thermos and try to pass it off as something you made yourself?

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WAIT. I can just pm Pikachu. She's running thermo at IN state.
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Re: Thermodynamics B/C Build

Postby JoeyC » February 10th, 2019, 7:08 pm

If you cut up and tape a commercially available thermos, it's no longer commercially viable, so it's no longer commercial. LOGIC.
(e.g. if you do that, you basically destroy it so much it doesn't even matter anymore if it was commercial)
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Re: Thermodynamics B/C Build

Postby UTF-8 U+6211 U+662F » February 10th, 2019, 7:19 pm

JoeyC wrote:If you cut up and tape a commercially available thermos, it's no longer commercially viable, so it's no longer commercial. LOGIC.
(e.g. if you do that, you basically destroy it so much it doesn't even matter anymore if it was commercial)

That sounds pretty sketchy to me and doesn't seem to have much of a point

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Re: Thermodynamics B/C Build

Postby CookiePie1 » February 10th, 2019, 8:05 pm

UTF-8 U+6211 U+662F wrote:
JoeyC wrote:If you cut up and tape a commercially available thermos, it's no longer commercially viable, so it's no longer commercial. LOGIC.
(e.g. if you do that, you basically destroy it so much it doesn't even matter anymore if it was commercial)

That sounds pretty sketchy to me and doesn't seem to have much of a point


It also sounds like interpreting the rules so you have an unfair advantage
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Re: Thermodynamics B/C Build

Postby JoeyC » February 11th, 2019, 4:07 am

Well then it's a good thing I've never done it, lol.
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Re: Thermodynamics B/C Build

Postby TheChiScientist » February 11th, 2019, 6:31 pm

JoeyC wrote:Well then it's a good thing I've never done it, lol.

>_>
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Re: Thermodynamics B/C Build

Postby Crimesolver » February 12th, 2019, 6:15 pm

any tips on getting my k constant lower. I didn't really focus on the build until now, and I realized how terrible my box is at retaining heat lol. I don't really want to build a whole new box, so is there any materials I can add to the box to help it retain heat better?
edit - i use that purple foam stuff and balsa wood
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Re: Thermodynamics B/C Build

Postby CPScienceDude » February 12th, 2019, 6:20 pm

Crimesolver wrote:any tips on getting my k constant lower. I didn't really focus on the build until now, and I realized how terrible my box is at retaining heat lol. I don't really want to build a whole new box, so is there any materials I can add to the box to help it retain heat better?
edit - i use that purple foam stuff and balsa wood

A - Wood isnt the best, try replacing it with styrofoam
B - More layers are better than less.
More info on how your box was built could help me get a better understanding on how it could be improved, though.
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Re: Thermodynamics B/C Build

Postby Crimesolver » February 12th, 2019, 6:23 pm

CPScienceDude wrote:
Crimesolver wrote:any tips on getting my k constant lower. I didn't really focus on the build until now, and I realized how terrible my box is at retaining heat lol. I don't really want to build a whole new box, so is there any materials I can add to the box to help it retain heat better?
edit - i use that purple foam stuff and balsa wood

A - Wood isnt the best, try replacing it with styrofoam
B - More layers are better than less.
More info on how your box was built could help me get a better understanding on how it could be improved, though.


The whole interior is just foam. I used really thick foam and used 3 layers of it and stuck it together. 1/4 in of balsa wood is used on the outside so that when the proctors measure our device, there won't be some foam just sticking out to get us disqualified.
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