Thermodynamics B/C Build

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TheChiScientist
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Re: Thermodynamics B/C Build

Postby TheChiScientist » September 16th, 2018, 8:45 am

Jacobi wrote:
TheChiScientist wrote:
Jacobi wrote:What kind of model do you use to predict temperature? I used a simple exponential model, but it was hard to correct for the specific heat of the device.

Any and all help appreciated.

Is your exponential model based on a line of best fit or one data set only? I would recommend sticking to one data set as it is less time consuming and the use simple exponential model. That should make work easier... Not sure what else could be done but it did help me get 1st place at the ISO state tournament. :D Feel free to ask questions as I am happy to help. (Shame I ain't doing thermo this year...) :cry:

We did lots of data sets on various runs.

Hum. Ok then given that what you're doing is fine because it would help reduce error unless your standard deviation is too high...
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Re: Thermodynamics B/C Build

Postby JoeyC » September 17th, 2018, 8:24 am

Jacobi wrote:
TheChiScientist wrote:
Jacobi wrote:What kind of model do you use to predict temperature? I used a simple exponential model, but it was hard to correct for the specific heat of the device.

Any and all help appreciated.

Is your exponential model based on a line of best fit or one data set only? I would recommend sticking to one data set as it is less time consuming and the use simple exponential model. That should make work easier... Not sure what else could be done but it did help me get 1st place at the ISO state tournament. :D Feel free to ask questions as I am happy to help. (Shame I ain't doing thermo this year...) :cry:

We did lots of data sets on various runs.

You should be fine. I personally use logarithmic because I think it makes more sense, but as long as you can predict a temperature with it, it should be fine; given the amount of mishaps that can occur when running, there is no 100% accurate (in practical terms) graph.
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Re: Thermodynamics B/C Build

Postby DarkSparklyUnicorn » September 24th, 2018, 9:21 am

TheChiScientist wrote:So what type of thermometers do you guys use for maximum accuracy? (I go digital)


Since I'm a foodie, I have my trusty thermapen to use. It's fast, accurate, but also pretty expensive. Best food thermometer I've ever used.

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Re: Thermodynamics B/C Build

Postby WhatScience? » September 29th, 2018, 9:41 am

Obviously, a common design in Div B is the box in a box design. I'm wondering if any of y'all have had success with that in Div C with the 15cm rule. What thickness of wood do you recommend for the boxes? Or if not what, what other material.
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Thermodynamics B/C Build

Postby someone1580 » September 29th, 2018, 12:23 pm

Just a quick question...


Are we allowed to use FOAMULAR? I believe it's made by the same company that makes fiberglass.

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Re: Thermodynamics B/C Build

Postby wxyz » September 29th, 2018, 1:43 pm


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Re: Thermodynamics B/C Build

Postby TheChiScientist » September 29th, 2018, 4:56 pm


As your lawyer, I would advise against it. Per Chapter 3 subsection a it states "Devices may be constructed of and contain anything except the following materials/components: asbestos; mineral wool; fiberglass insulation; commercially available thermoses/coolers/vacuum sealed devices." Yet also as your lawyer I suggest you can make a case that it is not a vacuum sealed device (Such as a yeti) but it is a vacuum sealed insulator. To be safe I would submit an FAQ to soinc and ask what qualifies as a vacuum sealed device.
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Re: Thermodynamics B/C Build

Postby wxyz » September 29th, 2018, 7:15 pm

Thanks for the answer.
Has anyone else noticed that plastic beakers are much bigger than glass ones, even though they are marked for 250 mL?

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Re: Thermodynamics B/C Build

Postby bernard » October 1st, 2018, 1:09 am

wxyz wrote:Thanks for the answer.
Has anyone else noticed that plastic beakers are much bigger than glass ones, even though they are marked for 250 mL?

May just be where they each came from. Manufacturers seem to vary in the amount of extra room left in glassware.
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Re: Thermodynamics B/C Build

Postby libscioly » October 6th, 2018, 12:07 pm

Does anyone know if it would be advantageous to use oxygen absorbers that come with mylar bags, and if this would even be allowed? Thanks!

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Re: Thermodynamics B/C Build

Postby Alex-RCHS » October 6th, 2018, 6:16 pm

libscioly wrote:Does anyone know if it would be advantageous to use oxygen absorbers that come with mylar bags, and if this would even be allowed? Thanks!

The bags or the absorbers? Why would that be advantageous?
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Vaccuum seals

Postby JoshChaboyaB » October 13th, 2018, 5:33 pm

Are gallon sized ziplock baggies included in the "commerial" vacuums, or are they allowed?

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Re: Vaccuum seals

Postby CookiePie1 » October 14th, 2018, 1:30 pm

JoshChaboyaB wrote:Are gallon sized ziplock baggies included in the "commerial" vacuums, or are they allowed?


Last I checked, Ziplock baggies aren't very good insulators nor are they vacuum coolers, so it should be fine for you.
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Re: Thermodynamics B/C Build

Postby Maria.S » October 15th, 2018, 12:50 pm

Thermo is a great event for all who like studding heat and cold.

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Re: Thermodynamics B/C Build

Postby UTF-8 U+6211 U+662F » October 15th, 2018, 12:55 pm

Maria.S wrote:Thermo is a great event for all who like studding heat and cold.

I'd just like to point out that it doesn't just involve hot and cold but also the nature of energy, gas theory, etc.

But thermodynamics is pretty cool.


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