Endothermic Task

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TheSquaad
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Re: Endothermic Task

Post by TheSquaad » November 2nd, 2018, 6:48 am

mpnobivucyxtz wrote:Our team is currently thinking of using a Peltier cooler and detecting the change in the heat with a thermistor. However, I can't figure out whether this would be endothermic. The cooler definitely loses heat so by definition, the thermistor touching it would be gaining heat (so endothermic). Would this be valid or is too much of a stretch?
Our team did that exact process last year, and nobody questioned it at the 5 competitions we went to

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Re: Endothermic Task

Post by PM2017 » November 3rd, 2018, 11:39 am

TheSquaad wrote:
mpnobivucyxtz wrote:Our team is currently thinking of using a Peltier cooler and detecting the change in the heat with a thermistor. However, I can't figure out whether this would be endothermic. The cooler definitely loses heat so by definition, the thermistor touching it would be gaining heat (so endothermic). Would this be valid or is too much of a stretch?
Our team did that exact process last year, and nobody questioned it at the 5 competitions we went to
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Re: Endothermic Task

Post by nmurali2002 » November 4th, 2018, 6:09 am

I'm trying to find a good PTC thermistor, but everything I've seen has an ideal operating temperature of around 25 degrees Celsius. Anyone have a thermistor with a lower ideal temperature? (or a site that lets you sort by curie point).

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Re: Endothermic Task

Post by erico.vert » November 7th, 2018, 4:50 pm

I've seen a lot of peltier devices online but they all say they run at 12 volts. Since this year we can only use 9 volts, would the device still operate just not as well, or would I have to go digging for a 9v one. Also, if someone knows of a 9v one, could you link it please? Much appreciated

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Re: Endothermic Task

Post by cheese » November 7th, 2018, 5:19 pm

Or buy a 5v peltier cooler: https://www.adafruit.com/product/1331
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Re: Endothermic Task

Post by nmurali2002 » November 8th, 2018, 4:05 pm

mpnobivucyxtz wrote:Our team is currently thinking of using a Peltier cooler and detecting the change in the heat with a thermistor. However, I can't figure out whether this would be endothermic. The cooler definitely loses heat so by definition, the thermistor touching it would be gaining heat (so endothermic). Would this be valid or is too much of a stretch?
The rules say "initiates the next action as a result of the reduction in temperature". I suppose that you could say the reduction in temperature of your heat sink causes the increase in temperature of your thermistor?

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Re: Endothermic Task

Post by annabelle0308 » November 26th, 2018, 2:07 pm

Would a baking soda/vinegar balloon count as “endothermic”? I’m not talking about the action where you need to blow up a balloon 20cm, but is the reaction between vinegar and baking soda itself considered endothermic?

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Re: Endothermic Task

Post by TheSquaad » November 26th, 2018, 3:23 pm

annabelle0308 wrote:Would a baking soda/vinegar balloon count as “endothermic”? I’m not talking about the action where you need to blow up a balloon 20cm, but is the reaction between vinegar and baking soda itself considered endothermic?
4bii specifies that for the endothermic action, the next action must be initiated due to a reduction in temperature. A baking soda/vinegar reaction inflates a balloon by producing gas, not by reducing temperature. So using that as an endothermic process would not be legal.

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Re: Endothermic Task

Post by Chikoo10 » January 13th, 2019, 3:00 pm

Does anyone have a link to a good PTC Thermistor that will work with the peltier device?

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Re: Endothermic Task

Post by DarthBuilder » January 13th, 2019, 5:24 pm

I was wondering about that as well
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