Endothermic Task

[TheSquaad]

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

[PM2017]

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

This is what we're doing.

[nmurali2002]

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).

[erico.vert]

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

[cheese]

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

[nmurali2002]

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?

[annabelle0308]

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?

[TheSquaad]

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.

[Chikoo10]

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

[DarthBuilder]

I was wondering about that as well