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Post by jackallwardt on Jul 23, 2008 12:15:04 GMT -8
During this exteme hot time of the year, one wonders about man's best friend, who would rather sit in "his/her" car until the person comes back, rather than sit at home all alone.
I've been using a 12v oscillating fan and it does wonders up to about 100F outside, and for no longer than 1-2 hours at a time, if the vehicle is in the shade.
What I envision, is a "mini" a/c unit that can live on the open window--venting heat to the outside and providing a cool surface to blow air across. I know that we can't cool the entire vehicle, but--a small stream of chilled air would/could be advantageous for the animal.
Has anyone attempted something like this? If so, can you share the down-side and draw-backs with me?
Thnx, ja
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Post by Gary Lecomte on Jul 28, 2008 6:53:28 GMT -8
The First Real Problem is How do you cool the Peltier Device? The Second problem is: You need considerable Current. During this exteme hot time of the year, one wonders about man's best friend, who would rather sit in "his/her" car until the person comes back, rather than sit at home all alone. I've been using a 12v oscillating fan and it does wonders up to about 100F outside, and for no longer than 1-2 hours at a time, if the vehicle is in the shade. What I envision, is a "mini" a/c unit that can live on the open window--venting heat to the outside and providing a cool surface to blow air across. I know that we can't cool the entire vehicle, but--a small stream of chilled air would/could be advantageous for the animal. Has anyone attempted something like this? If so, can you share the down-side and draw-backs with me? Thnx, ja |
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Post by Dale Frizzell on Jul 28, 2008 13:50:54 GMT -8
you can go to this site www.allelectronics.com/make-a-store/category/775/Thermoelectric-Coolers/1.html12 Vdc heater / cooler assembly utilizes a Peltier device to create heat on one side and cold on the other. Driven by a 40 mm square Peltier thermoelectric heat pump, it operates on 13 Vdc @ 5 Amps. Operating at 13 Vdc, we measured the hot side at 190 Deg. F and the cold side at 55 Deg F. The hot side of the Peltier device is connected directly to a 4.0" x 4.5" x 1.5" heatsink. The cool side connects via an aluminum block to another heatsink that is 5.0" x 5.0" x 1.25". The overall thickness of the unit is 3.8". The Peltier device and the aluminum spacer are between the heatsinks, embedded within an insulating block 1.1" thick. See online "Spec Sheet" section for a disassembled picture. 8" wire leads. Weight: 2.6 lb. |
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Post by Gary Lecomte on Jul 29, 2008 5:21:23 GMT -8
Yes they can do that when at reasonable Ambient air temperatures and with no moving air on the cold side, but inside a vehicle where the Ambient temperature is already Hot, You will not get that cooling. And with a Fan TRYING to Blow the cool Air from the Cold Side, it will reduce the effect even more. Lastly, a Fan is required on the Hot side to dissipate the heat and this Will further increase the temperature Inside the car. you can go to this site www.allelectronics.com/make-a-store/category/775/Thermoelectric-Coolers/1.html12 Vdc heater / cooler assembly utilizes a Peltier device to create heat on one side and cold on the other. Driven by a 40 mm square Peltier thermoelectric heat pump, it operates on 13 Vdc @ 5 Amps. Operating at 13 Vdc, we measured the hot side at 190 Deg. F and the cold side at 55 Deg F. The hot side of the Peltier device is connected directly to a 4.0" x 4.5" x 1.5" heatsink. The cool side connects via an aluminum block to another heatsink that is 5.0" x 5.0" x 1.25". The overall thickness of the unit is 3.8". The Peltier device and the aluminum spacer are between the heatsinks, embedded within an insulating block 1.1" thick. See online "Spec Sheet" section for a disassembled picture. 8" wire leads. Weight: 2.6 lb. |
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