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High tech comes to Am Sci & Surp!! It is here in the form of a Peltier junction, a thermo-electric device that translates electric power into heat, and perversely, into cool. Apply current @ 3-12 VDC to the gizmo and it extracts thermal energy from one face, thereby cooling it. The heat is dumped onto the other face, thereby heating it. Please note: you must use a heat sink on the hot side or the junction will fry itself, since it can quickly create a 65° C temperature differential in a no load situation. Stack two, or build a cascade to increase the thermal differential created. Or run it backwards. Apply heat or cold to the relevant face and produce a current. Amazing for science projects and experiments. Practical for coffee warmers, beer coolers and mini-refrigerator or warming oven applications. Comes with instructions. Large is 1-9/16" sq. x 3/16" thick.
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Heating Element
To heat what is anybody's guess, but it's a U-shaped heating element, 8-3/8" x 2-5/8" x 1/4" dia with a 107 Ohm Resistance and rubber grommets above the 3/16" wide power terminals. When CJ heated it up to 120F, those grommets got gooey, so he says use lower voltage DC.
$3.75 EACH
This Is Just Cool
It’s a Peltier junction rated at 12VDC, 2.2 Amps, and attached to a heat sink and a muffin fan, making it all a self-contained cooling unit measuring 1-9/16” x 2-3/16” x 3-1/4”. Techie talk: the fat red & black leads are for the Peltier; thinner ones feed the fan, and there’s a yellow or white thermal sensor lead on the same plug. Separate green and yellow leads are to the thermistors at the top of the cool side of the heat sink. Made in the USA.
$24.50 EACH
Humidity Is Relative
You need a dehumidistat to sense the relative humidity and turn on a fan or whatever dehumidifies you. This one is from Broan-NuTone and is rated for up to a 10A load at 120VAC and 5A at 240VAC but can be used with a low-voltage (24V or less) fan. Use the clearly marked, easy-to-use dial to set your humidity anywhere from 20 to 80 percent, with full on and off settings as well. Housing measures 4-1/2” x 2-3/4” x 1-1/2” with keyed 5/32” mounting holes. Comes with mounting hardware, Lo-V terminals and wiring instructions. Made in Canada by humid Canadians. Broan #DH100W.
$14.50 EACH
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