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Old 17-05-2006, 02:58 PM   #51
jojoe cute
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Sorry bro Arolee999....

At the moment i m not going to DIY any unit, so may not show u the behind portion of HOF.........

A guide for u, i cut a square hole on the HOF which alot the peltier & cooling probe to be sandwich. Then silicon it together...

Quote:
Originally Posted by Arolee999
Nice setup!! Bro...can show some picture behind your HOF? How you sticked the peltier and cooling unit on your HOF? Thanks!
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Old 17-05-2006, 11:59 PM   #52
congshao88
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A simple illustration of peltier which I tot might help to understand more:

Peltier devices, also known as thermoelectric (TE) modules, are small
solid-state devices that function as heat pumps. A "typical" unit is a few
millimeters thick by a few millimeters to a few centimeters square. It is
a sandwich formed by two ceramic plates with an array of small Bismuth
Telluride cubes ("couples") in between. When a DC current is applied heat
is moved from one side of the device to the other - where it must be removed
with a heatsink. The "cold" side is commonly used to cool an electronic
device such as a microprocessor or a photodetector. If the current is
reversed the device makes an excellent heater.

As with any device, TE modules work best when applied properly. They are not
meant to serve as room air conditioners. They are best suited to smaller
cooling applications, although they are used in applications as large as
portable picnic-type coolers. They can be stacked to achieve lower
temperatures, although reaching cryogenic temperatures would require great care.
They are not very "efficient" and can draw amps of power. This disadvantage is
more than offset by the advantages of no moving parts, no Freon refrigerant, no
noise, no vibration, very small size, long life, capability of precision
temperature control, etc.
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Old 18-05-2006, 01:42 AM   #53
wllm33
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will it not short circuit when the components touch water?
thanks for clarification.
rgds,
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Old 18-05-2006, 04:57 PM   #54
axela11
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that's what i was thinking too. can the peltier touch water? or only the heatsink which is used as a cooling probe is in contact with water?

also.. can a normal AC-DC adaptor be used instead of the power supply unit? or are those not powerful enough?
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Old 18-05-2006, 05:09 PM   #55
fireblade
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from http://www.tellurex.com/12most.html

Can these devices be immersed?
Only for cleaning purposes and never while under power. TE devices should always be dry when under use to prevent thermal and electrical shorting.
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Old 18-05-2006, 06:10 PM   #56
axela11
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Oh, ok thanks bro! That means only the heatsink which bro jojoe used as a cooling probe is in contact with water and nothing else is touching the water?

I've got one more question, is it ok to leave this device on 24/7 if I don't install a thermostat?
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Old 18-05-2006, 06:18 PM   #57
schema
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Let me answer for Joe.

Quote:
Originally Posted by wllm33
will it not short circuit when the components touch water?
thanks for clarification.
rgds,
Only the "cooled" heatsink portion will be submerged in water, the HOF will have to be modded with a sq hole the sealed back with silicon after installation.

Quote:
Originally Posted by axela11
that's what i was thinking too. can the peltier touch water? or only the heatsink which is used as a cooling probe is in contact with water?

also.. can a normal AC-DC adaptor be used instead of the power supply unit? or are those not powerful enough?
Peltier don't touch water, but buy only sealed type, there is still chances for condensation that will kill peltier.
AC-DC adaptor got not enuff oomp(current) to drive peltier, it will run very hot and finally die, oso it cannot achieve the coldness as advertised!
Run some calculation bf diving.
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Old 18-05-2006, 09:59 PM   #58
jojoe cute
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Dear bros,

Many thanks for replying to those questions, I am late.... hehehe....

Remembered, don't because of few dollars cheaper.. U grab the items and & DIY, end up u will lost more $$ on yr DIY...
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Old 18-05-2006, 10:17 PM   #59
jojoe cute
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Yes, u can run it 24/7...
As wat I know, peltier lifespan is around 50,000 hours = 4 - 5 years (correct me if I m wrong)

Purpose of add on Themostat is trying to save some electric bill, prolong the lifespan of electronic parts and also try maintain stable temperature ...


Quote:
Originally Posted by axela11
I've got one more question, is it ok to leave this device on 24/7 if I don't install a thermostat?
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Old 19-05-2006, 01:53 AM   #60
silane
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Hi all,

Tested this unit:


Result is pretty acceptable, the temperature is between 25C to 26C with a large pail (12litre) of water.
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