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17-05-2006, 02:58 PM | #51 | |
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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:
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17-05-2006, 11:59 PM | #52 |
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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. |
18-05-2006, 01:42 AM | #53 |
Dragon
Join Date: May 2005
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will it not short circuit when the components touch water?
thanks for clarification. rgds, |
18-05-2006, 04:57 PM | #54 |
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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? |
18-05-2006, 05:09 PM | #55 |
Endangered Dragon
Join Date: Sep 2002
Posts: 5,414
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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. |
18-05-2006, 06:10 PM | #56 |
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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? |
18-05-2006, 06:18 PM | #57 | ||
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Let me answer for Joe.
Quote:
Quote:
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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18-05-2006, 09:59 PM | #58 |
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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... |
18-05-2006, 10:17 PM | #59 | |
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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:
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19-05-2006, 01:53 AM | #60 |
Senior Dragon
Join Date: Jul 2004
Posts: 4,136
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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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