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Old 27-02-2006, 03:37 PM   #31
silane
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Quote:
Originally Posted by Arrowana17
can meh? got any pple try?

Cannot lah, this is passive cooler cannot cool below ambience temperature. If such works, our fridge will be just fans and meta blocks.

Cooling CPU is a different matter, it is cooling above ambience temperature.
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Old 01-03-2006, 06:36 PM   #32
jojoe cute
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Just completed .....

Wonder how low it can cold a 1.5ft....

peltier is 75watt only..

any bro can help me to calculate the lowest it can cold?

Last edited by jojoe cute; 10-06-2006 at 10:50 PM.
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Old 01-03-2006, 07:21 PM   #33
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Quote:
Originally Posted by jojoe cute
Just completed .....

Wonder how low it can cold a 1.5ft....

peltier is 75watt only..

any bro can help me to calculate the lowest it can cold?
Nice look DIY. You should put it to test to determine the cooling because how much the cooling is also affected by insulation, fan speed ..etc.

Your probe is aluminmium also ?
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Old 01-03-2006, 07:32 PM   #34
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Quote:
Originally Posted by jojoe cute
Just completed .....

Wonder how low it can cold a 1.5ft....

peltier is 75watt only..

any bro can help me to calculate the lowest it can cold?

What's the ambient temperature? It play an important part. Also what is the heat resistance of the heatsink and fan assembly? Without that cannot accurate calculate the expected temperature it can acheieve.
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Old 01-03-2006, 07:55 PM   #35
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Now i don't have small tank to test water cold to wat oC...

Yes the probe is aluminium too...


Quote:
Originally Posted by byfun
Nice look DIY. You should put it to test to determine the cooling because how much the cooling is also affected by insulation, fan speed ..etc.

Your probe is aluminmium also ?
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Old 01-03-2006, 07:57 PM   #36
jojoe cute
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Let say room temp at 27oC....
Fan is 0.4A

Quote:
Originally Posted by silane
What's the ambient temperature? It play an important part. Also what is the heat resistance of the heatsink and fan assembly? Without that cannot accurate calculate the expected temperature it can acheieve.
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Old 01-03-2006, 08:05 PM   #37
silane
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Quote:
Originally Posted by jojoe cute
Just completed .....

Wonder how low it can cold a 1.5ft....

peltier is 75watt only..

any bro can help me to calculate the lowest it can cold?

For calculation, 38W of cooling power is used, that is a reasonable expectation of cooling power from a 75W peltier.

It is expected to cool a standard 1.5 tank from ambient 30C to 27.3C, with 100% of the time running at electrical power of 75W.

It is expected to cool a standard 1.5 tank from ambient 29C to 26.3C, with 100% of the time running at electrical power of 75W.

It is expected to cool a standard 1.5 tank from ambient 29C to 26.6C with 5W of heat introduced by lamp and filter, with 100% of the time running at electrical power of 75W.

Above calculation is done with assumption that the heatsink and fan assembly can handle the heat sufficiently.

Last edited by silane; 01-03-2006 at 08:18 PM.
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Old 01-03-2006, 11:37 PM   #38
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Quote:
Originally Posted by jojoe cute
Let say room temp at 27oC....
Fan is 0.4A
what about Target Temperature ? need that to calculate the power to cool how many degrees below ambient .

cheers
xtrekker

Last edited by xtrekker; 01-03-2006 at 11:44 PM.
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Old 01-03-2006, 11:40 PM   #39
jojoe cute
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Looking at 24-25 is more then enough....


Quote:
Originally Posted by xtrekker
Target Temperature leh ? Want to cool how many degrees elow ambient ?

cheers
xtrekker
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Old 01-03-2006, 11:44 PM   #40
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Quote:
Originally Posted by jojoe cute
Looking at 24-25 is more then enough....
so how? managed to achieve????....if successful, can help me to diy? pls....

coz my room temperature is abt 31 to 32 degree celsius

Last edited by Arrowana17; 01-03-2006 at 11:51 PM.
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