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02-03-2006, 12:18 AM | #41 | |
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Still waiting for some bro. help to calculate....
See how low it can cold.... Wah yr room so warm ah? U keeping wat shrimp... Quote:
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02-03-2006, 01:11 AM | #42 | |
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Qc = C x m x dT c = 4816 J / kg m= 40 dt = 4 degrees C ( asumming ambient of 28C cooled to 24C) Qc is heatload of your tank. From software simulation , joe's 40L tank's heatload is 68.67W. You need a TEM with Qc of at least 69W for ideal situation. would recommend you get a TEM with Qc of at least 90W. Your 75W Tem only has Qc(max) of around 40W . cheers xtrekker Last edited by xtrekker; 02-03-2006 at 01:17 AM. |
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02-03-2006, 02:07 AM | #43 | |
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Thank for the validation, we are close. |
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02-03-2006, 02:12 AM | #44 | |
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02-03-2006, 08:56 AM | #45 |
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dun noe wat shrimp....i bought frm the previous owner the entire set up...so far....1 yellow goby n 1 clownfish n 1 damsel die liaoz...i tink becoz of the heat n water condition...
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02-03-2006, 11:58 AM | #46 |
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Thanks
Thanks bro....
Silane & xtrekker, for the calculation... So it may only work on 1.5Ft tank size & below... I put balck sticker on heatsink, so lit look nicer.. Wonder the sticker will melt off anot le... Last edited by jojoe cute; 10-06-2006 at 10:50 PM. |
02-03-2006, 12:24 PM | #47 | |
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02-03-2006, 01:49 PM | #48 |
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Its beyond any reasonable doubts that it looks better in black .Dun forget that sticking a sticker is like sticking a thin layer of insulation to your heatsink. The purpose of heatsink is to dissipate heat. Not insulate. If want to look good , and increase the heat dissipation of your heat sink i suggest that you should anodised your heatsink.
It might work but if any conditions change yours do not have to power to overcome it . just like a sampan it will be smooth sailing on clam sea but can it cope with a storm? Well , nothing in this world can work till you try it out. The calucation is a simplified version its just provide a rough guide for chosing a TEM. Those ppl taking thermodyamics will be laught at it. Calculating the Qc is complex with alot of realtime variablies. To help you understand better there are a few assumptions i made : 1. Your ambient temp is at 27C and its at steady state ie remains constant throughtout the entire operation. 2. There are no other heat input except from your 5mm glass of tank is taking in heat at 0.8w/m/k , active heatload (filter pump ) is at 10W. things exculded is radiation heat from your lighting , any warm blooded occupants in your tank , etc 3. Conditions are assumed steady-state (do not change with time) ie constant external conditions, constant internal temperature 4. Ideal coupling of your cold plate to TEM to heatsink. That is the heat would flow "smoothly" from your tank to heatsink without any thermal resistance , junction to junction resistance. I might be wrong. Anyone pls point out any mistake or assumptions i made. cheers xtrekker. |
02-03-2006, 03:56 PM | #49 | |
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I am overwhelmed by the info. One more sink to ambient thermal resistance also play a part too, which need to be small enough to handle the heat. |
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02-03-2006, 04:02 PM | #50 | |
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Thank, Karen. |
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