|
fwiw) Some more figures related to peltier coolers and air flow.
Density of air = 1.29g/L
Specific heat of air = 1 Joule per gram
1 cubic foot of air = 28.3L (36.6 grams)
A 1cfm fan will shift 2190 grams of air in 1 hour.
2190 grams of air divided by 3600 = 0.61 (temperature rise of the air with 1 Watt applied.
It therefore follows that if you are trying to extract 100 Watts of heat from a bank of peltier
coolers and you wish to keep the air ejected at no more than 0.5C above ambient.
you will need to provide the heat sinks with an air flow of approximately 120 cfm.
best,
~c
<edit> I should point out that the figure of 100 Watts and an air delta T of 0.5C are arbitrary.
The above example is simply to give you a feel for the relationship of air flow and energy dissipation.
Last edited by clive milne; 30-11-2011 at 03:02 PM.
|