And you were proven wrong in 6 minutes. Good-bye.

Good grief #13, if that is directed at me, what the heck are you on about. No one has proven anything to anyone at all. HAVE A NICE DAY

 

And you were proven wrong in 6 minutes. Good-bye.

@#12: I could be wrong, but I don't think the TS was being sarcastic -- I read it as they were genuinely thanking you for pointing out that they might be chasing a solution to a problem that doesn't exist. Again, could be wrong -- I can see how it MIGHT have been meant to be sarcastic. Hopefully the TS can clarify.

 

...Also, I have stated that the LDO *WILL* be attached to a heatsink. Thanks for replying

I didn't mean to imply otherwise - I was just reiterating the importance of it in this case because of how much heat it'll be generating. No offense was intended. Sorry if it came out wrong.

 

Lower the voltage to get more cooling?

So why not just short the device (i.e., zero volts) to get maximum cooling?

Are you familiar with how a Peltier works?

The device is specifically designed so that, over the intended range of operation, the Seebeck effect dominates the Ohmic resistance and thermal conductance effects so that the more power you put to the module, the more cooling power you obtain. They would be pretty useless otherwise.

Yes I am familiar with these devices and how people use them. Everyone thinks more is always better, so if it is not cold enough pour more power into it. They are very inefficient heat pumps. if he puts 5A @ 12 volts into it he has to get rid of 60 watts of heat before he gets any below ambient cooling effect.

Example with numbers:

Ambient 20 deg C

Useing a very large heat sink say 1 deg C per watt on the hot side, 12v and 5a. A peltier will develop a maximum of 30 deg difference between how and cold side. At 60 watts the hot side will be 80 deg C and the cold side will be 50 deg c - no exactly very much colder than ambient. (a small hand wave as the temp would be a little lower because heat would also be lost from the cold side.)

Now same conditions but supply the peltier with whatever voltage will cause 10 watts of power. The hot side will rise to be at most 30 deg c and the cold side will be as low as 0 degree c providing care is taken to limit external heat flowing into the cold side.

Which is colder 0 deg C or 50 deg C?

Dear Mr Moderator, I never suggested anything as stupid as zero voltage for max cooling - that is all on you. I have used peltiers that is why I am aware of the practical limits they have. Why do you think a cheap to make, no moving part and essential unlimited lifetime cooling device, that has been known about for decades, has not replaced mechanical refrigeration methods? You also might like to read some of the posts on Use net by Phill Hobbs who has used them for exactly this purpose.

 

Yes, they are extremely inefficient, which why they only have limited applications.

I am responding as a member, not as a moderator -- unless you think you did something that requires mod action?

 

Dear Mr Moderator, I never suggested anything as stupid as zero voltage for max cooling - that is all on you.

I was thinking about this last night in bed and realize that I misread your post. I thought you were giving an OR list -- do any one of these things and it will make things colder. I realize now that you were essentially giving an AND list -- do all of these things and it will make things colder (though not strictly all of them).