PCFormat Forum Archive

Greetings, this has now turned into a frantic matter of urgancy. To who ever got the April mag, I would like to know some info has anyone been able to get themselves a PELTIER HEAT PUMP. I have only found site in america and nothing here only industrial* applications I really want to make one of these USB fridges but i cant do Jack until i get a peltier device. Please can someone help

Thanks Lambogiggy.

First off - try some punctuation and breaking the paragraph into readable sentences, you're hurting my eyes.

Secondly - have a look here.

http://www.mantech.co.za/Stock.aspx?Query=MARLOWand search for tec coolers but because you'll be running it on usb 1, you have access to 100 mA

Haha , shame Doo cut the guy some slack, he's new around here even though it HURTS US

THanks Doo saw this article and have tasked the g/f for making it for me! I shall report back once the wine chiller has been completed!

Anakha, where will you be sourcing your cooler ? I am considering ebay (since that is what the PCF guys recommend)

Lambogiggy wrote:Greetings, this has now turned into a frantic matter of urgancy. To who ever got the April mag, I would like to know some info has anyone been able to get themselves a PELTIER HEAT PUMP. I have only found site in america and nothing here only industrial* applications I really want to make one of these USB fridges but i cant do Jack until i get a peltier device. Please can someone help

Thanks Lambogiggy.

Nice effort on the punctuation. thanks.

You wanna build a USB Fridge. Ahhh. OK. So my link is totally worthless!

I haven't seen the latest PCF, i proabably won't. How big does this this need to be?

you could harvest a the unit from a cheap peltier cooler bought at makro but those things draw 4 amps at 12 volts.

Anthro wrote:Anakha, where will you be sourcing your cooler ? I am considering ebay (since that is what the PCF guys recommend)

Not sure yet finally followed doo(s) link and realised that he suckered me .

Will look at Primes link to investigate my options, if you go ebay maybe we could share costs?

Anakha56 wrote:

Anthro wrote:Anakha, where will you be sourcing your cooler ? I am considering ebay (since that is what the PCF guys recommend)

Not sure yet finally followed doo(s) link and realised that he suckered me .

Will look at Primes link to investigate my options, if you go ebay maybe we could share costs?

That's supposed to be a hyphanated "s"!!!



Send me a link to what you want to get from e-bay. This is sounding like something that'll work for beer!

*sigh*

I should probably go buy the PCf and read exactly what they say before i do this, but anyway.

Your COP is likely to be less than 1. Your USB port will only supply 100mA unless you can somehow convince it otherwise. I seem to recall that they olny run at USB 2 speeds if the device tells them too. 0.1A*12V = 1.2W of electrical power. Assuming a COP of 1, your cooler will pump 1.2watts. thats 1.2 joules of heat energy a second.

Q=m*c*delta(t) Ignoring the thermal mass of the can or bottle, c =4.186x103, m = 0.33kg

assuming you want to chill your beers by 10 degrees celcius:

Q = 13813.8joules. thats 11511.5 seconds which roughly 191 minutes.

This ignores heat losses to the environment.

Someone please check my thermodynamics, but as far as i can see, you might want to think about this carefully before spending too much on it.

Go buy a cheap cooler from makro, they had some 48 watt campmaster ones for 500 bucks. open it up and put better fans in it and run it off you power supply. It draws 4 amps and will hold alot more beer.

edit: http://www.coolchips.gi/technology/ccalc.shtml

doo_much wrote:First off - try some punctuation and breaking the paragraph into readable sentences, you're hurting my eyes.

Secondly - have a look here.

Linking to a TT product? A rickroll would've been a lesser contravention of the rules.

Hi there, you can get peltier module at electronics123 dot co dot za... Have it there for about R170... Product code AB103

I think i'll save myself the problem of sourcing stuff by just buying this:

http://www.mygoodies.co.za/catalog/usb- ... p-147.html

Thanks Ryan Save me money and time, now I just need to make some measurements...

I emailed them, i want to know the wattage and if its metal and insulated.

Finally, a response from Dream Cheeky

Dream Cheey wrote:Dear Dave,



We have recently received your email via our website regarding the USB Fridge. We would like to take a moment and thank you for your purchase! We sincerely apologize for any inconvenience this product may have caused.

The wattage is 3.5-4W.

Thank you for your enquiry if have any inquiry regarding our USB products please feel free to contact us.

For the record, I never purchased one or even suggested as much.

Dave wrote: I'd like to know the wattage of your USB fridge please. Also is the body metal and does it possess any insulation. Thanks.