Hamilton Beach sells a wine bottle cooler using this technology. It costs a=
bout $70 US. It has a 12 vdc external power supply rated at 7 amps. I looke=
d at the inside and there was a large heat sink and fan. Might be worth buy=
ing and dissecting!!

Sent from my iPhone

On Apr 11, 2011, at 10:01 PM, RussellMc <apptechnz@gmail.com> wrote:

>> The op wants a temperature control and doesn't care about efficiency, so
>> just run the Peltier at 12V until you reach the temp, and then turn it
>> on again every time the temp rises a bit.
>=20
> While intuitively OKish, this is bad in practice.
> It will produce the desired cooling result, but this thermally cycles
> the Peltier device and leads to substantial lifetime reduction due to
> thermal stresses .
>=20
> PWM (also mentioned) is notionally less efficient, as also mentioned.
> Add a series inductor and a catch diode and you have a buck regulator
> (or an RL filter depending on where you are looking in from) with
> goodish efficiency compared to optimum.
>=20
> Even mild and/or partial insulation of cup from ambient will greatly
> aid coolth availability.
>=20
>=20
>     R
> --=20
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>=20

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