Help with Peltier modules 1

[Syncro5]

Hi all,

I'm somewhat of a novice with electronics but I am currently designing a system which needs to heat 2l of liquid up to 64°C for a short time (around 2 min) and then quickly cool it to below 7°C.

Is it possibe to use peltier modules for both aspects of the system, heating first and then reversing the current to immediately cool?

If so say we are opperating from an ambient temperature of 20°C. Would a Peltier module with a Delta T of 90°C mean the hot side increases to 65°C (ambient of 20 + 45) and the cold side decreases to -25°C (ambient of 20 - 45).

Any info on the matter would be greatly appreciated!

Thanks,

Joe.

 

[VEBill]

Inside any $250 dehumidifier you'll find a mechanical refrideration system with both a cold side and a hot side. I don't know the temperature spread, but they can ice up under some conditions. Any good refrigeration technician could help you customize the physical arrangement (e.g. longer piping). In summary, if this is a one off project, a refrigeration technician might be very helpful.

 

[itsmoked]

syncross; Yes! That's what I meant. While it may seem like the mechanical 'method' is bigger and bulkier, it's really not. They have all different sizes and capacities available. They're also completely understood and you won't end up trapped and requiring 'invention'.

A Peltier can have some tough issues associated with them. Peltiers have strict physical demands that make them hard to use. They also work via electrons directly transporting the heat. Hence, the systems depend directly on the quantity of electrons. That means large currents, which in turn, means small voltages. The power supplies that are required to supply low voltage large currents are inefficient and expensive.

Keith Cress
kcress -

http://www.flaminsystems.com