Re: Using LM56 to control heating element
- From: John Popelish <jpopelish@xxxxxxxx>
- Date: Sat, 28 Jul 2007 12:59:54 -0400
Hammy wrote:
I'm thinking of using the LM56:
http://www.national.com/ds/LM/LM56.pdf
My question is what is typically used as the heating element. I'm
planning on using it to switch in a heater when the temp drops below a
certain threshold and to switch it out when it hits another threshold.
The temp here in the winter time can hit below -20C not including the
wind chill. Is it possible (practical) to keep an enclosure a weather
tight (PVC) (1.25" x 4") at a minimum of say 10C under such
conditions? Or should I be looking at another device or method.
What I'm thinking of doing is like fig 7 of the application note on
the LM56.
The heater depends entirely on what must be heated and how well it is insulated. This thermostat could control the heat to keep your entire house warm, if the output relay was large enough and you were willing to pay for the power.
So lets start at the beginning. What are the dimensions of the enclosure?
What is it insulated with? Can you come up with an R value?
What waste (watts) heat is already being produced inside the enclosure?
What is the warmest and coldest ambient temperatures the package will be exposed to?
What are the temperature limits of the package?
Until you have gone through that list, you do not even know if you have a heating or a cooling problem, or both.
.
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