Originally Posted by eggs
Hey, am thinking of putting something like this together. I'd like to put it in a toolbox or something similar. Assuming I used the same materials as you, do you think there is any chance I could get away with the heating pipes in the same small enclosure (thinking a 24"x9"x9" aluminium box) as the PID controller and the SSR? Or does the system, even well insulated, still just put out too much heat to operate in an enclosure with temperature sensitive electronics?
Thanks for the thread.
When the mash is circulating, the tubes remain roughly at the temp of the exiting liquid, and significantly lower that than the temp of the exiting liquid on the outside of the insulation (I can put my hand on the outside of the insulation for as long as I like).
However, once the liquid stops circulating the temp rises quickly and the carry over heating can be significant. I am controlling the system by measuring the temp of the mash exiting the mash tun. If a sensor is placed at the entry of the tubes it might keep the over shoot in check.
You could put a reset-able thermal breaker in the case, one which would trip if the enclosure gets above the working temp of the PID.
I have thermal fuses in the box to make sure it never gets hot enough to cause a fire.