[Hai-users] Sun sensor

[Larry Rappaport]

On Mon, 9 May 2005 20:35:55 -0500, you wrote (with possible editing):

>That would do it, but when the pump is running the temps may get pretty
>close.  If so, it may cycle the pump on and off if you try to recover heat
>when solar heating is low (but still available).  It will certainly work
>well when it's putting out a lot of heat.  It may cycle when it's recovering
>real heat, but not a lot.
>
>By comparing with something outside the control loop you can avoid the
>cycling.
>
>Dan

That might be handled fairly easily by building a bit of hysteresis in
the controller.  I.e. on when (t1 - t2) > 5, off when (t2 - t1) > 2 or
some such.
--

Larry
Email to rapp at lmr dot com