[Hai-users] Sun sensor

[Dan Barclay]

The collector side wouldn't need to be in the water cycle (and really
shouldn't be).  It just needs to show heat absorption.

The water side would need some thought.  If you need to run the pump for
that, yea, you'd need to cycle the pump.  Using ambient (pipe) temp when the
pump is off may not be such a problem.  You could experiment with that I
think.

Dan

> -----Original Message-----
> From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
> Behalf Of Brett Griffin
> Sent: Monday, May 09, 2005 7:05 PM
> To: hai-users at tssi.com
> Subject: RE: [Hai-users] Sun sensor
> 
> Actually, the challenge of using delta temperatures requires the pump to
> operate.
> 
> Turning the system off will be the easy part.  When the delta is zero;
> shut
> the pump off.
> 
> You would have to write a program to run the pump for maybe for 5 minutes
> to
> determine if the system is creating a positive temperature differential
> (delta).  You may have to write the program to check every hour or so
> until
> the solar heater is doing its job.
> 
> There are photo cell that work with HAI, but they only determine night and
> day, and not how bright the day is.  To do that I would expect you will
> need
> a computer program to do this efficiently.
> 
> Brett Griffin, Technology Consultant
> 
> Archi . tech . tronics, Inc.
> high performance technology planningT
> p. (610) 825.7018 f (215) 827.5484
> 
> **top 10 reasons to use Architechtronics, Inc. for your next project:
> http://www.architechtronics.com/top10.html
> (Website optimized for PPC and Smartphones)
> 
> -----Original Message-----
> From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
> Behalf Of Dan Barclay
> Sent: Monday, May 09, 2005 6:41 PM
> To: 'Justin Matlock'; hai-users at tssi.com
> Subject: RE: [Hai-users] Sun sensor
> 
> Actually, let me make a minor correction to that.  Instead of comparing
> the
> temp to ambient, you need to compare it to the water temp.
> 
> Dan
> 
> > -----Original Message-----
> > From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
> > Behalf Of Dan Barclay
> > Sent: Monday, May 09, 2005 5:25 PM
> > To: 'Justin Matlock'; hai-users at tssi.com
> > Subject: RE: [Hai-users] Sun sensor
> >
> > Justin,
> >
> > You may want to consider triggering off temperature differential
> instead.
> >
> > If you measure temperature of something near the collectors that has
> about
> > the same absorption, you should be able to tell when you have a positive
> > energy flow by comparing that temp with ambient temp.  If you're getting
> a
> > temperature rise on the target, compared with ambient, you'll be getting
> > heat from the collectors.  A small section of collector should be good
> for
> > this.
> >
> > No, I haven't done it.  Just suggesting it as an engineer.
> >
> > Dan
> >
> >
> > > -----Original Message-----
> > > From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com]
> On
> > > Behalf Of Justin Matlock
> > > Sent: Monday, May 09, 2005 4:15 PM
> > > To: hai-users at tssi.com
> > > Subject: [Hai-users] Sun sensor
> > >
> > > Anyone out there have a recommended source or part for a sun sensor?
> > >
> > > I need something that will activate when the sun is actually shining,
> > and
> > > deactivate when it's not.  I have solar collectors on my roof for
> > heating
> > > my
> > > pool, and the only time I want them to have water flowing is when the
> > sun
> > > is
> > > actually shining -- otherwise, the collectors end up cooling the pool
> > > down.
> > >
> > > I already control the pump system using a standard 220v X10
> controller,
> > > and
> > > want to use the OP2 to control the valves (12v) that divert water to
> the
> > > collectors.  Simple enough.
> > >
> > > I was thinking I could get a small electric solar cell and connect it
> > (in
> > > some way) to a relay that will only throw when a certain voltage is
> > > produced
> > > by the solar chip.. But I have no idea how to go about wiring that up.
> > >
> > > Thanks;
> > > Justin
> > >
> > >
> > > _______________________________________________
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> > > HAI-users at tssi.com
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> >
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