[Hai-users] Sun sensor

[Ray Manning]

Couldn't you place one water temperature sensor at the exit of the collector
and one in the pool and run the pump when there is some minimum delta? Or
perhaps you're thinking the gained heat may be disipated between the exit of
the collector and the entry into the pool? I'd agree that the problem get's
much more difficult to solve if you try to take that heat loss into
consideration, but I'd think an increase in the delta to overcome the heat
disipation returning to the pool would suffice.

- Ray

-----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 5:05 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:
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-----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
> > http://romaine.tssi.com/mailman/listinfo/hai-users
>
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