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Solar collectors plumbed Parallel vs. Serial - Page 2

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Posted by Nolan Tucker on October 21, 2004, 12:20 am
Thanks to all.  I am new to maintaining my own system and learning a lot
thanks to you guys.

"Bert Menkveld" <bertATreentronicsDOTcom> wrote in message




Posted by Nolan on October 21, 2004, 12:10 pm
Hi Bert-
    What type of valve would I ask for?  This valve would not increase the
resistance/load on the pump?

"Bert Menkveld" <bertATreentronicsDOTcom> wrote in message




Posted by Bert Menkveld on October 27, 2004, 10:48 pm
 Hi Nolan,

Well, you may not want to add any flow restriction, unless you have a good
reason for wanting less but hotter water.

If you do need to restrict the flow, any kind of valve you can get at your
local hardware store will do.  Plumbing it in series with the pump will
allow you to adjust flow rate.  For a typical centrifugal pump there is no
harm in restricting the flow this way.

If you have a fixed displacement pump (unlikely?), then you would have to
plumb the valve in parallel with the pump and open the valve slightly to
partially "short-circuit" the fluid flow.

Bert Menkveld

Posted by Gary on October 17, 2004, 5:08 pm
 Nolan Tucker wrote:

I think that you will probably be better off with the parallel

It is by far the most common arrangement used for Domestic Hot Water

I think that if you hook the two panels in series the summer
temperatures out of the 2nd panel may be much more than you want, and
possibly to too high for the health of the system.

As is pointed out above, the efficiency of the 2nd panel in the series
arrangement will suffer -- you would get higher temperatures, but less
hot water.  i.e. the product of (Volume of water heated)*(Temperature
rise) will be less for the series connection.

If you are using the system just for Domestic Hot Water heating, two
4' by 12' panels should produce a lot of hot water.  If they don't, I
would look into all the basics, like orientation and tilt of the
panels, shading, chronic awful weather conditions, system flow rates
or controller not set up right ...


Posted by Gary on October 18, 2004, 5:23 pm

There is a troubleshooting checklist here:



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