Re: solar thermal pumps [RE-wrenches]
The best solution we have come up with for pumping PV direct through large collector arrays is the Dankoff SunCentric pump. It is a heavy duty pump running at low rpm, so it is long lasting. It runs directly off a PV array, with no controller. It can provide much more lift and flow than the HEH10 - up to 80 feet of lift and up to 70 gallons per minute - so it can meet a wide variety of applications, such as pool pumping, pool heating, hydronic heating for large floors, etc. When used with liquid over 140 deg F, it should be ordered with the "high temp option" which consists of a brass impeller and a high temperature seal.
Typical glazed flat plate collectors require about 1 gallon a minute per collector. For your array this will mean 6 gallons per minute at an as-yet-undetermined lift (determined by pipe size and run). The smallest SunCentric may be appropriate for your application, as it provides about 8 gallons per minute with ten feet of lift (about 70 feet of 3/4" pipe), using 100 watts of PV. You can consult the pump curves and spec sheets at:
http://dankoffsolar.com/waterpumps/specsheets/suncentric_solar/suncentric_solar_charts.html
Hope this is helpful!
on 8/18/01 10:24 PM, Kurt Nelson at sunwise@cheqnet.net wrote:
Greetings all (and Smitty?),
I'm doing a solar thermal system/in-slab hydronics, and though I have done a number of SDHW systems, I'm new to moving fluid through larger arrays.
The collector is 5 (possibly six), 4x8 Solar Kings ground mounted about forty feet from the house. I would like to run the pump(s) PV direct and it would seem that there is a shortage of pumps to choose from here. I was thinking two Hartel HEH-10's (did I get the model numer right) and would welcome other suggestions. Also, ....
1 - Is it best to plumb (pipes) them in series, or parallel?
2- Is it best to wire them each to individual 18-22 watt panels (my guess) or both to a single 38 to 44 watt panel.
3 - The burried and insulated piping from the array to the house.... go with 3/4 inch pipe (or even larger) to accomidate flow, or 1/2 inch to reduce heat loss from piping surface area AND the increased time the heat transfer fluid spends in the pipe?
Thanks in advance for thoughts and suggestions.
Kurt Nelson
SOLutions
- - - -
To send a message: RE-wrenches@topica.com
Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
List rules etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
Check out participant bios: www.mrsharkey.com/wrenches/index.html
Hosted by Home Power magazine
- - - -
To send a message: RE-wrenches@topica.com
Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
Check out participant bios: www.mrsharkey.com/wrenches/index.html
Hosted by Home Power magazine
Moderator: michael.welch@homepower.com
==^================================================================
EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9
Or send an email To: RE-wrenches-unsubscribe@topica.com
This email was sent to: michael.welch@homepower.com
T O P I C A -- Register now to manage your mail!
http://www.topica.com/partner/tag02/register
==^================================================================