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Author Topic: Combine GSHP to solar thermal, how?  (Read 2885 times)
roys
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« on: June 01, 2011, 09:43:37 AM »

Hi folks I have a friend that has just asked me this question or two, so I thought I throw it to the forum.

Presently has 3 solar hot water flat panels fitted on the garage connected to a twin coil hot 210L water cylinder in the house,  would like to install a groundsource heat pump in the garage (it is more convient for the ground loop in the garden.) he does not want to change the cylinder if possible and would like to use the solar coil in the cylinder for the heatpump.  2nd coil on the HWC is fed from an oil fired boiler.
 
Is there a groundsource heatpump manufacturer that manufactures a heatpump that has the facility to use the solar panels in conjunction with the heatpump or would I have to fit a 3 way valve that would select the heat source depending on which one was the hotter?

He currently has 15mm flow and return tubing from his solar panels on the garage to the HWC in the house. It is insulated and ran underground in purple ducting. Distance of the run is abot 20m. The current system works well, would he have to change the size of copper tubing to the house, what modifications would have to be done?

Sorry 3 or 4 questions at once.
Cheers Steve
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Eccentric Dyslexic
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« Reply #1 on: June 29, 2011, 06:41:31 AM »

Yes you can use to solar to assit a GSHP, i have done this using a 12 panel array used to heat the swimming pool in the spring, summer& autum.  If the pool is over 30c the controler heats the undergound loop for the heat pump, storing the heat for use later in the year to some extent and also boosting efficency if the pump kicks in and the sun is shining all year round.

Steve
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5KW PV, Immersun, 300l tank in UK. 2x20tube47mm panels with TDC3 & 2x 200l Tanks; 14kw Ground Source Heat pump for UFH.   12 x 20tube 58mm panels heating a 12m by 6m pool and the ground loop for the heat pump. ;-)
dhaslam
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« Reply #2 on: June 29, 2011, 12:04:07 PM »

It is possible to share the solar coil by using non return valves, in the appropriate place on all four pipes, and preferably  setting the heat pump timer so that it operates  outside the solar heating hours.    The pump on each return circuit  needs to be between the junction and the heat source, at least I think that is the way it works.       
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DHW 250 litre cylinder  60 X 47mm tubes
Heating  180,000 litre straw insulated seasonal store, 90X58mm tubes + 7 sqm flat collectors, 1 kW VAWT, 3 kW heatpump plus Walltherm gasifying stove
roys
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« Reply #3 on: July 23, 2011, 02:03:18 PM »

Thanks for the replies guys, sorry for the delay in replying I never saw them coming in.

Cheers Steve
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