I think i need a Thermal Dump !!!

[2ndBillericay]

Well, i have had my 2 panels installed for 2 weeks and i have noticed at noon to 2pm the tank reaches 60 degrees so the pump stops. My panel collector is going up to 150 degrees !!! While the supplier has said that is within the system tollerance i am a little concerned.

I elieve that i can fit a heat dump / radiator and wondered what stype peolpe had used and found worked best.

I thought of having a small finned rad connected by ducting to roof vents in the north side of the roof so when the tank temp hits 60 and the panels are at say 80 a 3 way valve diverts the water and turns on a fan then lettnig graviry circulate the water as it cools.

DL2 Time:  Thu Apr 07 12:24:34 +0000 2011
DeltaSol BS/DrainBack => DFA
  Temperature sensor 1:  146.6 °C = Panel water
  Temperature sensor 2:  59.6 °C = Bottom of tank
  Temperature sensor 3:  60.0 °C = Top of tank


Thanks

Richard

[dhaslam]

I think that a run of copper piping outside  would be better.   

[Baz]

If you can fit a temperature regulator on the output of the tank then you could have it go up to 90, thus giving a reserve for dull days. You will still need a heat dump though as if you are getting that hot this early in the year it will be steaming in July. While the systems are designed to cope with overtemperature daily exposure will shorten the life of plastic bits.

[2ndBillericay]

I have seen copper pipe with fins attached like a long fish skeleton, do you think someting like that would do ?

Should i put the pipe under some shade ? like a metal top hat to stop it from heating the water inside it ?

[Antman]

Don't throw away the heat - use it. You can reprog the Resol BS to keep loading the cylinder beyond 60.

As Baz says, fit a TMV (Thermostatic Mixing Valve) to limit the outlet temp to 60 degrees. You will need a high flow rate TMV for whole house use e.g. Horne Heatstat T2.

Regards

Antman

[greentangerine]

I load my cylinder to 95.  It came complete with a TMV (Gledhill Torrent Solar).  That said, it reached 93 yesterday!   84 so far today (and it started off this morning as 60 top, 32 bottom).

I'm also investigating a heat dump - current plan is to use 25m of 10mm soft copper piping routed somewhere.

[Baz]

feed your seasonal store

[2ndBillericay]

it looks like i will be plumbing a TMV this weekend :-)

thought i had done all the copper work :-)

[Baz]

Check out some of the other threads, TMV does need feed at a few degrees hotter than output and not sure what happens when feed is below this. Does it allow you to have a tepid shower? Also needs a bit of pressure differential so not good if feed tank is practically same level.