navitron
 
Renewable Energy and Sustainability Forum
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Anyone wishing to register as a new member on the forum is strongly recommended to use a "proper" email address - following recent spam/hack attempts on the forum, all security is set to "high", and "disposable" email addresses like Gmail, Yahoo and Hotmail tend to be viewed with suspicion, and the application rejected if there is any doubt whatsoever
 
Recent Articles: Navitron Partners With Solax to Help Create A More Sustainable Future | Navitron Calls for Increased Carbon Footprint Reduction In Light of Earth Overshoot Day | A plea from The David School - Issue 18
   Home   Help Search Login Register  
Pages: 1 2 3 [4]   Go Down
  Print  
Author Topic: Solar Thermal Production @ Courtiestown  (Read 8461 times)
daveluck_uk
Full Member
***
Offline Offline

Posts: 104


« Reply #45 on: March 22, 2019, 11:43:38 AM »

Richard, are your panels lower than the water you are heating and is the store open vented and is your hot water non direct? If it is you could go non sealed.

Remove all the pressure tanks and feed in loop. I've been running mine like that for a while now and have made it through the winter with no freezing issues and I've not had any air problems at all.
Logged
Iain
Hero Member
*****
Offline Offline

Posts: 1698


« Reply #46 on: March 22, 2019, 11:49:56 AM »

Hi Richard
Just for a comparison.
I have 20 x 65 mm tubes. My pump is on the lowest speed with variable speed control.
It starts on 40% of the low speed and only on a couple of occasions have I seen the speed raise to 90%.
Probably a silly question and probably been mentioned before.
I had problems at the start with air etc. I finally narrowed it down to the Expansion vessel. I comes prcharged to 3 bar. I run my system at 1 bar so there was nowhere for the expansion to go apart from the pressure relief valve. As the system cooled the volume reduced an therefore drew a vacuum and any weak area would let air in.
I reset my EV pre charge to 0.8 bar for a 1 bar system pressure.
Not had any problems since.
Is your EV set to the correct pressure?

Iain
« Last Edit: March 22, 2019, 08:03:07 PM by Iain » Logged

1.98kWp PV (11 x Sharp 180 and SB 2.5)
20 x 65mm Thermal and 180ltr unvented
Powervault 4Kw - G200 Lithium-Ion (LiFePO4)
9000ltr rainwater storage   Plymouth
linesrg
Hero Member
*****
Offline Offline

Posts: 1121



WWW
« Reply #47 on: March 22, 2019, 05:38:33 PM »

Iain,

My pump is also variable between 0 - 100% but the software allows the upper limit to be altered which is what I've done, so 100% = 4ltrs flow.

As I have posted previously I have allowed the installers to work on the system so far and thus I cannot answer your question. I am hoping that during the next leave I will get some time and the enthusiasm to start on the system and I'll be finding out what the current pre-charge pressure is.

Regards

Richard
Logged

1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
linesrg
Hero Member
*****
Offline Offline

Posts: 1121



WWW
« Reply #48 on: April 09, 2019, 05:36:11 PM »

Good Evening All,

Well we've had a nice sunny day here and I am genuinely pleased to report that the Solar ET continues to look like it is behaving itself.

I have attached a picture showing the system was 'pressurised' whilst operating this afternoon and I have witnessed it doing its panel cooling bit when the manifold gets to 120oC.

The EHS has had a lot of energy input via both the Immersun and the Solar ET and is currently sitting at 78oC which will get used later for domestic heating as the system demands.

Fingers crossed.

I do still intend lowering the expansion vessel.

Regards

Richard


* IMG_3005.jpg (117.81 KB, 1280x1087 - viewed 188 times.)
Logged

1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
linesrg
Hero Member
*****
Offline Offline

Posts: 1121



WWW
« Reply #49 on: April 29, 2019, 10:52:57 PM »

Good Evening All,

As the system went into something less than 100% functionality today I have finally decided to set about this system.

I have raised the pumping station a couple of inches and lowered the expansion vessel a similar amount.  I have no idea if this will have any impact but it is a start.  It also allowed me to discover that the installers found it necessary to secure parts to 19mm of plywood using 70mm screws.............. I can't say I'm surprised.

I've lashed together the garden sprayer and an old washing machine supply hose and injected a (small) quantity of fluid and circulated on two occasions.  At the end of the first session the pressure had dropped to zero but I have left it with about 0.8bar currently and will monitor the system as it bursts into life tomorrow.

I have also lowered the temperature at which the manifold cooling function cuts in.  It was 120oC and is now set at 100oC as this is the lowest setting available.

Next I need to work out how to check the current pre-charge pressure of the expansion vessel.

Regards

Richard

  
« Last Edit: April 30, 2019, 10:38:58 AM by linesrg » Logged

1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
Iain
Hero Member
*****
Offline Offline

Posts: 1698


« Reply #50 on: April 30, 2019, 06:35:43 AM »

Hi
Quote
.Next I need to work out how to check the current pre-charge pressure of the expansion vessel.
 

Just wait until your system pressure has dropped to zero (if it does again) and check the pressure in the EV with the Schrader valve.
Or just vent the system pressure away one evening, test the EV precharge, reset if required, and then recharge the system.
I run my system at 1 bar with a precharge of 0.8 bar.
Just have the precharge 0.2 bar below system pressure. (With a cold system)
When testing the precharge just ensure the is no system pressure to affect the reading.
Can you also see the outlet from the Pressure relief valve?, normally goes into a tun dish. On mine there was always a drip of water sitting  there, showing the PRV had been operating. My PRV  is a 3 bar one. I believe some are higher which allows a higher system pressure/precharge if required.

I have found 1 bar works fine though.

Iain
« Last Edit: April 30, 2019, 06:38:15 AM by Iain » Logged

1.98kWp PV (11 x Sharp 180 and SB 2.5)
20 x 65mm Thermal and 180ltr unvented
Powervault 4Kw - G200 Lithium-Ion (LiFePO4)
9000ltr rainwater storage   Plymouth
linesrg
Hero Member
*****
Offline Offline

Posts: 1121



WWW
« Reply #51 on: April 30, 2019, 08:59:06 AM »

Iain,

Thanks for this.

The system made lots of air related noises on start up this morning but, to be honest, I expected this.

I'm tiptoeing around this at the moment as I am simply unfamiliar. There is no rocket science involved I know but when you haven't even removed the rubber protection cap on an EV before.......

Next up is determining the best means of checking the pressure within from the equipment I have available or whether I need something more 'dedicated'.

I'm going to be in all day and will very closely monitor the system and intervene if required.

The good news is we aren't in a fault mode which is where we were yesterday at this time.

Late Extra - OK so the system is operating, after a fashion, but the EV has a pressure circa 1.6bar currently with a system pressure of around 0.2 - 0.3 bar. I'll need to leave it for now and look to bleed some pressure off the EV this evening.

Regards

Richard
« Last Edit: April 30, 2019, 10:37:42 AM by linesrg » Logged

1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
linesrg
Hero Member
*****
Offline Offline

Posts: 1121



WWW
« Reply #52 on: April 30, 2019, 11:44:42 PM »

Good Evening All,

I'm just back from some kayaking down the Don and dinner at the flat and launching myself at the Solar ET.

The system pressure is showing as zero on the Flowbox gauge and the temperature in the EHS only reached 61oC today so it was a stress free day as far as the system was concerned. The Immersun did't start diverting until around 11 o'clock and it got slightly cloudy later in the afternoon.

Enough of the burbling - I've just put a tyre gauge on the EV and it is actually showing 34psi rather than the 24psi I thought I saw earlier. This suggests the EV retains the pressure it was originally supplied with i.e. best part of 2.5bar?

I bled the EV down to 12psi which is near enough 0.8bar and I've pumped more fluid into the system and the Flowbox gauge is now showing 1bar and I'm circulating at 50% pump speed.

I have to go away for a few days so won't be able to closely monitor things - I'll just need to keep fingers crossed.

Regards

Richard
Logged

1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
Pages: 1 2 3 [4]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines
SMFAds for Free Forums
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!