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Search: Posts Made By: Robl
Forum: Geothermal & Heat Pumps Yesterday, 11:30 AM
Replies: 7
Views: 1,636
Posted By Robl
6 week update: We have had a colder spell...

6 week update:
We have had a colder spell here, and the heatpump has been working for longer periods. After running constantly for about 10 hours in the morning a week ago, it tripped out on...
Forum: Geothermal & Heat Pumps 01-04-22, 03:21 AM
Replies: 7
Views: 1,636
Posted By Robl
Hi Toby! Carnation WA seems a very similar...

Hi Toby! Carnation WA seems a very similar climate to Cambridge Uk, but with a lot more rain in winter which is good for gshp as it makes the ground more conductive. I recommend looking at the doc...
Forum: Geothermal & Heat Pumps 01-03-22, 11:04 AM
Replies: 7
Views: 1,636
Posted By Robl
I've just about finished my ground-source...

I've just about finished my ground-source heatpump project, it's installed and been running well for the last 3 weeks here - it provides all the heating for our house now, and the gas boiler has been...
Forum: Geothermal & Heat Pumps 09-12-21, 11:21 AM
Replies: 7
Views: 1,636
Posted By Robl
I've run the rig a few times now logging data,...

I've run the rig a few times now logging data, and analysed the data a bit better now, taking into account losses of the 27litre water tank to air - I did this by only running the circulation pump...
Forum: Geothermal & Heat Pumps 09-10-21, 06:57 AM
Replies: 7
Views: 1,636
Posted By Robl
I finished the heatpump build, pressure tested...

I finished the heatpump build, pressure tested with CO2, vacuumed it & filled it with propane, then turned on the heatpump for the first time yesterday!
I charged it with the pump on, aiming for...
Forum: Conservation 07-26-21, 09:17 AM
Replies: 575
Views: 741,550
Posted By Robl
Continuing describing the system we have, in case...

Continuing describing the system we have, in case it's helpful:
It's a Vent Axia Sentinel Kinetic Plus BH unit, which was the biggest I could fit through the loft hatch. Bigger meaning it runs...
Forum: Conservation 07-22-21, 02:11 AM
Replies: 575
Views: 741,550
Posted By Robl
We have a commercial mvhr which gives good...

We have a commercial mvhr which gives good efficiency of 90%. Itís got plastic sheets as the counterflow heat exchanger, as they're more efficient than metal. The fans are dc speed controlled. ...
Forum: Geothermal & Heat Pumps 07-20-21, 08:40 AM
Replies: 7
Views: 1,636
Posted By Robl
DIY W2W heatpump

We now have a relatively well insulated house in the UK, needing a peak of 1.5kW over the last year to keep it warm in the coldest of weather. That would be 1.5kW of heat continuously on for 24hours...
Forum: Solar Power 10-31-20, 07:03 PM
Replies: 15
Views: 4,618
Posted By Robl
Wiring dc smps power supply inputs in series is...

Wiring dc smps power supply inputs in series is unlikely to work. Maybe if they were identical and designed for it, but its a recipe for a bang I fear. Any mismatch, and one of them would get all...
Forum: Solar Power 10-31-20, 11:48 AM
Replies: 15
Views: 4,618
Posted By Robl
Hi Barrowman - we're in the UK too, got our 4kWpk...

Hi Barrowman - we're in the UK too, got our 4kWpk solar 6 years ago. I still have the paperwork - we have 2 strings of 10 "Kinve" panels, each panel max power is at 36V*5.5A, and 45V peak, so each...
Forum: Solar Power 10-30-20, 07:19 PM
Replies: 15
Views: 4,618
Posted By Robl
I can see a few issues: If you get a feed in...

I can see a few issues:
If you get a feed in tariff (as it's the UK), they won't like you messing with the DC from panel to inverter. You could inject DC here, and "make" money!
Normally a 2kW...
Forum: Biofuels 10-30-20, 04:37 AM
Replies: 20
Views: 27,202
Posted By Robl
I’ve looked with interest at the heatgreen...

I’ve looked with interest at the heatgreen compost system 3a. It does look very impressive - I do wish there was an open forum available at its site, for others to discuss builds and issues. It...
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