Forum: Geothermal & Heat Pumps
04-23-22, 05:09 PM
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Replies: 2
Views: 315
Hi, great project!
From your description, I...
Hi, great project!
From your description, I understand your gas boiler has an internal pump - hence you need another for the heatpump. You intend to convert the A2A unit to a split A2W unit I...
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Forum: Geothermal & Heat Pumps
04-06-22, 01:48 AM
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Replies: 11
Views: 1,022
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Forum: Geothermal & Heat Pumps
04-02-22, 03:31 PM
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Replies: 16
Views: 3,246
Looking harder at the compressor datasheet, it...
Looking harder at the compressor datasheet, it has 3 possible starter configurations. And one of them is slightly higher efficiency - not a lot, but I'm chasing anything I can get here! This new...
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Forum: Geothermal & Heat Pumps
04-02-22, 11:42 AM
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Replies: 16
Views: 3,246
I have tried an addon beefy 200J 10R NTC to...
I have tried an addon beefy 200J 10R NTC to decrease the startup inrush, to prevent my fuse from blowing again. And the behaviour was really not what I would have predicted. I actually have 2...
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Forum: Geothermal & Heat Pumps
03-30-22, 09:48 AM
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Replies: 2
Views: 286
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Forum: Introductions
03-30-22, 03:50 AM
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Replies: 4
Views: 489
We are in a similar position. We have 4kWp of...
We are in a similar position. We have 4kWp of solar, and I'd like to add more, but we can't export more than 16A (just under 4kW). I think one solution for us is to use battery storage with a...
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Forum: Geothermal & Heat Pumps
03-21-22, 10:04 AM
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Replies: 16
Views: 3,246
After about 100 days of operation, and around...
After about 100 days of operation, and around 2000 startups, the 5A input fuse blew. The compressor takes a lot of current on startup, almost 30A peaks(pic), and I calculated an I2t of around 65A2s,...
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Forum: Conservation
03-08-22, 02:37 AM
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Replies: 22
Views: 2,436
External heat sources like monobloc ashp, or...
External heat sources like monobloc ashp, or pipes that might freeze up, could be protected from frost damage with an anti freeze valve. Its just a valve at the lowest point in the plumbing, that...
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Forum: Geothermal & Heat Pumps
03-06-22, 05:35 PM
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Replies: 11
Views: 1,022
Agreed! I am not an expert, sorry, but I...
Agreed! I am not an expert, sorry, but I understand just enough to be dangerous.
All normal heatpumps use a closed loop system with a compressor, condensor, pressure drop, evaporator. The working...
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Forum: Wind Power
03-03-22, 07:34 AM
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Replies: 6
Views: 901
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Forum: Wind Power
03-02-22, 04:06 AM
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Replies: 6
Views: 901
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Forum: Geothermal & Heat Pumps
03-02-22, 03:49 AM
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Replies: 10
Views: 1,450
I think the advantage is that there's less...
I think the advantage is that there's less surface trenching needed than with lots of boreholes spread around your garden - you can usefully drill several shallow angled boreholes from one location,...
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Forum: Appliances & Gadgets
02-19-22, 02:29 AM
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Replies: 10
Views: 4,442
There is a huge variation in the performance of...
There is a huge variation in the performance of soldering irons, the better ones now having temperature feedback - so they can hold the tip at a programmed temperature. I have a second hand one by...
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Forum: Geothermal & Heat Pumps
02-16-22, 09:28 AM
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Replies: 16
Views: 3,246
I started off with a fire extinguisher that...
I started off with a fire extinguisher that somebody gave me. Don't do that though, it was a mistake on my part - there's all sorts of other rubbish in fire extinguisher gas, so it doesn't...
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Forum: Geothermal & Heat Pumps
02-16-22, 07:00 AM
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Replies: 16
Views: 3,246
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Forum: Geothermal & Heat Pumps
02-07-22, 09:05 AM
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Replies: 16
Views: 3,246
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Forum: Geothermal & Heat Pumps
01-31-22, 06:44 AM
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Replies: 10
Views: 1,450
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Forum: Geothermal & Heat Pumps
01-23-22, 10:30 AM
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Replies: 16
Views: 3,246
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...
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Forum: Geothermal & Heat Pumps
01-04-22, 02:21 AM
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Replies: 16
Views: 3,246
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...
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Forum: Geothermal & Heat Pumps
01-03-22, 10:04 AM
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Replies: 16
Views: 3,246
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...
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Forum: Geothermal & Heat Pumps
09-12-21, 10:21 AM
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Replies: 16
Views: 3,246
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...
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Forum: Geothermal & Heat Pumps
09-10-21, 05:57 AM
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Replies: 16
Views: 3,246
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...
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Forum: Conservation
07-26-21, 08:17 AM
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Replies: 575
Views: 806,581
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Forum: Conservation
07-22-21, 01:11 AM
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Replies: 575
Views: 806,581
We have a commercial mvhr which gives good...
We have a commercial mvhr which gives good efficiency of 90%. It’s got plastic sheets as the counterflow heat exchanger, as they're more efficient than metal. The fans are dc speed controlled. ...
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Forum: Geothermal & Heat Pumps
07-20-21, 07:40 AM
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Replies: 16
Views: 3,246
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...
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