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Search: Posts Made By: Robl
Forum: Geothermal & Heat Pumps 04-23-22, 05:09 PM
Replies: 2
Views: 315
Posted By Robl
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...
Forum: Geothermal & Heat Pumps 04-06-22, 01:48 AM
Replies: 11
Views: 1,022
Posted By Robl
I just looked up EER, SEER - as a UK person these...

I just looked up EER, SEER - as a UK person these terms have been on the edge of my consciousness for some time! We get COP and SCOP here. So:

COP (Coefficient Of Performance) is Power out /...
Forum: Geothermal & Heat Pumps 04-02-22, 03:31 PM
Replies: 16
Views: 3,246
Posted By Robl
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...
Forum: Geothermal & Heat Pumps 04-02-22, 11:42 AM
Replies: 16
Views: 3,246
Posted By Robl
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...
Forum: Geothermal & Heat Pumps 03-30-22, 09:48 AM
Replies: 2
Views: 286
Posted By Robl
If the HX (usually a Brazed Plate Heat Exchanger,...

If the HX (usually a Brazed Plate Heat Exchanger, BPHE) is inside the outdoor unit, then it is simpler to make gastight. Most domestic A2W systems in the UK are monobloc like this; They are cheaper,...
Forum: Introductions 03-30-22, 03:50 AM
Replies: 4
Views: 489
Posted By Robl
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...
Forum: Geothermal & Heat Pumps 03-21-22, 10:04 AM
Replies: 16
Views: 3,246
Posted By Robl
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,...
Forum: Conservation 03-08-22, 02:37 AM
Replies: 22
Views: 2,436
Posted By Robl
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...
Forum: Geothermal & Heat Pumps 03-06-22, 05:35 PM
Replies: 11
Views: 1,022
Posted By Robl
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...
Forum: Wind Power 03-03-22, 07:34 AM
Replies: 6
Views: 901
Posted By Robl
There's a company in the UK with smaller VAWTs,...

There's a company in the UK with smaller VAWTs, they have a video showing them retrofitted to lamp-posts on a motorway central reservation. I'm not sure if they have any in that location yet, but...
Forum: Wind Power 03-02-22, 04:06 AM
Replies: 6
Views: 901
Posted By Robl
There's probably a way of getting small amounts...

There's probably a way of getting small amounts of power, useful for some monitoring or similar activity. Think wearable technologies, or "energy harvesting" (google it) - there's all sorts of...
Forum: Geothermal & Heat Pumps 03-02-22, 03:49 AM
Replies: 10
Views: 1,450
Posted By Robl
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,...
Forum: Appliances & Gadgets 02-19-22, 02:29 AM
Replies: 10
Views: 4,442
Posted By Robl
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...
Forum: Geothermal & Heat Pumps 02-16-22, 09:28 AM
Replies: 16
Views: 3,246
Posted By Robl
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...
Forum: Geothermal & Heat Pumps 02-16-22, 07:00 AM
Replies: 16
Views: 3,246
Posted By Robl
The propane was pure, just R290 - in fact just...

The propane was pure, just R290 - in fact just search R290 in ebay. I got it from ebay uk, they called it: "Embraco compressor R290 gas 370 GRAM REFRIGERANT CANISTER CYLINDER BOTTLE"

The...
Forum: Geothermal & Heat Pumps 02-07-22, 09:05 AM
Replies: 16
Views: 3,246
Posted By Robl
I found an online manufacturers BPHE calculator...

I found an online manufacturers BPHE calculator tool, here:

https://www.heat-exchangers.uk/online-calculator/

The way you use it is to enter the inlet and outlet temps that you want (all 4...
Forum: Geothermal & Heat Pumps 01-31-22, 06:44 AM
Replies: 10
Views: 1,450
Posted By Robl
I have come across something similar. That is, I...

I have come across something similar. That is, I have a 600W electrical, 2.4kW thermal, ground sourced heat pump with 180metres of pipe buried in our back garden. Initially the pipe just had water...
Forum: Geothermal & Heat Pumps 01-23-22, 10:30 AM
Replies: 16
Views: 3,246
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, 02:21 AM
Replies: 16
Views: 3,246
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, 10:04 AM
Replies: 16
Views: 3,246
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, 10:21 AM
Replies: 16
Views: 3,246
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, 05:57 AM
Replies: 16
Views: 3,246
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, 08:17 AM
Replies: 575
Views: 806,581
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, 01:11 AM
Replies: 575
Views: 806,581
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, 07:40 AM
Replies: 16
Views: 3,246
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...
Showing results 1 to 25 of 29

 
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