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Search: Posts Made By: Robl
Forum: Geothermal & Heat Pumps 04-02-22, 03:31 PM
Replies: 16
Views: 31,394
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: 31,394
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 03-21-22, 10:04 AM
Replies: 16
Views: 31,394
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: Geothermal & Heat Pumps 02-16-22, 09:28 AM
Replies: 16
Views: 31,394
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: 31,394
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: 31,394
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 01-23-22, 10:30 AM
Replies: 16
Views: 31,394
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: 31,394
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: 31,394
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: 31,394
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: 31,394
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: Geothermal & Heat Pumps 07-20-21, 07:40 AM
Replies: 16
Views: 31,394
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...
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