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robl
@robl
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Honorable Member
Joined: Mar 23, 2022
Last seen: Sep 3, 2025
Profile Activity
Topics: 1 / Replies: 203
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Reply
RE: Heat pump delta T too low - 2c

@william1066 I think that you're right - dropping the LWT always improves the COP of the compressor. The DeltaT is pretty much irrelevent to the c...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Had to replace my GSHP due to new regulations with an ASHP

Groundsource is usually a lot simpler - a lot of them are just simple on/off things just like an old fridge, controlled by relays and thermostats. Th...

3 years ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

@murchison2003 Our heatpump is tiny. It takes 1800W from the ground outside, using 600W of electricity. So that 1800W from outside over 200m (30m...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

@derek-m It is gshp yes! 230m of pipe buried in the back garden, 800mm down. Had it for just over a year, all good so far:-)

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

@derek-m Cheers, I’ve obsessively been insulating for years, I need a new hobby! @kev-m It’s actually LWT-Tgroundwater. Not that it makes a h...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

Our heatpump has been going for 13 months, used 1580kWh of electricity, and produced 5803kWh of heat. Most of that is heating the (4 bed 1963 build) ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

I started by cable tying temp sensors to pipes, and wrapping with loads of insulation, re-wrapping, getting a different answer... There is no doubt i...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

In my experience, the temperature is much harder to monitor accurately enough than the flow rate. We need two sensors well connected to the flow and ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

@iancalderbank The flowmeters I use are cheapie £8 things that look like this from Amazon, which claims 2%. I have two, one on the house circuit m...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

@derek-m The sensors are tsic506f, and they connect up to an mbed(old micro type I’m used to) that I programmed with a free Arm account. There’s a...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A Beginner's Guide to ASHP Monitoring

I used a couple of 0.1C accurate temperature sensors for flow and return - they’re pushed into thin copper tubes which are thoroughly soldered to the ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Double or Triple Glazed Windows?

We changed the glass in our circa 1990 uPVC windows 11 years ago. The double glazing units that were in were the standard of the time: 4mm glass/16mm...

3 years ago
Forum
Insulation
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