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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 13, 2025
Profile Activity
Topics: 17 / Replies: 2131
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Reply
RE: ASHP Retrofit in a 2015 house with 10mm radiator tails

@alistairgbarron - sorry, I see now that you are already well ahead of the game on the calculations. I also got a bit confused by the thread/post re-a...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How many installers do you think have heat pumps at home?

Then the next even more interesting question might be: "Would you still have installed a heat pump if you hadn't been bribed sorry 'incentivised'?" Th...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP Retrofit in a 2015 house with 10mm radiator tails

Indeed. A good rule of thumb is a ASHP with a highish leaving water temperature (say 50 degrees, which means a delta t (difference or delta, between w...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Measuring your COP

To which I might add, if you aim low enough, sooner or later you will shoot yourself in the foot. That is what sooner or later the industry will find ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Measuring your COP

@julianc - thanks. I agree, but perhaps more often than not, there isn't a real engineer directly involved. My system was in effect designed by ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Measuring your COP

That's not the same thing, as your comment makes clear: the 35, 40, 55 etc are arbitrary vaguely ordinal numbers (could just as easily be 3 4 and 5 or...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Measuring your COP

Normally this forum is an excellent example of what a forum (forum: a place where people can exchange opinions and ideas on a particular issue) should...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Measuring your COP

@julianc - yes, I had all the calculations assumptions etc, room by room and total heat loss at -2 outside/design temps inside, and the problem is tha...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Measuring your COP

@oswiu - this is something that has come up before (Ecodans having better low temperature performance than Midea units). This is precisely why I sugge...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Measuring your COP

I agree. I have previously suggested that as it currently operates, MCS is a waste of space. At the very least, they could add realistic ie cold weath...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Real world COP vs. manufacturer claim

Very good, I think that will be a hard one to beat!

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Connecting to Midea MSmartHome using a PC

Using @derek-m's formula and my numbers for the last hour, I get (23.3 x 60 x 5)/1167 = 5.99kWh, giving a COP of 2.995 (3 decimals places not because ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Page 161 / 179
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