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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 14, 2025
Profile Activity
Topics: 18 / Replies: 3364
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Reply
RE: Trying to work out COP

... If as a result you can turn the flow temp down then that could make quite a difference!

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Trying to work out COP

So your heating COP is (30-4)/(10.5-2.5) = 3.25 Your DHW COP is 4/2.5 = 1.6 As you imply sacrificing COP for low cost electricity saves money. Its...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New 5kW Samsung Gen6 heat pump owner with loads of questions

No process is 100% efficient, so yes some is lost from pumps, electronics, pipework etc. I think Vaillant monitor deltaT and flow rate to calculate e...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Trying to work out COP

Overall about 43/15 = 2.85 However this is made up of space heating COP and DHW COP, which normally are quoted separately, because they are typicall...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Trying to work out COP

It doesn't directly contribute. The energy in basically powers the compressor (plus a bit for other things) and the energy out is the heat in the ga...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss calculators and spread sheets

Here is the measured data (2 years worth of half hourly meter data) my selection was based on. You don't need 2 years worth and the 24, 12, 6,3 hour ...

11 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculators and spread sheets

I have done various thing, basically my approach was 'do a sensible and practical upgrade whenever a room is decorated or the opportunity arises'. Ov...

11 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculators and spread sheets

Assuming you actually heat the house (which, admittedly, it sounds like you may not fully) a gas consumption of 16kWh and a heat loss of 18kW are not ...

11 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

@mars - have you considered 'empty-chairing' the buffer tank advocate. It would send a very powerful message throughout the video without you having ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

That's a shame as I was looking forward to the fireworks, but as you say it's a strong message which needs to be heard.

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

That will be fun!

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Agree, and if there is a flow mismatch the question is 'why' and can it be eliminated using something without undesirable side effects. In most cases...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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