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Rob of York
@rob-of-york
Member
Estimable Member
Joined: Aug 25, 2026
Last seen: Oct 4, 2026
Profile Activity
Topics: 7 / Replies: 91
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Reply
RE: Adventures in heat loss calculations

Here is a further method of calculating heat loss, with thanks to @jamespa and @cathoderay for a lively discussion on another thread. (I've posted it ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Where heat loss surveys seem to go against practical reality

@cathoderay @jamespa I've managed to get some nice results myself based on data from Oct-24 to Mar-25. I will shortly put them in the thread below, ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Where heat loss surveys seem to go against practical reality

@cathoderay I think there is a reasonable argument to simply include the DHW heating in your values. The heat loss calculated will then be for the ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat Pumps Without Grants: Would You Have Installed One & Will You Now?

We had two heat pumps installed without Govt funding. However, they are not necessarily of the type that the poll was intending to ask about. We hav...

4 weeks ago
Forum
Government Schemes, Regulations, Training, Planning & Organisations
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RE: Where heat loss surveys seem to go against practical reality

Can you add up the energy used for DHW each day? If so then at least for the daily averages, you could get the total heat pump output across all hours...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

Posted by @jamespa Id be tempted to buy and splice in a cheap flow rate meter if I really wanted to be certain. I'll do exactly that, thanks. ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Where heat loss surveys seem to go against practical reality

@cathoderay If the heat pump occasionally over produces some extra heat and the indoor temperature rises accordingly, then that will be captured in ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Where heat loss surveys seem to go against practical reality

@cathoderay I have a suspicion that the minimum output of your heat pump may be a factor in the surprising result shown in your latest graph, regardin...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

@jamespa Thanks, its good to have a second opinion on this. I'm definitely in the (a) category of try it and see and only make changes to the pip...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Where heat loss surveys seem to go against practical reality

@cathoderay Thank you for trying out the simple heat loss calculation that I suggested, the "HTC method". You have some excellent detailed data, whi...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

@jamespa Thanks, you are right. I needed to look at this again. At worst the flow splits into two parallel 15mm pipe runs. I am convinced that as...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

@old_scientist If you fall below the minimum flow rate, most ASHPs will simply throw a flow rate error and switch off until the flow rate is increa...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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