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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 22, 2025
Profile Activity
Topics: 17 / Replies: 2698
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RE: Roughly confirming ASHP sizing using existing heat data

Heat loss (and therefore the energy you need to supply) is proportional to (house temp - OAT). Note that the house continues to lose heat even if the...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

Sorry for not explaining the graph. Each point represents one day. The horizontal axis is the degree-days figure for the day (degree-days is a sligh...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Ideal Logic 10kW Heat Pump Pipes Noisy and Very Expensive to Run

If the halo has an inbuilt temp sensor (which I imagine it does, but check) then you can leave the control unit in the loft. The latter, or e...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

By 'flow' I presume you mean FSV parameter 2021. I am assuming you have left 2011 constant (at what value) As I mentioned earlier, consumption over...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Is My Midea Heat Pump Inherently Defective?

I haven't used named ranges either more than a couple of times previously, but I found following the formulae with eg d23^d22*d2/2 difficult to follow...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 4 port buffer tank connections

You have answered your own question, at least in part In addition the pumps either side often aren't balanced properly so you get mixing, resulting i...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Underfloor heating: Diagrams with COP 'per water flow'

Unless its 'out of range' I dont think it materially affects COP (directly) which is why you wont see it plotted. The essentials of water flow are ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 4 port buffer tank connections

Maybe With 6 fan coils you probably do need a volumiser (2 port buffer) because of low system volume, but fan coils alone aren't sofaik an argument ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 4 port buffer tank connections

Very likely better still if it looks like this:

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Smart TRV experiences (ideally integrating with Midea heat pump)

Thanks. That's what I had personally understood although I hadn't clocked that you call them FBVs (good idea btw!) @madbilly is trying to do someth...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Is My Midea Heat Pump Inherently Defective?

I think the energy balance model of setback I posted a few days ago (attached again) is not a bad approximation and certainly exhibits all of the qual...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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