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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 19, 2025
Profile Activity
Topics: 17 / Replies: 2696
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

15% or more typically The problem is not loss of energy (which as you say is small) its reduction in flow temperature to the emitters (due to the mi...

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

Pretty much that, basically (1) make sure that the fabric model represents the actual fabric and (2) adjust the ACH to fit measured loss. Here is th...

6 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

As long as they follow the weather compensation I wouldn't worry for now, You probably won't want room influence anyway. If they aren't following th...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

3 times per hour is reasonable. Are you sure it isn't doing defrost rather than cycling because of overcapacity?

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

@lakey Do you have half hourly or daily readings and what was the heating pattern. Basically my ashp was sized on gas meter readings and the fabric s...

6 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Twin 10kw Grant Aerona Volumiser Tanks using lots of power

Thats the only logical explanation because for their main function they emphatically dont. Could be, then once he had received them he realised t...

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

I remember thats where you started (conservatism in heat loss). What do you actually know in total about heat loss. Do you have any consumption fig...

6 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

Once its running at lowest possible FT you might be able to reassess the operating mode when its mild. Depending on your house, when its mild (which ...

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

Fair enough. Obviously you understand that you will take a running cost hit but all designs are a trade off. 45 is often a good compromise for radia...

6 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Twin 10kw Grant Aerona Volumiser Tanks using lots of power

I still am not sure you get the point of volumiser tanks. They add water volume to the system. They don't need power. Grant and others take the op...

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

Are you saying your design flow temperature (at the lowest oat) for the ashp system is 55C? Fans on fancoils do run constantly, but with a decent...

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

I'm sorry but I don't understand your maths. If you need 2.4-3kW output then you will need a radiator rated for about 6kW at 50C DT. That's a very bi...

6 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
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