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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 21, 2025
Profile Activity
Topics: 17 / Replies: 2698
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RE: help sizing rads based on room by room heat loss

Have you got the loss calculations, if so perhaps you could post?

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: help sizing rads based on room by room heat loss

The output of a rad is proportional to DT to the power 1.3, where DT is the average temperature difference between rad and room. At a flow temperatu...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

Just to clarify this was a serious question, its going to be easier to explain your observations above if you have plots. If you dont then just say a...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

Ok on second thoughts scrub the questions. Id be tempted to optimise the rads as previously described. If you find that this results in a rad curve ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

Ok. When you say max 50 what changes it? Does it in practice run at 50 and if so does the zone valve switch it on and off? Basically I'm trying to...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

@rhh2348 have you got graphs to illustrate this, if so can you post them please (or were you sitting and watching?)

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

@tomdad How is it all connected/controlled. The heat pump can only produce water at one temperature at any one time, so either it's all running at...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Bathroom Radiator replacement

Yes. Just find any radiator catalogue eg myson or stelrad and look it up. This will give you W at a DT of 50C between flow temp and room. To conver...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

The radiator output at any given ft will increase if the radiator is larger. So larger rads will translate to lower ft (for the same house temperatur...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

@tomdad Here is some more detail. Firstly your heat pump is capable of operating at 55 or 35 or anywhere in between and indeed for a bit either si...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Bathroom Radiator replacement

Thats the main consideration. You need to calculate btu or kW at your design flow temperature and compare with the room heat loss. Towel rails emit...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

The point to understand is that cycling basically occurs because the heat demand from the house is less than the minimum that the compressor can produ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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