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Frappzy
@frappzy
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Active Member
Joined: Jan 25, 2023
Last seen: Jan 26, 2023
Profile Activity
Topics: 1 / Replies: 7
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Reply
RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

I opened the valves on the actuators (white valves in the picture). This was to have an open system for the pump to heat the whole house at once. Orig...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

Is there any reason to believe changing the delta T to 3 when it's milder outside is detrimental? I guess the trade off is possibly a circulation pump...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

Yes it might be this asas I have never seen the pump go below 10l/min, which for a delta T of 5 that means 3.5kW. But then I do not understand why I c...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

Does this mean that a smaller, 9kW heat pump can avoid cycling simply because it is "allowed" to have lower flow rates? If mine cannot go, say, below ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

Thank you for your explanation, I will need to think about this. Because I am still struggling to understand this point. Why would an oversized heat p...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

Ah, that's what I feared. Why did they have a clearly oversized heat pump installed? That sounds counterintuitive as more costly to run. But wha...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

@derek-m 3-bed semi detached, about 100 square metres. The MCS document says something like "Room specific heat loss 40-60W/m2" which I have no idea w...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius
3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 17
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