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william1066
@william1066
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Estimable Member
Joined: Jan 5, 2023
Last seen: Feb 13, 2024
Profile Activity
Topics: 0 / Replies: 206
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RE: 14kW Daikin Altherma HP, UFH: struggles to maintain delta T at LWT < 39-38 degrees Celsius

One of my [many] knowledge gaps. What is the right delta T? Should I vary this? If so, what are the parameters that should drive these changes? I ...

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

I found additional material for that journey here. "...Scroll compressors with continuous modulation can adjust from 10 to 100 percent capacity (or v...

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

@frappzy I can do the same on my. Mine is rated at 16kW. When I was "playing around/fine tuning" the flow temp and delta T I ended up with this [s...

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

I have been looking into this as well. I think this may have something to do with the capabilities of the inverter on the pump. From what I could fi...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Our Grant Aerona R32 13kW ASHP installation

@allyfish I have this quandry as well. Is the additional wear and tear on the heat pump more or less in $$ than the electricity cost on the cheap rat...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air source heat pump problems - NIBE F 2040 ASHP

@rickk54 While I am new to heat pumps (just installed 16kW Samsung Gen6) - what I have learnt is that the carnot equation only has 2 parameters (Tem...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Daikin monobloc energy usage

You should be able to video it frosted up. And if you monitor your flow temp, you should see a defrost cycle. My heat pump takes 3-4 mins to defrost....

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump delta T too low - 2c

@derek-m Exactly, I had this formula for UFH, though not sure it is correct but seems to give results in a reasonable ball park. In any case the resu...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: GSHP running UFH but no feedback loop yet.

@alistersmith I think it is important to get some basic monitoring in place [if you don't have it yet]. You don't need fancy stuff, but at least flow...

3 years ago
Forum
Ground Source Heat Pump (GSHPs)
Reply
RE: Heat pump delta T too low - 2c

Of course, I should have been clear, I need to accurately know the dT with much more accurate sensors, but it was more to illustrate the point that mi...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump delta T too low - 2c

@derek-m Yes, the flow rate "meter" in the pump is done via fancy calculations by the pump electronics. So probably some "fancy" filtering going on a...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Low COP on Samsung 16kw Gen6

For now off the controller UI, manually put it in a spreadsheet. I have installed the modbus adapter in the unit outside, just not had a chance to co...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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