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william1066
@william1066
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Joined: Jan 5, 2023
Last seen: Feb 13, 2024
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Topics: 0 / Replies: 206
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RE: 17kw Grant Aerona heat pump not performing

"leaving water temperature" aka flow. Regarding your second question TLDR response: Where the heat load @ -2 degC outside is < 100W [concrete/t...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: 17kw Grant Aerona heat pump not performing

I am in the process of doing it. Completed the bathroom (150mm spacing with 16mm pex al pex pipes) and the kitchen/dining (100mm spacing, topped with...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: 17kw Grant Aerona heat pump not performing

Definitely my experience when I had a brief test manually controlling the LWT I quickly went back to weather comp. I think best to do at @TomC is, us...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 17kW Grant Aerona 3 - advice needed for pre-commissioning struggles

You should calculate 1.161 watt hours per deg C. So assuming you are going from 45-52 degC for all 300L using a 3kW element (no stratification) that...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: 17kW Grant Aerona 3 - advice needed for pre-commissioning struggles

I am facing the same challenge, how to optimise for efficiency. As per my posts on another thread, it seems, #1 - efficiency all comes down to one ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 17kW Grant Aerona 3 - advice needed for pre-commissioning struggles

I have been wondering about this myself. My night rate is almost 3x cheaper than my day rate (at the moment) and my cop day vs night likely to be les...

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

@sunandair > how do you know pump speed cannot be controlled? Yes my HP can control the pump, but I did not know that at the time as I was foll...

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

@derek-m I am back on this topic. So I looked at Grahams post on the carnot cycle, and some other stuff. And flow rate does not come into the effici...

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

@bretix I think having aluminum i the circuit mixed with steel and copper means you need to be more on top of the PH of the circulating water as this ...

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

@marvinator80 regarding -10 and ASHP - I have been told, that you need to take the "long view" and look over the whole year. This probably works bett...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: The dreaded fast "cycling"

@derek-m This is what I got when I tried to "fiddle" with the system and manually control the LWT, heat pump was very unhappy, I very quickly switched...

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

Decided to check the specs of one of my Zone valves vs ESBE @ 45 lpm - so about 4x At more modest flow rates there does not seem to be much diff...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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