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Derek M
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Derek M
@derek-m
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Illustrious Member
Joined: Mar 4, 2021
Last seen: Sep 19, 2024
Profile Activity
Topics: 7 / Replies: 4405
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RE: Noise/ Planning Expert

@jamespa I am surprised that the school did not opt for GSHP's, since they are much quieter, can be installed inside,and probably would be more effi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

Don't panic. It was a hypothetical answer that I supplied, since the required conditions are not possible to achieve even using a modeling tool. I a...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

I performed the test that was requested, which was 12 hours @ 10C, then 12 hours @ 20C. I'm not certain what was the purpose of the test or its useful...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@jamespa I can assure you that I was not being combative, merely having some fun, otherwise I would have given my usual warning 'that I don't take p...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

You required a modeling tool to answer the questions. IAT 10 Avg. 15 20 PI 10644 74262 ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@cathoderay 250kWh was chosen because it provides a believable fall in IAT when the heat pump is stopped. I have tried various values and 250kWh see...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Let me try to explain the various problems, and then you can decide whether to explore this matter further. The 'Initial Data' sheet contains the da...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

I was merely stating that without some form of recovery boost, the time required for IAT to reach the desired value may be lengthy. A further determin...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

I think that you will find that the modeling tool already takes account of the variation of COP with load, also with OAT and LWT, by extrapolating the...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

When using the modeling tool it is first necessary to calculate the reference conditions, which in this case was 24 hour running at an OAT of 10C, giv...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@cathoderay There is no 'black box', there are no hidden cells, everything is open to view. If you don't understanding what you are seeing then plea...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@jamespa I think that you will find that degree days don't work well with heat pumps, because the COP varies quite considerably with OAT.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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