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JamesPa
JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Oct 22, 2026
Profile Activity
Topics: 28 / Replies: 5526
AllTopicsReplies
Reply
RE: ASHP and how it should run and potential kw consumption?

I am planning on trialling night time 'set forward' to take advantage of cheap rate tarrif. I have no idea if it will work in practice. The challeng...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Thanks for that, I think there is much comfort to be drawn because of: ... with which, based on everything you have told me, I agree. My heat ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Defrost behaviours
2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 22
Views: 5051
Reply
RE: ASHP and how it should run and potential kw consumption?

I think that conditions over the last couple of days are about the worst possible - cold but very wet = lots of defrost. I too am interested in what ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Analysing MELcloud heat pump graphs

I'm not an ecodan expert but this looks like defrost to me. The give away is that FT goes below RT.. Conditions for defrost are about as bad as they...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

I think you are very likely right unfortunately. This is a somewhat surprising conclusion given that the system was presumably designed by Freedom an...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

I confess Im a bit mystified. How was the WC curve determined. If it was determined experimentally, then cycling and losses in PHE etc would be, at ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

It claims to use the energy integral as part of the cycling control loop, but is silent about how the defrost control loop works, so I dont know! ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

One might expect (hope) that the heat pump takes this into account in the control circuit, by accumulating differences and overshooting to compensate....

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

OK, so (assuming Freedom are correct) you actually have two problems. The principal one is that the max pump rate is insufficient, leading to your ou...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

All agreed In detail that is true. However its a dead cert that its primary control loop adjusts the compressor frequency and fan speed to a...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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