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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 11, 2025
Profile Activity
Topics: 17 / Replies: 2824
AllTopicsReplies
Topic
Defrost behaviours
8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 6
Views: 761
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 ...

8 months 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...

8 months 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...

8 months 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 ...

8 months 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! ...

8 months 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....

8 months 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...

8 months 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...

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

I should add to the above one other thing. It is just possible that the Midea is designed for a deltaT higher than 5C at max output, high enough th...

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

OK wrong wording on my part. Please read 'infer' instead of 'say'. Regarding the rest of this quote please read again this comment As I ob...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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