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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Oct 1, 2025
Profile Activity
Topics: 17 / Replies: 2189
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Reply
RE: 14kW Midea ASHP in an old leaky building

Current (0915h) flow/return temps and top middle rear panel rad temps: Midea controller: Ambient: 7; LWT 47; RWT 41 PHE pipework: Primary in 45; p...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

This gets complicated. Firstly there is the nominal output, as listed in the catalogues, usually at a delta t of 50. A correction factor then has to b...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@derke-m - Argghhh!!!! The forum has just deleted my reply. very frustrating. 'Something went wrong with your submission' or words to that effect, and...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@derek-m - OK, here are some minute by minute readings, col head abbreviations as before, csv text format. Ambient throughout was 5 degrees: Time,LW...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@mookyfoo - Midea promote themselves as being value for money, based on economies of scale, they are a huge company. They also promote themselves on t...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@batalto - I think they may have photographed the board, they certainly photographed other parts of the system. I have to be mindful that if something...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@mookyfoo - two 16kW heat pumps is certainly plenty of redundancy in a house with a heat loss of around 13.5kW! If two are really necessary, one would...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@derek-m - I don't know the model of the PHE, only its's make (Secespol) which is on the foam insulating jacket, which can't be removed without damage...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

1800 hours: bedroom 17.5 (vs 19) bathroom 20.0 (vs 22) kitchen 17.4 (vs 19). All have benefited from recent solar gain, especially bathroom and kitche...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@batalto - I'm currently on the standard Freedom weather com curve, 55@-2/37@15. Bumping up the top end will do even nastier things to my COPs and is ...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@batalto - my provisional conclusions are that the problem, or part of the problem, the PHE may also be partly to blame, is the nominal 14kW Midea hea...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 14kW Midea ASHP in an old leaky building

@batalto - yes, in effect, I had my full room by room heat loss calcs from when I first designed installed the CH in the 1980s, and I also had the hea...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
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