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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Aug 15, 2025
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Topics: 17 / Replies: 2075
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RE: 14kW Midea ASHP in an old leaky building

There are also small but cumulative losses eg cleaning a magnetic filter (though I suppose one could catch and recycle the water) and bleeding rads. I...

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

Ah, OK, thanks. So far, running at 55 degree LWT has the house feeling warmer, room temps up, but it's 'only' 8 degrees outside, so demand is not at i...

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

@batalto - point taken, it's also the linear/area thing, half the diameter = a quarter the area. You are also spot on with the primary circuit length,...

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

@batalto - you will have seen @derek-m's remarks about the PHE above, 3 degrees loss through the PHE from primary to secondary, which suggests that at...

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

Exactly, it is the unfortunate use of a unit of time in the name that makes it seem like a rate, when in fact it is a quantity (that can then be produ...

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

Interesting. I will see if anyone comments further on your 'ramblings' (which look very erudite to me), in the meantime, to clarify: ie kg/s = l/s...

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

One final very simple, I hope, example: two convector heaters, one 1.5kW and one 3kW. The 3kW one delivers heat energy at twice the rate of the 1.5kW ...

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

Indeed. I have read some accounts that do a sort of vanishing trick, where everything gets divided by itself, and all disappears into oblivion, though...

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

As @robl has pointed out, it is easy to get confused by the apparent similarity between mph (miles per hour) and kWh (kilowatt hours) but there is the...

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

@batalto (and others) - having cleaned the filter, and let the system run for a while, I am pleased to say the Midea controller is reporting a higher ...

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

@batalto - OK, thanks, now done. I did turn the DHW off and room stat down. A fair amount of crud, but that is after almost two months of near continu...

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

@batalto - thanks, I will check the filter and report back. Before I check it, presumably you need to turn the heating and DHW off before doing it?

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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