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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 12, 2025
Profile Activity
Topics: 17 / Replies: 2129
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RE: 14kW Midea ASHP in an old leaky building

@derek-m - yes, certainly an option, but I've always wondered how much benefit you get from wall reflectors, given they reflect back onto the radiator...

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

Indeed. My room with the greatest heat loss is the kitchen, with its three (or rather two and a half) solid stone outside walls, a good half of which ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New Valiant ASHP system in NE Scotland

Not all elected representatives are elected equal. The problem, which I chose to make my problem, which is nonetheless a very common problem: how t...

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

Thanks for the tips about detecting cold spots and drafts. On a windy day there are place near doors/windows where I can feel a draft, and during gale...

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

@derek-m - yes, an adjusted curve makes sense, maybe something along the lines I suggested in my last post, 60@-2/40@15? By the bye, the rads seem to ...

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

@derek-m (and others) - readings with (at 1200 noon yesterday) weather comp turned off (Preset Temperature > Weather Set Temp > Zine 1 H-Mode Hi...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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)
Reply
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)
Page 172 / 179
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