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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: Heat pumps and on/off working - starting to quantify it

Those emoncms charts continue not to impress (at least for me). The colours are hard to distinguish (and I am not colour blind so far as I know) but e...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

Part 2: Detailed Hardware Specification One of the problems that I had was that I was not familiar with the types of hardware I needed. I would know...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

As long as we trust it as a valid reading, the modbus LWT is the LWT, ditto for the RWT and flow rate (all on the primary circuit side, as measured by...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

Zooming in is again perhaps helpful. This is midnight to 2am last night, and although there is cycling, the average LWT does seem to be about 33 degre...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

Yes, I have a PHE, but no buffer, standard Freedom Heat Pump setup. As we have since discovered, they don't know whether a PHE is a 'warranty requirem...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

@derek-m - thanks, I have downloaded it and will see how I get on. I'm also going to tweak the WC curve a bit, probably start by lowering the right ha...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

And the formulas - still trying to get my head round them, and I am no stranger to spreadsheets. It looks like you imported the data from the Midea...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

OK, I think I get it (col D is confusing, because the header only has COP/LWT), but the numbers still don't reflect reality eg (from the zoomed in cha...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

I've just zoomed in on the frequent cycling (from 0000 to 0200 this morning), and close up, it doesn't look too bad: It's 'only' cycling twice...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

The corresponding energy out figures summed from the csv data files are 257 kWh for the Midea app, 264 kWh for my calculated figure, giving average to...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

Duh, I can be so dumb sometimes! I've just remembered I've got an independent way of checking energy in: the external heat pump dedicated kWh meter. T...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Real world connection to a heat pump over modbus

@derek-m - I don't think the model and the real world agree, but there is one thing I am not sure about in the spreadsheet, what to enter for the Tota...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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