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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: No-code, plug-and-play monitoring for your heat pump

Good thinking. I've also had a look at the connections in the photo, and it looks like a standard two wire modbus/RS485 hookup plus DC power supply:

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: No-code, plug-and-play monitoring for your heat pump

Very interesting indeed. I think at a basic level it is identical to my system: modbus connection to the heat pump, then read and write data over that...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pump efficiency v Outside Air Temperature

Are you able to describe how you do this, what kit you use, and how you get the data into a computer? At the moment I use the sensor in the heat pump ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I'm sure that is absolutely right!

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I think it's called market forces, the efficiency of markets, or whatever those who work in the field that makes astrology look reputable call it thes...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Which is the point I was trying to make using lay language. The throttle effect (at 11 down to 8 kW) is around 27%, the efficiency losses are (much?) ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

It was a rhetorical question (? at the end), not an assumption! Yes, I get that, but how large is that loss percentage-wise? The throttling effec...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I'm still sure about this, I think we might be mixing up throughput with efficiency. Consider the PHE as a form of obstruction: it restricts throughpu...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I'm pretty sure this was Freedom. In effect, as I understand it, they supply an installation kit, and the installer installs what is in the kit. I've ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Interesting, I've just done what you suggest, but I don't think it gets near a QED threshold, and as we all know, and you say ('plenty of other reason...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

But it is just unrealistic to expect most people in the real world to do this. And there is a related question, should they be expected to do it?

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

This is a variation on efficacy vs effectiveness. That's what Midea say in their 'ideal' manual. In the real world, stuff happens, Freedom offer train...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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