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BobTSkutter
@bobtskutter
Member
Estimable Member
539 kWhs
Joined: Jan 11, 2025
Last seen: Feb 27, 2025
Profile Activity
Topics: 1 / Replies: 85
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Reply
RE: Is My Midea Heat Pump Inherently Defective?

^Hey, look at that, it worked 🙂 OK, This is a pump curve. The top one shows Head against volumetric flow at different pump speeds. The chart show...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Hello again,I wonder what's going on here? The system seems to have landed at an equilibrium point. LWT = Set_LWT and the compressor has slowed do...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Hello,I'm not very good with using quotes from forum posts, so I'll try to use headings insted.How did I calculate the secondary flow rate?If you igno...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

I found an install manual for an MD16IU-008DW unit. Can you find the value of dT1SH? It might be in "ServiceMan / 3. Heat mode settings" The manu...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

OK, I calculate a flow of about 1.9m3/hr in the secondary circuit. This is the Grundfos web page for the pump data: You said CC3, that gives a ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Hello. OK, I've plotted your PEX data in the attached spreadsheet. The data shows your PEX is pinched between Prim_in and Sec_Out. That means the ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Hello, A quick reply, I need to go out but will be back later. You said the plate exchanger was installed non-countercurrent. Please can you post a...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

@cathoderay thanks for sharing that data. There's not much numerical analysis I can do with it because I need to know 1 flow. Please let me talk (t...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Ahhhh.... When your system is operating at it's equilibrium point the energy from the heat pump is released into the room by the radiators, but ther...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Right, this carries on from this post (Hopefully I got that right). How can I sanity check the amount of ice accumulating in an 8kW ASHP? I th...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP for small garage and workshop

@cathoderay, darn it. I missed your comment about room temperature. I've also worked out your primary system volume, 20L. That's small. You have ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP for small garage and workshop

@transparent Thank you for that suggestion. I had seen that type of unit. They fall under the F-Gas regulations in the UK, because there's a refrige...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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