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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 14, 2025
Profile Activity
Topics: 18 / Replies: 3364
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RE: MCS heat pump pre-sale information and performance calculation

Agree. I looked at daily vs OAT and peaks/distributions of 3, 6 and 12 hourly averages. The former gave me a figure, the latter (which were fairly s...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: MCS heat pump pre-sale information and performance calculation

Yes, precisely that (at a specified outdoor temperature) A question I have been asking quite loudly (on this forum and elsewhere) for a year or m...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I am referring to Occams razor in the sense of cutting out the unnecessary and I explain this in my post. If its unnecessary (in a particular applica...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS heat pump pre-sale information and performance calculation

Whilst I totally agree that an accurate heat loss determination is absolutely essential (and have made many comments about how unsatisfactory the curr...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: MCS heat pump pre-sale information and performance calculation

My reading is this: Its headed 'pre sale' and says its for use 'in conjunction with MIS 3005D.' MIS 3005D specifies that a heat load calculation m...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: non-Mitsubishi owners - how much control do you have over your ASHP "freeze stat" function?

That all sounds plausible. Neither heat pump nor boiler manufacturers seem to be particularly precise about what these sort of functions do. The obj...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air source heat pump roll call

Forum Handle: @jamespa Manufacturer: Vaillant Model: Arotherm Plus 7kW Type: ASHP Arrangement: Mono Area of Country: Southern England Home...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: non-Mitsubishi owners - how much control do you have over your ASHP "freeze stat" function?

So So far as I can tell absolutely no control available on my Vaillant, it kicks in at 4C It switches on the heating (typically periodically or a...

11 months 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

Occams razor comes to mind here. In any good system design every component has a purpose. If the purpose has little or no value then the same is tru...

11 months 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

These are all very good questions. Unfortunately most people are reliant on installers to do the 'design' and decide what valves are (or are not) put...

11 months 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

PSPICE I think, it seems highly likely that a heat pump system, including the house, can be described in electronic terms. Cant see the average plumb...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung R290 Monobloc built-in pump - is my buffer tank restricting system SCOP?

That looks like a tiny buffer plumbed with 4 ports and no temperature sensor to allow the heat pump to equalise flow rates, as well as quite a lot of ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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