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Daikin Altherma 3M in Buckinghamshire

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Air Source Heat Pumps (ASHPs)

Last Post by BridgetJohn 2 years ago

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cycleneil

(@cycleneil)

Estimable Member Member

632 kWhs

Joined: 2 years ago

Posts: 40

06/04/2022 5:37 pm

@bridgetjohn Do you mean single- pipe like the link: https://www.buildingservicesindex.co.uk/entry/136545/AEL-Heating-Solutions-Ltd/Single-or-two-pipe-central-heating-system/

Like that?

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BridgetJohn

(@bridgetjohn)

Estimable Member Member

266 kWhs

Joined: 2 years ago

Posts: 51

Topic starter 07/04/2022 8:24 am

@cycleneil Hi, yes, that's what I understand. Ours is apparently single pipe and that is what is potentially causing the rushing water noise in the towel rail which links directly off the pipes in the airing cupboard before they disappear into the floorboards and service the rest of the radiators.

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cycleneil

(@cycleneil)

Estimable Member Member

632 kWhs

Joined: 2 years ago

Posts: 40

07/04/2022 5:25 pm

@bridgetjohn Oh dear. I’m surprised that the installer didn’t convert to a 2-pipe system as a routine measure, the 1-pipe systems date back to the early days of central heating and never really worked well even then.

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BridgetJohn

(@bridgetjohn)

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266 kWhs

Joined: 2 years ago

Posts: 51

Topic starter 12/04/2022 9:42 am

@derek-m

Installer has proposed

"We have discussed your system and feel it would help if we separated the heat pump from the existing system by reconfiguring the buffer vessel to a low loss header and installing a secondary pump to the heating system. This will mean we can control the pump speed around the existing system which should in turn reduce the noise issues. "

Any thoughts?

also see above about suspected Single Pipe system. The house was built in the 70's and extended late 70's.

Thanks in advance.

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JulianC

(@julianc)

Prominent Member Member

1033 kWhs

Joined: 3 years ago

Posts: 304

12/04/2022 12:11 pm

@bridgetjohn that is the solution I have - see Worcestershire ASHP.

The purests would say this adds complexity and reduces efficiency. Which is probably true. Ideally you’d change radiators and reduce flow temperature.
I’m getting SCOP of 3.3 controlled via a Nest. I will change to weather compensation from end of April (after 1year ownership) to compare and hopefully improve SCOP. And my bungalow is warm with no radiator changes

Daikin Altherma 3H HT 18kW ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Hyundai Ioniq 5 P45 electric vehicles with Myenergi Zappi mk1 charger

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BridgetJohn

(@bridgetjohn)

Estimable Member Member

266 kWhs

Joined: 2 years ago

Posts: 51

Topic starter 22/07/2022 6:43 am

Update on this. The bathroom towel rail plumbing was re-routed so that stopped that noise. The low loss header added and that reduced the flow noise in the airing cupboard.
apparently if we want to add underfloor heating downstairs we’d have had to do that anyway?
we’ve also added a bit of soundproof board to the adjacent bedroom wall but don’t know if that works yet as heating is off for summer.

just left with very large electricity bill for the two months when first installed with faulty PCB board so we had to use Booster all the time and run on leaving water temp thermostat. Really bad that Daikin supplied faulty kit and didn’t compensate us for the consequences. It’d be like buying a faulty car and getting a huge fuel bill because it was running inefficiency and then refusing to rectify it or compensate.

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