An inspiring DIY ASHP installation
Super interesting DIY ASHP installation by @iancalderbank:
Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb
Subscribe and follow our Homeowners’ Q&A heat pump podcast
@bontwoody - replying to your question on the article - its easier to reply in the forum.
28mm plastic pipe inserts have a bore of about 21mm - so if you have lots of them in the path it matters. but if you use engineeringtoolbox.com, you work out the head loss for that specific length at that flow rate and bore size. then add up the head losses over the whole run. provided the section with small bore size and a higher head loss per m is very short, it contributes nothing significant to the the overall head loss and thus achievable flow rate. whereas an undersized diverter valve or mag clean can burn 1m or more of head. If you've only 5kw to transfer your target is lower so easier to achieve. be careful with the 15mm plastic - do the maths on throughput per radiator.
in my case after 1 week of running, I'm maxing at 30l/min. need to do some more testing to prove what section needs to be to be redone to push it higher. Steady state for a 21C target at 7C outside is 15l/min, 4.5kw output, COP 3.0, LWT 38, so happy-ish for 1 week in. but I know there's a group of 4 rads fed by a 3m run of 22mm plastic that are getting lower flow temps than the rest (I've got monitors on everywhere), making it hard to balance the system. My overall DT is a little lower than I'd like (between 2 and 4, averaging 3) . and my strong suspicion is it's that 22m feed thats slowing the overall rate down, so next step will be to replumb that group when its warm enough to shut the system down. I built a whole new primary side but there are bits of the secondary side that I know aren't up to spec.
My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
11.9kWp of PV
41kWh of Battery storage (3x Powerwall 2)
2x BEVs
- 26 Forums
- 2,102 Topics
- 46.2 K Posts
- 127 Online
- 3,388 Members
Latest Posts
-
RE: Compressor attempts start but fails - Nibe Fighter 2005 8kW
@skyefarmer pleased you found it!
By JamesPa , 23 minutes ago
-
The Importance of Radiator Balancing for Efficient Heating: Introducing the Flow Regulating Valve
It’s fascinating to watch how low-temperature heating i...
By Mars , 2 hours ago
-
@heacol, if you're around, can you please provide some ...
By Mars , 5 hours ago
-
RE: Servicing Hitachi HP in rural Somerset
I'd give GreenGenUK a call or email them: sales@greenge...
By Mars , 5 hours ago
-
RE: Ecodan consuming 100kwh per day in new build!!!
@anca1808 I have just reviewed the whole thread. In s...
By JamesPa , 8 hours ago
-
RE: Heating coming on when not required
I played with a max heating temp but there is a world o...
By JamesPa , 19 hours ago
-
RE: Pressure drop Primary circuit
I've always regarded topping up heating systems as my j...
By JamesPa , 19 hours ago
-
RE: Heat pump solutions and/or installer recommendations for France
I’d travel to France for work if you were struggling wi...
By Damon Blakemore , 1 day ago
-
RE: 5 Star Service from Havenwise
That's always a danger with any new good idea, @morgan....
By Majordennisbloodnok , 1 day ago
-
Have your say in the Renewable Heating Hub Awards
It’s time to celebrate the best (and call out the worst...
By Mars , 2 days ago
-
-
RE: Mitsubishi cycling while on chilled water output
@iaack yes there's no denying that cold air sinks! I s...
By downfield , 2 days ago
-
RE: Weather compensated secondary circuits with Biomass
@andycoo that flooring sounds ideal. Extra volume is ...
By Sune , 2 days ago
-
If you are thinking of heating on the immersion conside...
By JamesPa , 3 days ago
-
RE: Surface mount or bury primaries for heat pump installation?
@tomasmcguinness, I think your best bet would be using ...
By Aventus Eco , 4 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@toodles all depends on asking the right questions! And...
By Tim441 , 4 days ago
-
RE: Commencing on an ASHP Installation Process
I received confirmation this morning that my Greener Ho...
By Sheriff Fatman , 4 days ago