@alfapat The radiator / emitter that takes the longest to heat up will be the one LSV that remains fully open and all others will then end up somewhere between almost fully open and almost closed (though in practice, this means just a half turn or so from closed due to the nature of the valve’s design in many cases) The aim is to have as low a resistance to flow as can be achieved - hence one LSV being fully open - all others are compared to this in the end. By the way, it is quite possible that the radiator / emitter right at the end of the pipe run will be fed by the water that has released some heat by the time it gets to there and might well be the LSV that remains fully open BUT … this is not a given, an over or undersized radiator / emitter elsewhere might require more / less throttling to achieve a balance! My wife occasionally challenges me when I am walking around the house with a radiator key! Not so much a science but an art! Regards, Toodles
Toodles, he heats his home with cold draughts and cooks his food with magnets.
Posted by: @alfapat@jamespa All Rads sized.
... in theory!
If they are all (close to ) perfectly sized then adjusting setting them up for consistent deltaT across the radiator is another way to balance. Some plumbers do this by 'feel' I am told.
Its still the same laborious and iterative task of adjusting the LSVs though. We definitely need a variant of a TRV that does this automatically. It should never (or almost never) shut down completely and should work out how much to throttle by over a period of a few days. The hardware exists, it needs the right firmware, not sure whether all the TRVs in the house would have to communicate to make it work or whether they could use some sort of random delay protocol (a bit like ethernet). Essentially Adia are creating a system to do this with a central controller (which communicates with the heat pump - ideal but potentially limiting as they dont support all heat pumps); doubtless they have some future development ideas in mind.
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
@jamespa If only!
Hindsight is great , but I was presented with the design 8 yrs ago , so I can only hope that they do the job , most of the time when the temperatures are there when required , they seem to do the job.
It’s the cost of doing it !
Still at it here , correct me if I am wrong , I am still adjusting lockshields and happen to put a simple temp probe on ingoing /outgoing pipes at the Rads and the temperature at the TRV is higher than at the lockshield is this right. 😕 Surely the flow is lockshield to TRV which incedently is fully open
@alfapat I think modern TRVs can be fitted on either side. The lock shield will restrict flow whichever side it is sited
House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60
@bontwoody Thanks , In thought it was a dumb question but hey ho you learn something new every day. Slowly getting round to turning lockshields down.
@alfapat There is no such thing as a dumb question, just a dumb answer 🙂
House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60
@alfapat One would expect the flow to be into the emitter from the TRV but, my installers informed me that the modern valve bodies are so made that direction of flow is no longer important. In terms of the LSV, it is restricting the flow, regardless of whether it is in the flow or return run. Regards, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
@bontwoody We all learn summat every day - it is just that some of us (me in particular) forget to remember it!😉 Regrets, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
Posted by: @toodles@bontwoody We all learn summat every day - it is just that some of us (me in particular) forget to remember it!😉 Regrets, Toodles.
🤣
The bodies of TRVs usually have an arrow on them. If it can operate bidirectionally it will be a bidirectional arrow!
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
- 22 Forums
- 2,057 Topics
- 44.9 K Posts
- 31 Online
- 3,299 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: IVT Greenline high pressure switch and electrical cassette errors
OK, so when the HP comes on it becomes obvious.It's on ...
By tdudgeon , 2 hours ago
-
RE: Is Your 6kW Air Source Heat Pump Really a 6kW?
@johnmo I think we’ve been trudging through the same...
By SUNandAIR , 3 hours ago
-
RE: Heat Pump Manufacturers Recommending Buffer Tanks
One manufacturer Viessmann has to have their buffer, as...
By Johnmo , 10 hours ago
-
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide
Good luck, I hope it all works out!
By JamesPa , 1 day ago
-
@johnd it's a difficult one, because we've seen instanc...
By Mars , 1 day ago
-
RE: Is your heat pump insured?
@johnmo sorry it comes across like that. The post is au...
By KevinPotts , 1 day ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
@johnmo Perhaps a little detail might explain my reason...
By Toodles , 1 day ago
-
Win a 6-panel PV courtesy of egg and Renewable Heating Hub
Our epic giveaway just went live! Want to win a 6-pan...
By Mars , 2 days ago
-
RE: Yes, the "zoning with ASHP" topic again...
James, thanks again for your thoughtful and persistent ...
By HarryRea , 2 days ago
-
RE: Is this normal? Click of the DHW returning to space heating
So the Lone Ranger returned today! Even though we thoro...
By Grantmethestrength , 2 days ago
-
RE: Vaillant & OVO partner up to offer Heat Pump Plus
Hopefully iv done the right thing today by signing up t...
By Westkent , 2 days ago
-
RE: Battery sizing - How low can you go!
My own experience with connecting four batteries to thr...
By Transparent , 2 days ago
-
RE: Plate heat exchanger considerations
Work on 2-3 percent per degree. This is a reasonable e...
By JamesPa , 3 days ago
-
RE: Advice for ground source heat pump in new build with PV and batteries
The useful bit is the bit that specifies the heat loss ...
By JamesPa , 3 days ago
-
RE: Volumisers in Heat Pump Systems: Does Placement Matter?
You’re absolutely right that during defrost the refrige...
By Mars , 3 days ago
-
@editor thanks Mars that’s the same table I found in th...
By Gary , 3 days ago
-
RE: Tariff and charging strategy advice please
They haven't asked me to prove that I have an EV (I do)...
By JamesPa , 3 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
Took a while to find on the OFGEN site: ”The FIT sche...
By AgentGeorge , 3 days ago
-
RE: why solar diverters for HW instead of the heat pump?
For me there are few factors why you may want to heat w...
By Johnmo , 3 days ago