Column radiators for heat pump
I have seen a couple of fancy column radiator recommendations kicking about in this forum which work well with a heat pump. Currently our single panel classic convection radiator in the hallway is not large enough to match the heat loss of the hall with the door opening etc.
I really want to go traditional column rather than stelrad K2 or K3... is this a bad idea? Does anyone have a calculator for calculating the BTU at lower temperatures?
Posted by: @encI have seen a couple of fancy column radiator recommendations kicking about in this forum which work well with a heat pump. Currently our single panel classic convection radiator in the hallway is not large enough to match the heat loss of the hall with the door opening etc.
I really want to go traditional column rather than stelrad K2 or K3... is this a bad idea? Does anyone have a calculator for calculating the BTU at lower temperatures?
Radiator manufacturers generally provide either outputs at lower temperatures, an equation, or the 'exponent'. For radiators other than fan radiators (and possibly radiators with a very high 'aspect ratio') the equation is invariably "output is proportional to deltaT^n" where deltaT is the average temp difference radiator to room and ^n means raised to the power of n (n is 'the exponent'). Furthermore n is almost invariably 1.3 or very close, so output is proportional to deltaT^1.3.
Thus (for example) a radiator that outputs 1kW at 50C deltaT will output (25/50)^1.3x1kW at 25C deltaT = 406W.
I don't know of any reason why fancy column radiators should perform particularly badly or particularly well with a heat pump, however others might,
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.
I have a couple of tall (1.8m) column radiators im my kitchen diner. I presently have a boiler and have assumed the usual downrating for ASHPs. One problem I have experienced with my boiler setup is that it takes an age for the radiator to heat up. Flow and return are both at the bottom of the radiator and the installer did not fit the baffle - available seperately - to divert the flow up the first column to the top of the radiator. Conequently, the flow much refers to go straight across the bottom of the radiator from inlet to outlet. I don't know what would happen with the lower flow temperatures and higher flow rate with an ASHP in this situation, but I would definitely recommend ensuring flow across diagonal corners one way or another.
We have an 1800x500x100 mm. radiator in our dining area (insufficient wall space for conventional shape. This one works with our heat pump and provides a very even radiant heat over the whole panel space and I assume the convection is equally good - but it is well above our heads! Regards, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
- 26 Forums
- 2,151 Topics
- 47.2 K Posts
- 35 Online
- 5,666 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Midea ASHP – how to set weather compensation
@cathoderay the in/out temps I posted were from the sam...
By pash44pump , 11 minutes ago
-
RE: Ecodan & MelCloud scheduling
@westkent Feel free to take a look atif you feel limite...
By HCas , 1 hour ago
-
RE: Electricity price predictions
One thing we can be sure of is that whatever contracts ...
By Tim441 , 2 hours ago
-
RE: What crazy nonsense are inverter limits and why are they imposed?
@transparent The only reason my DNO knows of these is b...
By Lucia , 3 hours ago
-
RE: Rodents! A word of warning for heat pump owners
@tim441 I will need to give some thought to protect the...
By Lucia , 3 hours ago
-
RE: A Customer's Lessons Learnt from a Heat Pump Installation in a Large House
🙁🙁🙁🙁🙁
By Lucia , 3 hours ago
-
What is the Heat Geek Guarantee?
We regularly hear from homeowners who are researching i...
By Mars , 22 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
@adamk, interesting point. I’ve not focused much on Hea...
By Mars , 4 hours ago
-
RE: is a home battery without an EV worth it?
@jamespa having just had a heat pump installed I do won...
By AdamK , 14 hours ago
-
Intelligent Octopus Flux (IOF) Review
I promised @toodles that I would provide an update and ...
By Old_Scientist , 16 hours ago
-
RE: Octopus tariffs - a quick comparison
Interesting comparison! Another good angle is the dif...
By HCas , 19 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@julianc Our solar PV has produced more this August tha...
By Toodles , 1 day ago
-
RE: Who's your electricity provider and what's your tariff?
I am pleased to see the change. We definitely need t...
By Jeff , 2 days ago
-
RE: How Do I Know When the Hot Water Has Run Out?
@transparent that is a very interesting suggestion, tha...
By GrahamF , 3 days ago
-
RE: The good, the bad and the not that great – my heat pump installation
Sorry to resurrect this thread, but it is sort of relev...
By cathodeRay , 3 days ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
I missed your 22nd June post on this. I am sure it can ...
By cathodeRay , 3 days ago
-
Now posting on the right topic.... With general build...
By benson , 3 days ago
-
RE: How to waste energy (and time) playing with AI.
I’m sure like many software toys that it is addictive! ...
By Judith , 3 days ago
-
RE: Does anyone have experience of a smart water meter?
@judith With Anglia Water it was a compulsory upgr...
By TechnoGeek , 4 days ago
-
RE: Balancing financial efficiency and comfort using the Octopus Cosy tariff
We’re high energy users other than the ashp so the OVO ...
By Judith , 4 days ago