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Octopus design temperatures confusion

 
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Air Source Heat Pumps (ASHPs)
Last Post by AndrewJ 1 year ago
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4391
05/02/2025 9:46 am  

Posted by: @andrewj
↑

If I want the room that is 16c to be held at 21c I could expect the other two rooms to be overheated (by 5c?) and the efficiency to fall through the floor.  I don't even know how I would achieve this under a weather compensation set up

No to the first.  You can reduce the temperature of the other rooms by adjusting the lockshield valves.  You have to do this anyway because radiators are never perfectly sized.  This is called balancing and is part of the installation process although, because it takes time (hours or days) to get spot on often needs to be finished by the homeowner of it is to be done properly.

However you are correct that there is an efficiency penalty because you will have to run at a higher flow temperature.


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.


   
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 AndrewJ
(@andrewj)
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Joined: 1 year ago
Posts: 191
Topic starter 05/02/2025 11:27 am  

Posted by: @jamespa
↑

Posted by: @andrewj
↑

Posted by: @jamespa
↑

I suspect 60dc120 means 60cm high 120cm long double convector.  SC single convector.

Do you know how single/double convector relates to Type 21 or Type 22?  Does that relate to SC and DC respectively - sounds feasible?

 

Not exactly.  Type 11 = 1 panel, set of fins, type 21 = 2 panels 1 set of fins, type 22 =  2 panels 2 sets of fins.  Unfortunately SC could be 11 or 21 and DC could be 21 or 22.  I just dont know the Octopus terminology. 

You may be able to deduce it from the variants on the list, or alternatively from the output.   Radiator output is proportional to deltaT to the power 1.3, and 1W = 3.41btu/hr so conversions could in principle be done, but it might be simpler to ask

 

 

It seems SC = K1 = Type 11 and DC = K2 =1 = Type 22

 

 



   
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