Octopus ASHP

wrf12345

what about looking at it the other way round if the bedroom is north facing, internal insulation on the north wall, secondary glazing (or fill part of the window with insulation board and hide behind curtains), etc., all DIY so not too expensive

Nick_Dr1

Would it not make sense to measure the temperature of the input and output of the radiator with a couple of thermocouples? Then you'd know the delta (difference) between them. If that's out of spec or the input flow is too cold then at lease you know its a heat delivery problem rather than an insulation problem. If the input temperature and delta is correct then the radiator is too small for the room. Then you need (either/both) a bigger radiator and better insulation.

Adrian_Dorr

From you saying that it takes n hours to reach a particular temperature I assume that you are switching the heating off or right down for some time. 

As heat pumps run at at lower flow temperature and are much less efficient when trying to heat up a room quickly (using a higher temperature), rather then just maintaining a given temperature, one bit of advice is to keep a constant temperature 24/7. In that case it won’t matter how long it takes. 

And leave the tvrs fully open at all times. 

Also see this: https://m.youtube.com/watch?v=kGs_biFA87Q&pp=ygUnSGVhdCBwdW1wIGNvbnN0YW50IHRlbXBlcmF0dXJlIGhlYXRnZWVr

Reed_Richards

Some people parrot the Heat Geek "wisdom" on the issue of how to run a heat pump.  I think the truth is more complex and depends a lot on the circumstances of the building, the installation and personal preferences about what heat you want when.  What Heat Geek advocate is certainly applicable in some instances but I don't believe it's one-answer-fits-all. 

markryderjones

I think you need to ask Octopus what the calculated design temperature for your bedroom is. It may well be that it’s been designed only to achieve 18 C. Once you know the answer to this question you will know whether or not the system is achieving its design performance. If not then the question is what Octopus are going to do to resolve the problem until it achieves its design performance. The CIBSE Guide B states that bedrooms should be maintained at a minimum temperature of 20°C ± 1°C

shinytop

Turn up all your TRVs.  Set your ASHP to fixed flow at 45 deg.  Wait a  few hours then (1) Radiators should all be the same temperature, a bit less than 45 deg (so hot to the touch but not too hot) and (2) With current weather, your house should be warm throughout; 21-22 deg or more.  If either (1) or (2) are false then there is something wrong with the ASHP, the flow or the basic settings. Or the ASHP is too small. 

70sbudgie

markryderjones said:

I think you need to ask Octopus what the calculated design temperature for your bedroom is. It may well be that it’s been designed only to achieve 18 C. Once you know the answer to this question you will know whether or not the system is achieving its design performance. If not then the question is what Octopus are going to do to resolve the problem until it achieves its design performance. The CIBSE Guide B states that bedrooms should be maintained at a minimum temperature of 20°C ± 1°C

From the OP's comments, it seems as though the rest of the system is ok, it is just this one room that is a problem.

I will echo @markryderjones 's comment that you need to find out whether Octopus know that you are expecting this particular room be at the temperature of a living room. It may just be that it needs a bigger radiator to heat it to your requirement rather than the standard for a bedroom. 

I am in the process of getting a HP quote from Octopus and one of my questions has been whether they would allow me to request design changes to make the design more bespoke to my particular requirements. The answer I've had was yes. Admittedly, I've not had a chance to test that yet.

Exiled_Tyke

 
This was in the specs which Octopus sent me in their contract/proposal so I'm guessing the Op has the same and that bedroom temperatures are indeed expected to be 18. 

NedS

Exiled_Tyke said:

 
This was in the specs which Octopus sent me in their contract/proposal so I'm guessing the Op has the same and that bedroom temperatures are indeed expected to be 18. 

Yes, the MCS recommendation for a bedroom is 18C, so that is what they will design to if they are issuing MCS certification on the installation. If the bedroom is at 18C then the system is working to design. If the OP wants it hotter, they'd need to install a bigger radiator in that room, or some secondary form of heating such as an additional electric heater.

QrizB

@ninjaef noting that you started this thread in April last year, do you still have the problem or have you sorted it out?

If you have sorted it out, what did you do to fix it?