Newbie

[DOIGAN]

On 09/02/2020 at 18:38, Stones said:

In respect of your MVHR, we have a Vent Axia as well, and generally it seems to be performing at round 90% efficiency.  I know you say its cold air coming from the supply vents.  Have you measured the temperature of that incoming air (it will be below whatever the room temperature is and will feel cool, think of the effect of wind chill - feels colder than it is)

Hi Stones, 

I live in Orphir,  no I have  not measured the air temp.  I think  the biggest  problem is  probably just my wife and I,  our last 3 homes have all been new builds and drafts were not common,  this is why I  think we notice  it more,  especially  in the lounge  as we have a  vaulted ceiling. 

Where are you? 

[DOIGAN]

Hi Peter,  I am sure that  this is  because  they don't do the base,  it is up to the builder.  I can only assume that  any decent  builder  would  use an insulated  base,  no? 

[DOIGAN]

On 09/02/2020 at 16:27, PeterStarck said:

Do you know what type and thickness of insulation you have under the UFH pipework.

Found  this Peter 

20652-002A (1).pdf

[Jeremy Harris]

58 minutes ago, DOIGAN said:

Hi Stones, 

I live in Orphir,  no I have  not measured the air temp.  I think  the biggest  problem is  probably just my wife and I,  our last 3 homes have all been new builds and drafts were not common,  this is why I  think we notice  it more,  especially  in the lounge  as we have a  vaulted ceiling. 

Where are you? 

 

I reckon the two of you are around 8 to 10 miles from each other.

[DOIGAN]

You are 20 minutes  from anywhere  in Orkney ?

[Gone West]

12 hours ago, DOIGAN said:

Found  this Peter 

If your house ground floor is built as the drawing then it looks like you have 100mm Styrofoam Floormate 200X. This has a thermal conductivity of 0.0278W/mK, which is good although it would be better if it was thicker. It doesn't appear to be manufactured any longer. The 200 in the name relates to the compressive strength and the X to the blowing gas which was a type of HFC which is no longer used. With UFH you will be losing some heat to the ground and if the rest of the insulation in the house isn't very high you will have to run the UFH at a higher temperature to offset the losses.

[DOIGAN]

Thanks  Peter,  assume the builders may have  used minimum  spec to please planning  etc.  It is a bungalow so presume  this  may compound  any potential  heat loss.  Have to accept  higher heating  bills. 

[Stones]

@DOIGAN  I'll cover my thoughts on the ASHP in the other thread.

 

Two things I think we could do in respect of your MVHR.  First install silencers in the main duct runs near the actual unit to reduce the noise to the supply and extract vents.  You can get these off the shelf (e.g.  https://www.bpcventilation.com/attenuator-silencer ), or make something yourself like this:

 

Fitting smaller silencers at each supply valve is also an option.

 

Second, you could fit a directional air valve in the living room so it pushes all the incoming air upwards / away from the sofa.  

 

Third, you have the option of fitting acoustic valves to all the supply vents to reduce noise levels (on top of the reduction you would achieve fitting sliencers)

 

In addition I would suggest checking the duct runs to make sure they are either insulated or laid underneath the insulation layer in your loft.

 

We run our MVHR at 35%, boost 55%.  As discussed, I'm a great believer in the benefits of MVHR, both in terms of fresh air, eliminating condensation and heat recovery.