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Do we need to worry about too much solar gain for saps calculations?


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Posted

We will have a large glass, south facing door (in place of old barn door) 

will this be seen as a negative in the saps calculation? Do we need to worry about a way of reducing the solar gain? (I would just open it personally… ) 

Posted

The glass can have a coating to reduce solar glare. I think you have to put extra insulation elsewhere  if you have XS glass, there’s a calculation for it.

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Posted (edited)

Yes, you need to have this calculated and taken in to consideration of the overall design.

 

Again, you need to engage somebody who knows all this stuff. 

 

Our architect used PHPP to model heat loss and heat gain, this was invaluable. Our house gets quite hot in the summer, but would have been a lot worse if we hadn't modelled it and tweaked the design.

 

You can mitigate with shading, shutters, costings etc. but best is to reduce the glass area, also benefits in winter with less heat loss. Hard to tell without drawings.

Edited by Conor
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Posted
7 minutes ago, K44 said:

We will have a large glass, south facing door (in place of old barn door) 

will this be seen as a negative in the saps calculation? Do we need to worry about a way of reducing the solar gain? (I would just open it personally… ) 

If your glazing is greater than 25% of the floor area this will impact the SAP.

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Posted
21 minutes ago, ETC said:

If your glazing is greater than 25% of the floor area this will impact the SAP.

This is something I look at even in Scotland.

 

An area of glazing facing south to south west can increase the room temperature fiendishly in a well insulated structure.

 

Now I've made my simplistic and practical design approach to UFH many times on BH.

 

I'm doing a design at the moment and warning the Client about over heating and the costs of mitigating that.

 

It's old sckool stuff but we have a thing called a North Light roof window. This was commonly adopted in 1950 -1960's drawing offices where you want indirect light / maximum light in the winter.. hence it was called a North Light window. In profile the roof looks like the cutting edge of a wood saw blade.

 

Over the last couple of decades I've seen this drive for open plan spaces. But they are noisy not least.

 

In some ways, it's like fashion clothes design. While there will always be a desire for a bit of open plan space I think the massive ones will go out of fashion.. mainly driven by the rest of the clothes / lifestyle industry.

 

What that means is that we will have smaller rooms that need to be lit in traditional ways which can potentially mitigate some of the overheating issues.

 

 

 

 

 

 

 

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Posted (edited)
6 hours ago, Gus Potter said:

What that means is that we will have smaller rooms

And walls can make usable space, oddly.

Edited by SteamyTea
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Posted

Yes you might get technically too much heat gain. You have to find a way of passing reg's.

In real life you find out if it is a problem and deal with it. We put big thick curtains in for the winter and they work for the summer.

We fitted them to reach floor and ceiling, to keep the heat in that closed pocket.

 

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