Cooling tips

[Harry Bloomfield]

Quantify eventually. What temperature do you expect the internal wall surface to be during the heat of the day, on a robustly insulated cavity wall?

You wanted graphs? This is my home's temperature graphs for the past 24 hours. The yellow represents the indoor temperature, the blue the outdoor.

My too hot weather regime, is one of closing windows, drawing blinds to limit solar gain, just having a fly screened back door open for ventilation.

My home is reasonably well insulated, hence the yellow line is fairly flat, but it does drift slowly up, as the outdoor temperature increases. Come bedtime, at around 11pm, the windows are opened to vent the heat gain (despite the insulation) from the day/human activity/use of appliances.

You will note - insulation can delay temperature rises, and falls, but it can only delay the inevitable, and smooth out the average.

 

[noseall]

You wanted graphs? This is my home's temperature graphs for the past 24 hours. The yellow represents the indoor temperature, the blue the outdoor.

My too hot weather regime, is one of closing windows, drawing blinds to limit solar gain, just having a fly screened back door open for ventilation.

My home is reasonably well insulated, hence the yellow line is fairly flat, but it does drift slowly up, as the outdoor temperature increases. Come bedtime, at around 11pm, the windows are opened to vent the heat gain (despite the insulation) from the day/human activity/use of appliances.

You will note - insulation can delay temperature rises, and falls, but it can only delay the inevitable, and smooth out the average.

View attachment 385260

Not what I asked is it.

Any house can be hotter than satans A'hole as long as it has window, in spite of insulation.

I asked you to demonstrate heat transfer through a robustly insulated cavity wall, during a regular hot day scenario. I'd like to see this 'inevitable' heat through the insulation you blathered about.

 

[motorbiking]

Not what I asked is it.

Any house can be hotter than satans A'hole as long as it has window, in spite of insulation.

I asked you to demonstrate heat transfer through a robustly insulated cavity wall, during a regular hot day scenario. I'd like to see this 'inevitable' heat through the insulation you blathered about.

You are still demonstrating a complete lack of understanding of the subject.

The fact that you keep using the phrase robustly insulated cavity wall, shows you haven't a clue.

Why do you think in hot countries they don't insulate the roof? Insulation slows heat transfer, it does not stop it, unless the U-value is zero.

 

[Harry Bloomfield]

I asked you to demonstrate heat transfer through a robustly insulated cavity wall, during a regular hot day scenario. I'd like to see this 'inevitable' heat through the insulation you blathered about.

That I did, more than adequately, with coloured pictures. The inevitable heat rise, shows in the yellow line, but only for those who would see. Should I try crayons next?

 

[motorbiking]

Not only does it happen, there is a formula for calculating it.

 

[MNW67]

The fact that you keep using the phrase robustly insulated cavity wall, shows you haven't a clue.

What is wrong with using the word robustly. It is not a word I would have chosen myself. But why are you making such a big deal about that word specifically.

 

[MNW67]

The inevitable heat rise, shows in the yellow line, but only for those who would see.

Surely, that heat could be coming through the window glass and be unrelated to the effects of insulation?

 

[noseall]

You are still demonstrating a complete lack of understanding of the subject.

Nonsense

The fact that you keep using the phrase robustly insulated cavity wall, shows you haven't a clue.

Because slackers leave bits out.

Why do you think in hot countries they don't insulate the roof? Insulation slows heat transfer, it does not stop it, unless the U-value is zero.

We are talking about UK scenarios dummy.

 

[motorbiking]

What is wrong with using the word robustly. It is not a word I would have chosen myself. But why are you making such a big deal about it.

What is the U value of a robustly insulated wall?

Surely, that heat could be coming through the window glass and be unrelated to the effects of insulation?

Insulation is a meaningless term unless it is expressed in terms of thermal transmittance.

If you built a box out of 2 x 100mm PIR, it has an extremely low thermal conductivity of 0.02
pop a thermometer inside and leave your box out in 30 degree sun. The temperature will rise and when the sun goes down and the air outside cools it will also cool.

If you repeat the test with 1 x 10mm PIR it has a much higher thermal conductivity of 0.75 The temperature will rise and fall much faster than the first box.

Unless your "insulation" has thermal conductivity of 0, thermal transfer will occur, until the temperature outside is the same as the temperature inside.

If you have more hours of hot than hours of cold, guess which box will be cooler?

 

[motorbiking]

Nonsense

Because slackers leave bits out.

We are talking about UK scenarios dummy.

So 30 degree heat in the UK is different to 30 degree heat in another country? wow.

 

[Harry Bloomfield]

Surely, that heat could be coming through the window glass and be unrelated to the effects of insulation?

Of course, which was why I mentioned that, plus human activity, and use of appliances in the home, in my post #351. However, even without those effects, no windows, no humans, no appliances running - heat and cold will still seep through the insulation, no matter 'how robust' the insulation installed, it will, without any doubt seep through - basic physics, which most learn, as five-year-olds.

 

[motorbiking]

Of course, which was why I mentioned that, plus human activity, and use of appliances in the home, in my post #351. However, even without those effects, no windows, no humans, no appliances running - heat and cold will still seep through the insulation, no matter 'how robust' the insulation installed, it will, without any doubt seep through - basic physics, which most learn, as five-year-olds.

If only engineers could come up with, say a universal way of calculating and measuring this concept... oh wait they have.

 

[Harry Bloomfield]

Nonsense

Because slackers leave bits out.

We are talking about UK scenarios dummy.

The difference is what exactly? The laws of physics, don't stop at the UK's borders, last time I checked - dummy!

 

[Harry Bloomfield]

If only engineers could come up with, say a universal way of calculating and measuring this concept...

I know, let's call it a U value

 

[MNW67]

What is the U value of a robustly insulated wall?

That is just another stupid gotcha question.