Mind blown !

[simplesteve]

So guys, I can’t get my head around this……
I’ve got several outdoor thermometers dotted around my garden ( don’t ask me why, I just do ! ). Today being very warm, I was getting an average air temperature of about 31 degrees, APART FROM a south facing red brick wall, which I’ve tied a thermometer to. At its highest today it got to 54 degrees !
Now I get thermal mass, conduction/convection, insulation and heat outputs etc, and I’ve been ‘ googling’ for the last couple of hours, but I still can’t work out in my head how a wall can INCREASE the temperature put in ?
Thoughts?

 

[Highway Man]

Is it a cavity wall

 

[MNW67]

Solar gain.

My walls were 44C yesterday according to my pointy thermometer thing.

 

[IT Minion]

So guys, I can’t get my head around this……
I’ve got several outdoor thermometers dotted around my garden ( don’t ask me why, I just do ! ). Today being very warm, I was getting an average air temperature of about 31 degrees, APART FROM a south facing red brick wall, which I’ve tied a thermometer to. At its highest today it got to 54 degrees !
Now I get thermal mass, conduction/convection, insulation and heat outputs etc, and I’ve been ‘ googling’ for the last couple of hours, but I still can’t work out in my head how a wall can INCREASE the temperature put in ?
Thoughts?

Direct sunshine gives around 1kW of heat spread over 1m^2 area. Or in other words a 1kW heater warming each square meter that light falls on.

That heat will spread to the surrounding air, anything behind the object or radiate away as IR light. Shedding heat is quite hard, the hotter the object is than it's environment the more effective it is at shedding the heat.

It seems your wall needed to be 23 degrees hotter than the surrounding environment before the heat provided by the sun was the same as the heat convected away by air, transferred to whatever is behind the wall or radiated as IR light.

 

[Harry Bloomfield]

There is air temperature, measured in the shade, which is the figure which is normally quoted, then there is the temperature of surfaces, upon which the sun falls and then can get much hotter, due to solar gain, from the infra-red radiation of the sun.

 

[Jurassicspark]

You're measuring the surface environment’s effect on the thermometer, not just the air temp

Think of placing a thermometer on the dashboard in a car on a 35C day.

What temperature will it show?

 

[simplesteve]

Thanks for the replies. It's not a cavity wall, just a double skin red brick wall, acting as the barrier between my garden and the pavement. The air temp figure i mentioned is not in the shade, but taken from a thermometer hanging from a 12" long bracket off a fence, hence " mid air", but in full sun.
I like the 'Solar Gain' angle; that describes exactly what it is im trying to comprehend
I get ' Jurrasics' car scenario, but that's going to be with all the Windows shut, and nothing to cool down / transfer heat away from what is effectively a sealed unit..... ?

I'm getting it now though - slowly getting my head around ITminions good answer

 

[aveatry]

That's why the highest temps used to scaremonger climate change doomers are situated in concrete jungle heat islands like the Coningsby RAF air base and Heathrow airport.

 

[MNW67]

That's why the highest temps used to scaremonger climate change doomers are situated in concrete jungle heat islands like the Coningsby RAF air base and Heathrow airport.

Ross on Wye was the hottest place in this latest spell. I don't think they have an airport or airbase!

 

[ReganAndCarter]

I think the op needs to get out more.

Be sure to put some SPF on. Can't be too careful.

 

[IT Minion]

That's why the highest temps used to scaremonger climate change doomers are situated in concrete jungle heat islands like the Coningsby RAF air base and Heathrow airport.

Yeah!

The hottest temperature measured in the UK this year is in the infamous heat island of Faversham in Kent. In a field.

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The highest of all time is here: Lat: 53.093482N Long: 0.173609W, in a field next to a runway. In Lincolnshire. That's not what a heat island looks like, check it out on satellite, it's grass as far as the eye can see. It has also been there for 80 years so makes no sense for it to be dramatically changing.

Climate science deniers are so bloody lazy these days. They swallow any old bullshit and then repeat it back verbatim.

 

[simplesteve]

I think the op needs to get out more.

I think I’ve been out too much

 

[noseall]

So guys, I can’t get my head around this……
I’ve got several outdoor thermometers dotted around my garden ( don’t ask me why, I just do ! ). Today being very warm, I was getting an average air temperature of about 31 degrees, APART FROM a south facing red brick wall, which I’ve tied a thermometer to. At its highest today it got to 54 degrees !
Now I get thermal mass, conduction/convection, insulation and heat outputs etc, and I’ve been ‘ googling’ for the last couple of hours, but I still can’t work out in my head how a wall can INCREASE the temperature put in ?
Thoughts?

In the same way a shiny white surface and a dull black surface will reach different temp's even though they are arranged together on the same surface.

 

[noseall]

That's why the highest temps used to scaremonger climate change doomers are situated in concrete jungle heat islands like the Coningsby RAF air base and Heathrow airport.

If you are genuinely scared, there are people you can talk to. The S.E. does get warmer than most of the UK due to its proximity to the continent.

 

[johnny2007]

Inside my metal shed there were 63⁰ yesterday when I opened it.