Name: 自己消火型の木造建築物：気候変動の解決策は？| カルメン・ゴルスカ・プティンスカ｜TEDxUQ (Self-extinguishing timber buildings: a climate change solution? | Carmen Gorska Putynska | TEDxUQ)
Uploaded: 2021-01-14T10:35:44.000Z
Duration: 15 min 47 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Each of us who lives in the house apartment of skyscraper has a carbon footprint.

We work in a building or studying a building, and then we do groceries in another building.

程度の副詞

So many buildings in our lives see, these are like concrete jungles, and they have become our new natural habitat.

We use millions of tons of steel and concrete toe build that jangles on the production of steel and concrete requires so much energy that it consumes 40% off the total energy consumed worldwide.

Living behind a nervous amount off carbon dioxide.

This puts the building industry on top of the list of the most polluting human activities on the population is still growing.

Each year there is 80 million more of us, so more housing is needed more steel and concrete to build that housing.

But now imagine if we could turn this polluting industry into the cleanest one or even better, imagine if we could turn this polluting industry into one that could reverse climate change.

Maybe, maybe it's time to start using a list contaminating material, maybe theme Burr.

Today we have the technology to blue timber planks.

We can obtain high strength beams, slaps arches from a structural prospective timber is super strong on.

Norway has just finished the tourist timber building in the world with 18 stories.

These opens great opportunities for developing countries.

So strong, cheap on beautiful, so many benefits, but still the biggest bonus if the sustainability off timber.

As you know, when trees grow there, remove carbon dioxide from the atmosphere on there with an oxygen in exchange.

Then trees use this carbon to produce wood and keep growing.

This means that the polluting carbon from the atmosphere is no looked within the tree trunk.

Forests sequester the most carbon during the growing stage.

Once a force is mature, the cycle slows down.

So ideally, we would liketo have continuously growing forests.

We shoot harvest mature trees for construction purposes.

On fill the empty spaces with young trees these way, infrastructures can be seen like enormous carbon storage is the atmosphere could be gone to hell on the building industry could find its path towards a sustainable future.

Steamer skyscrapers sounds like a fantastic, innovative solution to many off our human problems.

We love innovation, not like any other innovation.

It comes with some here and consequences.

For example, everybody thought that plastic was out great material 50 years ago, but finding in our food or smartphones for is your lives.

But sometimes they explode in airplanes, Dembo skyscrapers for climate change cuffs.

So after saying these, you can guess who I am.

We can't just build Kimber skyscrapers like this.

That would be a disaster, and I really don't want to be the knowing one who puts a break on innovation.

If we have timber as our fuel on oxygen, which we have in air, we just need a small spark to start a combustion reaction where the folks you do reacts with the timber and the products off any combustion reaction are flames carbon dioxide on water, carbon dioxide.

This means that I got timber structure burns.

All the carbon that was stored within the structure is sent back.

So the atmosphere not to mention that fire challenges life safety.

We don't want to send the occupants of timber building to the atmosphere as well.

So if a timber building burns, our carbon footprint is as big as before.

We have to make sure that we don't convert them in tow us on that.

Let's have hell upon this as a fire safety engineer.

This is what I see when I look at our single house a compartment when there is a fire inside this compartment the fire safety evacuation strategy looks like this inside.

In sample we are out way before the fire gets dangers.

These what I see when I look at the high rise buildings, lots of compartments stucked on top of each other, connected with us, darkest the produce.

That's the gets tricky, working down 20 stories.

Imagine if you had any surgery after playing soccer and maybe we're carrying.

These gifts Ah, lot off time for the fire to grow the uncontrollable dimensions on, even to spread into the staircase where the people are evacuating to prevent that, we have the strategy off containing the fire in the compartment where it started.

Actually, we have toe design buildings in such a way that the fire can't spirit.

This is because, ah, hire a structure can withstand losing one of this compartment.

But if we lose more of this game over to keep the fire in one compartment, it's called compartment ation.

Strategy compartment ation makes you that if I were not spread through the building, its prevalence structure collapse.

But most important, compartment ation makes sure that the staircase, the evacuation paper, is going to be free from smoke and hit, giving people all the time.

They need to evacuate the high rice in one sentence compartment.

Ation is critical for fire safe, high rise buildings for steel and concrete buildings.

This is doable, but how on earth we achieve compartment patient If the compartment itself, the floor, the walls, the ceiling is timber and it burns.

How this timber burn way the way timber doesn't burn at high temperatures.

Timber, They're composes part of the timber.

The composer's into char, which forms a char layer under remaining part the composer's into flammable gases.

The flammable gases flow out of the timber, mixed with oxygen and react.

So when we see flames, it is not timber burning, but only the global gas is reacting with the oxygen.

All these magics happens in the composing layer, which moves like a front, because once it's done here, it moves deeper into the chamber to keep converting more and more timber into char and cannibal gases.

But this the composing front needs to be hot.

It needs energy to be able to transform timber into child cannibal gases.

On it receives this energy from its own flame are the surface that sneaky nature has already decided some time ago that the chair layer is going to be an excellent insulator, which means that it stops the hit from going through, and after some time we built a pretty picture layer.

So now we have a really good insulate er the figure the char layer less unless heat from the flame kind of reach that the composing front.

So the composing from doesn't have the energy to keep transforming more timber into charm trouble gases.

So the production of the probable gases stops.

If there is no more flammable gases, no more fuel to heat the flame so the flames starts to get smaller and smaller, and eventually it extinguishes all by its own.

This is what we call so extinguishment off timber.

These whole nature has designed trees to withstand raging wildfires by forming this protective travel air as long as the trees thick enough there will be in that healthy would remaining when the flame extinguishes for the tree to survive on.

As long as a timber member is thick enough, this structure can't be stunned.

The charring off the outer layer while the fired exiled.