B1 Intermediate US 106 Folder Collection
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The Internet, French fries, and air conditioning – these are my personal top three human
inventions of all time.
Oaky let's add indoor plumbing…
Now I have a basic idea of how the first two things on the list work, but what about the
What makes it as awesome as it is?
Believe it or not, but you have to thank mosquitoes for the invention of air conditioning, or,
at least, its forefather!
No one loves them in the 21st century, but back in the 19th those guys were a real nightmare.
They carried around different infections, such as malaria.
Things were especially bad in swampy areas of Florida.
A local physician and inventor Dr. John Gorrie was trying to find a way to drain the swamps,
and while he was at it, he got this revolutionary idea in 1841.
He realized the problem was literally in the air.
So cooling the air could fix it!
Dr. Gorrie arranged shipping of buckets of ice from frozen lakes and streams in the North
of the country into hospital rooms in Florida.
It worked, but was super challenging logistically, so he came up with a new idea.
By 1851, he designed an air compressor to make ice out of water.
The mechanism was powered by a horse.
This is how the concept of air conditioning was born!
It does have a lot in common with the ACs of today.
Well, at least the basic idea is the same.
A few decades later, engineer Willis Carrier was helping a publishing company to stop magazine
pages form wrinkling because of humidity.
He designed the first electrical air conditioning unit with cooling coils and air filters.
He used cold water as a coolant first, and then installed an ammonia compressor in his
Carrier realized it was not only good for magazines, but to humidify or dehumidify room
air as well.
He patented the invention and started his own Carrier Engineering Corporation in 1915.
Air conditioning made its first mass public appearance at the St. Louis World's Fair in
The 1,000 people in the auditorium definitely loved the idea of comfort cooling.
In the 1920s, it became a basic need for thousands of people that rushed to movie theaters to
watch their favorite Hollywood stars on the big screen.
They came up with an unusual solution and decided to modify heating systems to send
cold air through floor vents.
But now the lower levels were freezing and upper levels still felt too hot.
It required a few adjustments, but in the end they fixed the issue and Metropolitan
Theater in Los Angeles got the first perfect public air conditioning system.
It was good enough for public buildings, but still too large and expensive for homes.
It took a couple more decades for engineers to design something perfect for private houses.
By 1947, they sold 43,000 systems, and now the AC is present in hundreds of millions
of homes across the world.
Today's air conditioners work on the principles of Carrier's invention but are, of course,
more energy efficient, much quieter, have way better diagnostics and controls, electronic
sensors and are made of better materials.
What they do is transport heat energy from the house outdoors.
It changes the temperature inside, makes air more humid and improves its quality.
It has 2 basic parts, or units: the outdoor unit and the indoor unit.
There are 2 possible scenarios: you can have either a room air conditioner or a central
air conditioner.
The way they work is basically the same, except if you have central air conditioning, there
is just one indoor unit and one outdoor unit.
If you have room air conditioning, it's in every room, or the rooms you believe to be
of most importance and you decide to spend money on keeping them cool.
I will tell you about the central air conditioner type because that's what I have.
So, let's go outside to check out the outdoor unit.
It differs model to model and brand to brand, but in general it looks like a box with a
fan in the rear or the side of your house.
In larger apartment or office buildings, these boxes flock together like birds, except they
aren't that cute.
The outdoor unit consists of a compressor, condenser coil and a fan.
Another vital player in this process is the refrigerant.
It travels through the whole system, connects the outside unit to the inside unit, and is
technically not a detail but a cooling fluid.
The heat from the air inside your home mixes with the refrigerant and moves through the
compressor and to the outdoor coil.
One cool thing about the refrigerant is that it can go from liquid to vapor state.
The same refrigerant is used more than once – the compressor works like a pump that
keeps moving it back and forth through the whole system.
It gets compressed and then moves through the condenser coil.
It's important to squeeze the gas tightly because the higher the pressure, the higher
the temperature.
It has to be done to make the refrigerant hotter than the air outside.
Heat naturally moves from hotter to colder bodies.
The outside air gets in the condenser coil through the fan.
The hot air from your house disperses into street air.
The refrigerant has just successfully done its job.
It cools down, turns into gas again and goes back inside and the process continues and
goes on and on.
So it's clear now what happens outside, but what about the indoor unit?
Let's get back into the house and find it.
So, there can be an indoor unit in every room of your house, or the ones you need to keep
cool, or one unit in the closet or the basement, or or somewhere inside your house.
To make it work all over the house, there is also a thermostat, and supply and return
air vents.
The indoor unit itself is a coil box that has the blower motor right here, the evaporator
coil, the expansion valve, the circuit board and the filter.
When it gets too hot in the room, the thermostat sends an SOS signal to the circuit board.
It turns on the blower motor.
The hot air from the room is sucked in through the return vents.
Then, the air meets the refrigerant.
At this stage, the hot air loses its heat and moisture.
But because the cooler takes in the heat it becomes so hot it's not ready to meet the
evaporator coils yet.
The expansion valve helps it blow off some steam and lose some extra pressure.
Then the refrigerant goes from liquid to gas and is ready to move over the ice cold evaporator
The cold refrigerant is moving through little tubes that evaporator coil is made of.
Now, let's give the refrigerant some time to absorb enough heat from the indoor air.
And done, it's ready to move to the compressor, and you know what happens there in the outdoor
All this is going on at the same time and in a never-ending cycle.
Well, until the thermostat decides the temperature is okay, and shuts it down before it gets
hot inside again.
Then, it starts over, the heat goes out, and the cold air comes in.
It spreads across the house through the supply vents.
Each and every detail in the air conditioner is super important, and even if one of them
goes off, the whole process will stop.
And I deeply hope it won't as it's getting hot in here.
So you see air conditioners have gone a long way to become as efficient as they are today.
But progress never stops, and scientists are working on new technologies to make the ACs
more energy-efficient, eco-friendly and better looking both on the inside and the outside
of the house.
Hey didn't that send a chill down your spine?
Hey, if you learned something new today, then give the video a like and share it with a
And here are some other cool videos I think you'll enjoy.
Just click to the left or right, and stay on the Bright Side of life!
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AC Was Invented Because of Mosquitoes

106 Folder Collection
Fibby published on December 12, 2019
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