Refrigerator

The Refrigertor

• 
• Caption: An important invention

Slide 2

• The refrigerator is something that us can use commonly but... what is the origin of this important machine?
• Surely you have a refrigerator and use this for keep your food in good condition. Is something very common in our lifes but ... can you imagine the first refrigerator or maybe in what year it was built?
• Let's talk about it! (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

Slide 3

• The first
• data about, how to save ice is from
• China in the century XI B.C. Marco
• Polo told us, how chinese people did ice cream after that, the indians, greeks and
• romans adopted this custom.
• 

Slide 4

• Alejandro
• Magno said: "crash the ice from the mountains and carry up by relay, when you had arrived put it in caves”
• Greeks
• carried up ice from Mount Olympus to
• refresh their wines.
• In America people did pots where
• they put the meals, and they dug a hole
• in the ground near their home and cover these pots
• 

Slide 5

• Before mechanical refrigeration systems were introduced, people cooled their food with ice and snow, either found locally or brought down from the mountains.
• The first cellars were holes dug into the ground and lined with wood or straw and packed with snow and ice
• 

Slide 6

• 
• In Spain the first container to
• save ice was a Wooden box. This ice was carried up by horses from
• faraway places.
• In 1871, Kart Von Linde, got an advance
• about frozen tecnics, he did a machine, it used
• ether and ammonia for refrigerating.
• This invention was sold by Kelvinator,
• this box had a compressor that froze the water with ammonia.

Slide 7

• The first refrigerators were bulky and uncomfortable even with used the toxic gases ammonia (NH3), methyl chloride (CH3Cl), and sulfur dioxide (SO2) as refrigerants.
• Several fatal accidents occurred in the 1920s when methyl chloride leaked out of refrigerators.
• 

The origins

• Inventors
• The next map show us differents inventors and their contributions through time

Slide 9

• Today, the refrigerator is the most used appliance in the world and is present in almost every household in developed countries. It is definitely one of those "miracles" of modernity that can totally change your life.
• 

Slide 10

• How does the actual refrigerator
• work?
• The refrigerator has refrigerant,
• which is a gas.
• This gas is liquid,
• when this liquid evaporates,
• absorbes hot into the refrigerator.
• This chemical ebulles
• to environmental temperature
• When the refrigerant is steam, the compressor sends it into the refrigerator
• , and the steam absorbes hot, after that this gas returns to the compressor,
• it gets free hot in the kitchen
• The refrigerant is liquid again, and the cycle stars
• over again.
• The cold is absence of hot

Modern Refrigerators

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