“all or nothing”
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“ALL OR NOTHING”. A simple look at Domestic Air-conditioning. - PowerPoint PPT PresentationTRANSCRIPT
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“ALL OR NOTHING”
A simple look at
Domestic Air-conditioning
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An air conditioner (often referred to as AC or air con) is an appliance, system, or
machine designed to change the air temperature and humidity within an area typically using a refrigeration cycle but
sometimes using evaporation, commonly for comfort cooling in buildings and motor
vehicles. There may even be a heating cycle.
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In 1902, the first modern electrical air-conditioning unit was invented by Willis Haviland Carrier in Buffalo, New York,
after graduating from Cornell University.
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SPLIT - TYPE
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1 piece WINDOW - TYPE
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Squeezing gas causes it to get HOT, lowering the pressure causes it to
COOL.
***
Hot air rises - cooling air falls.
***
Hot air can hold a lot of moisture.
Cold air cannot hold as much moisture.
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Squeezing a gas
causes it to get HOT
Lowering the pressure
causes it to COOL
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Where should you place the two parts of a
‘SPLIT – TYPE’ air-con?
First the outside unit.
(Condenser)
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The air-con will probably be used at night in a
bedroom.
Do NOT place the outside unit under the window!
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Try not to place in direct mid-day sun.
Try to place on a solid wall with no window.
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After all this, place as close to the inside unit
as possible. The shorter the pipe, the better the
result.
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Where should you place the inside unit of a
‘SPLIT – TYPE’ air-con?There are two types of
indoor unit, WALL & FLOOR.
(Evaporator)
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Hot air rises
Cooling air falls
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De-Humidifying
The art of drying air
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Hot air can hold a lot of moisture.
Cold air cannot hold as much moisture.
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SPLIT - TYPE
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If you blow hot, wet air against a cold metal box the air cannot
hold the moisture and it will fall as water.
Where does the water go?
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SPLIT - TYPE
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Two pipes carry gas to and from the indoor unit.
One pipe carries the water from the moist air to the outside
world
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SPLIT - TYPE
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If indoor unit is out of reach, a remote control is
required.
These days they can be very complex with many useful
cycles of operation.
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If long periods of inactivity occur, run air-con for about 10 mins every 3 or 4
weeks. Any rubber or synthetic material will degrade over time and can cause
gas to escape.
NO GAS = NO WORK!
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Later Air-conditioners use a more complex compressor control unit
Inverter Controlled Compressor Motors
This allows a variable motor speed and a variable temperature ‘cold-box’.
Much better control of temperature.
More expensive.
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The first air conditioners and refrigerators employed toxic or
flammable gases, such as ammonia, methyl chloride, or
propane, that could result in fatal accidents when they leaked.
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The first non-flammable, non-toxic chlorofluorocarbon gas, Freon, in 1928.
Chlorofluorocarbon (CFC) Hydrochlorofluorocarbon (HCFC)
Hydrofluorocarbon (HFC) refrigerant
DuPont
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Squeezing gas causes it to get HOT, lowering the pressure causes it to
COOL.
***
Hot air rises - cooling air falls.
***
Hot air can hold a lot of moisture.
Cold air cannot hold as much moisture.
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Why
“ALL OR NOTHING”
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THE END
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