Post on 30-Dec-2015
description
“ALL OR NOTHING”
A simple look at
Domestic Air-conditioning
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.
In 1902, the first modern electrical air-conditioning unit was invented by Willis Haviland Carrier in Buffalo, New York,
after graduating from Cornell University.
SPLIT - TYPE
1 piece WINDOW - TYPE
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.
Squeezing a gas
causes it to get HOT
Lowering the pressure
causes it to COOL
Where should you place the two parts of a
‘SPLIT – TYPE’ air-con?
First the outside unit.
(Condenser)
The air-con will probably be used at night in a
bedroom.
Do NOT place the outside unit under the window!
Try not to place in direct mid-day sun.
Try to place on a solid wall with no window.
After all this, place as close to the inside unit
as possible. The shorter the pipe, the better the
result.
Where should you place the inside unit of a
‘SPLIT – TYPE’ air-con?There are two types of
indoor unit, WALL & FLOOR.
(Evaporator)
Hot air rises
Cooling air falls
De-Humidifying
The art of drying air
Hot air can hold a lot of moisture.
Cold air cannot hold as much moisture.
SPLIT - TYPE
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?
SPLIT - TYPE
Two pipes carry gas to and from the indoor unit.
One pipe carries the water from the moist air to the outside
world
SPLIT - TYPE
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.
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!
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.
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.
The first non-flammable, non-toxic chlorofluorocarbon gas, Freon, in 1928.
Chlorofluorocarbon (CFC) Hydrochlorofluorocarbon (HCFC)
Hydrofluorocarbon (HFC) refrigerant
DuPont
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.
Why
“ALL OR NOTHING”
THE END
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