Presentation on theme: "ALL OR NOTHING A simple look at Domestic Air-conditioning."— Presentation transcript:
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.appliancesystem machinerefrigeration cycleevaporation 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.inventedWillis Haviland CarrierBuffalo, New YorkCornell University
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. refrigerators ammoniamethyl chloride propane
The first non-flammable, non-toxic chlorofluorocarbon gas, Freon, in 1928.Freon ChlorofluorocarbonChlorofluorocarbon (CFC) Hydrochlorofluorocarbon (HCFC) Hydrofluorocarbon (HFC) refrigerantHCFC Hydrofluorocarbon 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.