Air conditioning generates heat?
heat exchange, the heat generated is the heat removed from the cooled down area transfered through the refrigerant liquid being pumped around the air con system
An air conditioner is a heat pump. What it basically does is to suck heat in (in the room) and throw it out where the radiator is (probably outside). To do this it uses some source of energy. The conversion of this energy is not 100% efficient. So there is some heat generated (in addition to the heat that is pumped away) For the same reason, you can't cool a room by opening your fridge or running a ceiling fan.
Air conditioning is a thermal process wherein heat flows from a lower temperature (air conditioned or cold room) to a higher temperature (hot room or outside atmosphere). So the heat that is removed from the cold room is rejected to the hot room. Normally in thermal processes heat flows from higher temperature to a lower temperature and is used many a times to do work, like in a gas turbine. Since it is not natural for heat to flow from colder temperature to hotter temperature we need to provide energy in the form of work done (eg. Compressor in an air conditioner). Now the heat removed from from the cold room plus the work done by the compressor needs to be rejected into the hot room. So you would find that the air conditioner generating heat.
The principles of airconditioning are all about heat transfer. An air conditioner does not really produce cold air,nor does it produce heat. It actually removes the heat from the air on one side of the device and transfers it to the other side. That is why for instance, the inside section of the window air conditioner is cooler than the outside air side. The fan on the inside draws hot air into a series of coils, that draws the heat out of that air and then expells it back out at a cooler temperature. The process has to do with the properties and pressure differentials of the refrigerant gas in the system. on the outside section, the heat that has been removed from the inside air and transferred to the outside to a set of coils, is distributed outside by another fan flowing air over those hotside coils and distributing the heat to the outdoors.
The mechanics of a refrigerating air conditioner require it to produce waste heat in order to make cold air as well. Basically an air conditioner applies the general gas law of PV=nRT where: P=pressure V=volume n=number of moles R=the gas constant T=temperature Basically the law states that when the pressure of a gas is decreased, it gets colder because there is a direct relationship between the temperature and the pressure of any gas. Air conditioners basically utilise a compressor-pump assembly filled with a very compressible gas. The cooling effect is produced by decompressing the gas and sending the chilled gas through a heat exchanger. The heat exchanger is a screen of small tubes that normal air is blown through by a fan. The air gets cold because of contact with the chilled heat exchanger. These air conditioners are far more energy efficient and do not produce the large amounts of waste heat that refigerated systems do because the basically there is only a fan to move the air and no energy hungry compressor machinery to power. The compressor machinery produces heat as a by-product of it being an electrical machine in motion and the compression stage of the gas inside. The compression stage is required in order for the decompression stage to be possible. Obviously, this produces heat which is dumped outside the airconditioner (and the area being cooled) which is why you will feel a lot of heat coming from it if you are close. The whole process is energy intensive due to the compressor and the fan to drive air through the system. This is why refrigerated air conditioning is a very high consumer of electrical power. Evaporative airconditioners utilise the phase-shift effect to reduce temperature. When water shifts from being a liquid to a vapour, it requires a lot of energy. The energy is heat. Air is cooled by stealing the heat energy from it to make water evaporate. That is why evaporative air conditioners are often referred to as heat pumps.
