How does an air cooler work?

Question

the one with cooling coil and compresser.

Answer 1

If it has a compressor, it's an AC, as opposed to an evaporative cooler.

A gas is compressed, which heats it up. The heated gas is allowed to cool outside the building back to near ambient. It is then allowed to expand, cooling off by doing so. This cools a set of coils. Air is blown by these coils cooling the air.

Answer 2

go to howstuffworks.com

Answer 3

An air cooler operates by using a Refrigeration system that  uses a low boiling temperature refrigerant.

The hot, high pressure refrigerant gas from the compressor is cooled and condensed to liquid in the compressor discharge heat exchange coils (cooled by the atmospheric air from the refrigerant cooling fan). The high pressure liquid so formed is then expanded to low pressure and increased volume and forms a cold liquid / vapour mixture. (The 'Joules-Thompson' refrigeration effect).

This is then passed to the 'Evaporator Coils' placed in the trunking of the air conditioning system. The cold, expanded, low pressure liquid exchanges heat with the warm, circulating air of the building coming from the Air Mover (Air Circulation fan of the main system).

This causes cooling of the warm air which is then circulated around the building.

The refrigerant in the evaporator coils is converted back to a low pressure, warm vapour that returns to the compressor for recompression and the above process is repeated until the system thermostat shuts it down by stopping the fridge unit and the circulation fan. The system restarts when the thermostat set point activates again.