Evaporative Air Conditioning

Air conditioning and refrigeration are provided by the removal of heat. The definition of cold is the absence of all heat and air conditioning systems work on this basic principle. Heat can air be eliminated by the process of radiation, convection and conduction using mediums such as water, air, ice and chemicals referred to as refrigerants. To remove heat from something, you simply provide a medium that is colder, that's how all air conditioning and refrigeration systems work.

An air conditioning system, or air-conditioning unit, provides cooling, ventilation and humidity control for all or part of a house or building. The refrigerant allows cooling by a process called the refrigeration cycle. The refrigeration cycle consists of four essential elements to create a cooling effect. A compressor compression system. This compression causes the cooling vapor to heat. The compressed steam is then cooled by heat exchange with the outside air, so that the steam condenses into a liquid in the condenser. The fluid is then pumped inside the building, where it enters an evaporator. In the evaporator, small spray nozzles spray the cooling fluid in a chamber, where pressure drops and the liquid evaporates. Since the evaporation of cooling absorbs heat from the environment, the surroundings cool off, and thus the evaporator absorbs or adds heat to the system. The steam is then returned to the compressor. A measuring device acts as a restriction in the system at the evaporator to ensure that the heat absorbed by the system is absorbed at the proper rate.

mainframes, "all air" air conditioning are often installed in modern residences, offices and public buildings, but are difficult to renovate (installed in a building that has not been set up for accommodating) ducts because air bulky required. A duct system must be carefully maintained to prevent the growth of pathogenic bacteria in the ducts. An alternative to large ducts of air conditioning to make the air to heat or cool an area is the use of remote fan coils or distribution systems. These systems, although most often seen in residential applications, are gaining popularity in small commercial buildings. The coil is connected to a remote condenser using piping instead of ducts.

Dehumidification in an air conditioning system is provided by the evaporator. Since the evaporator operates at a temperature below the dew point, moisture is collected at the evaporator. This moisture is collected at the bottom of the evaporator in a condensate pan and removed by piping to a central drain or on the ground outside. A dehumidifier is an appliance-like air conditioning that controls the humidity of a room or building. They are often employed in basements which have a higher relative humidity because of their lower temperature (and propensity for damp floors and walls). In establishments retail food, large closets open cooling are very effective for dehumidification of indoor air. Conversely, a humidifier increases the humidity of a building.

air-conditioned buildings often have sealed windows, because open windows would disrupt the attempts of the HVAC system to maintain constant indoor air conditions.