Air conditioning definition: 1. the system used for keeping the air in a building or vehicle cool: 2. a system for cooling a room, building, or vehicle3. the electrical. It refers to the process of conditioning the interior air according to the human comfort. The vital factors that influence human comfort are Temperature (21°C to. The state of temperature and humidity produced by an air conditioner. An air conditioner or system of air conditioners. This car has air conditioning.


Author: Alexanne Yundt
Country: France
Language: English
Genre: Education
Published: 13 November 2017
Pages: 67
PDF File Size: 40.22 Mb
ePub File Size: 39.79 Mb
ISBN: 719-4-35677-428-7
Downloads: 94313
Price: Free
Uploader: Alexanne Yundt


By running an air conditioner's compressor air conditioning definition the opposite direction, the overall effect can be completely reversed and the indoor area will become heated instead of cooled see heat pump.

Air conditioning - definition of air conditioning by The Free Dictionary

The engineering of physical and thermodynamic properties of gas—vapor mixtures is called psychrometrics. Heat pump unit[ edit ] Main article: Heat pump An example of an externally fitted AC unit which uses a heat pump system A heat pump is an air conditioner in which the refrigeration cycle can be reversed, producing heating instead air conditioning definition cooling in the indoor environment.

They are also commonly referred to as a air conditioning definition cycle air conditioner". The heat pump is significantly more energy efficient than electric resistance heating. Some homeowners elect to have a heat pump system installed as a feature of a central air conditioner.


When the heat pump is in heating mode, the air conditioning definition evaporator coil switches roles and becomes the condenser coil, producing heat. The outdoor condenser unit also switches roles to serve as the evaporator, and discharges cold air colder than the ambient outdoor air.


This is because ice forms on the outdoor unit's heat exchanger coil, which blocks air flow over the coil. To compensate for this, air conditioning definition heat pump system must temporarily switch back into the regular air conditioning mode to switch the outdoor evaporator coil back to being the condenser coil, so that it air conditioning definition heat up and defrost.

A heat pump system will therefore have a form of electric resistance heating in the indoor air path that is activated only in this mode in order to compensate for the temporary indoor air cooling, which would otherwise be uncomfortable in the winter.

The icing problem becomes much more severe with lower outdoor temperatures, so heat pumps are commonly installed in tandem with a more conventional form of heating, such as a natural gas or oil furnacewhich is used instead of the heat pump during harsher winter temperatures.

In this case, the heat pump is used efficiently during the milder temperatures, and the system is switched to the conventional heat source when the outdoor temperature is air conditioning definition. Absorption heat pumps are a kind of air-source heat pump, but they do not depend on electricity to power them.

Instead, gas, solar power, or heated water is used as a main power source. An absorption pump dissolves ammonia gas in water, which gives off heat.

Next, the water and ammonia mixture is depressurized to induce boiling, and the ammonia is boiled off, which absorbs heat from the outdoor air conditioning definition.

Air conditioning

However, a window unit may only have an electric resistance heater. Evaporative cooler An evaporative cooler In very dry climates, evaporative coolers, sometimes referred to as swamp coolers or desert coolers, are popular for improving coolness during hot weather. An evaporative cooler is air conditioning definition device that draws outside air through a wet pad, such as a large sponge soaked with water.

The sensible heat of the incoming air, as measured by a dry bulb thermometer air conditioning definition, is reduced. The temperature of the incoming air is reduced, but it is also more humid, so the total heat sensible heat plus latent heat is unchanged.

Some of the sensible heat of the air conditioning definition air is converted to latent heat by the evaporation of water in the wet cooler pads.


If the entering air is dry enough, the results can air conditioning definition quite substantial. Evaporative coolers tend to feel as if they are not working during air conditioning definition of high humidity, when there is not much dry air with which the coolers can work to make the air as cool as possible for dwelling occupants.

Unlike other types of air conditioners, evaporative coolers rely on the outside air to be channeled through cooler pads that cool the air before it reaches the inside of a house through its air duct system; this cooled outside air must be allowed to push the warmer air within the house out through an exhaust opening such as an open door or window.

Free cooling Air conditioning can also be provided by a process called free cooling which air conditioning definition pumps to circulate a coolant typically water or a glycol mix from a cold source, which in turn acts as a heat sink for the energy that is removed from the cooled space. Common storage media are deep aquifers or a natural underground rock mass accessed via a cluster of small-diameter boreholes, equipped with heat exchanger.

Air conditioning - Wiktionary

Some systems with small storage capacity are hybrid systems, using free cooling early in the cooling season, and later employing a heat pump to chill the circulation coming from the storage. The heat pump is added air conditioning definition the temperature of the storage gradually increases during the cooling season, thereby declining its effectiveness.

Free cooling systems can have very high efficiencies, and are sometimes combined with seasonal thermal energy storage STES so the cold of winter can be air conditioning definition for summer air conditioning.