Air conditioner

Air conditioner

AIR CONDITIONER - room cooling device. More generally, it is a conditioning device that ventilates the premises and supporting: temperature and humidity.

Modern air conditioning device is based on the heat pump, similar to domestic refrigerator. In the normal mode conditioner cools the inflow air by transferring the warm one outside. Some air conditioners are multifunctional and reverse the above mentioned process, and then warm is being transferred in the opposite direction.

History

First air cooling technologies appeared in medieval Persia. It had buildings that used cisterns and wind towers to cool buildings during the hot season: cisterns (large open pools in central courtyards, not underground tanks) collected rain water; wind towers had windows that could catch wind and internal vanes to direct the airflow down into the building, usually over the cistern and out through a downwind cooling tower. Cistern water evaporated, cooling the air in the building.

 Nineteenth century British scientist M. Faraday discovered that by pressuring some air and converting certain gases into liquid form, then allowing the liquid to evaporate the air is being cooled.

The first modern air conditioners appeared in twentieth century – Willis Hawiland Carier 1902 created an electric air conditioner for a New York printing company. This device not only cooled the premises, but also supported the low level of humidity.  1911 W. H Carrier revealed the formula of air conditioner, in 1915 established company called Carrier, that produced air conditioner for offices, subsequently adapted for home use and cars.

The term air conditioning itself used for the first time by textile engineer Stuart H.Cramer  in 1906, term  was used to describe the irrigation system.

In the first cooling systems as well as in the refrigerators poisonous gases were used (ammonia, methyl, chloride), which in case of leak could cause fatal poisoning. 1928 Thomas Midgley junior created a cooling system using Freon gas, which was not harmful to people, but harmful to the atmospheric ozone layer.

Health effects

 The benefit or damage to our body of air conditioner is ongoing topic for discussions. Some experts claim that on hot summer days is like refreshment for the body, while others consider it as potential cause for diseases. 

However, it depends on the immune system of a human being: the more immune he is, the less impact of the temperature instability it has between temperature of the office and outside. Of course, if outside temperatures reaches 30 C and more and the air conditioner cools only to 16C, such difference may harm the respiratory system of the healthiest man. 

The air conditioner must be used wisely, avoiding the excessive temperature difference, in order it would not harm eye mucous and the respiratory system. On a hot summer day it not only refreshes, but also can be the cause of catching a cold. People use the air conditioners when trying to avoid the unbearable heat and often get cold, pneumonia, damage the skin, hair.