air conditioner
R-11 and R-12 are no longer manufactured in the United States, the only source for purchase being the cleaned and purified gas recovered from other air conditioner systems. [1]
An air conditioner (often referred to as AC or air con.) is an appliance, system, or machine designed to stabilise the air temperature and humidity within an area (used for cooling as well as heating depending on the air properties at a given time), typically using a refrigeration cycle but sometimes using evaporation, commonly for comfort cooling in buildings and motor vehicles. [2]
Older air conditioning systems relied upon a water supply to cool either the machinery or the air, but around 1932 engineers at the De La Vergne Machine Company developed the air-cooled compressor, which freed air conditioning from its plumbing connections and accelerated the development of the air conditioner as a discrete plug-in appliance. [3]
Since evaporation occurs when heat is absorbed, and condensation occurs when heat is released, air conditioners are designed to use a compressor to cause pressure changes between two compartments, and actively pump a refrigerant around. [4]
The competitiveness of the industry has increased with demand, and there are many companies providing air conditioning units and systems. [5]
The concept of air conditioning is known to have been applied in Ancient Rome, where aqueduct water was circulated through the walls of certain houses to cool them. [2]
In construction, a complete system of heating, ventilation, and air conditioning is referred to as HVAC. [4]
Franklin and Hadley confirmed that evaporation of highly volatile liquids such as alcohol and ether could be used to drive down the temperature of an object past the freezing point of water. [5]
An air conditioner (often referred to as AC) is a home appliance, system, or mechanism designed to dehumidify and extract heat from an area. [1]
The low heat and humidity were to help maintain consistent paper dimensions and ink alignment. [2]
Comfort air conditioning refers to control of spaces to promote the comfort, health, or productivity of the inhabitants. [3]
An air conditioner is a system, or machine that removes heat from an area using a cycle in which heat is moved out of the area where it is hot. [4]
This evaporation of water in air, to provide a cooling effect, is now known as evaporative cooling. [1]
As the working fluid or refrigerant circulates through the air-conditioning system at high pressure via the pump, it will enter an evaporator where it changes into a gas state, taking heat from the opposing fluid medium and operating just like a heat exchanger. [5]
Control of temperature, humidity, purity, and motion of air in an enclosed space, independent of outside conditions. [3]
Sources:
[1] Air conditioner - Wikipedia, the free encyclopedia
[2] Air conditioning - Wikipedia, the free encyclopedia
[3] air conditioning: Definition from Answers.com
[4] Air conditioner - Simple English Wikipedia, the free encyclopedia
[5] air conditioner: Definition from Answers.com