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HVAC (heating, ventilation, and air conditioning) is a major sub discipline of mechanical engineering. The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease of maintenance, and energy efficiency. The discipline of HVAC includes a large number of specialized terms and acronyms, many ...
In 1965, Liebert founded Liebert Corporation as the first manufacturer air conditioning units with temperature and humidity controls specific for computer room applications. [3] In 1977, Liebert launched Conditioned Power Corporation to design and manufacture power distribution, conditioning and monitoring systems for the data processing industry.
Warm air systems distribute the heated air through ductwork systems of supply and return air through metal or fiberglass ducts. Many systems use the same ducts to distribute air cooled by an evaporator coil for air conditioning. The air supply is normally filtered through air filters [dubious – discuss] to remove dust and pollen particles. [15]
If the supply current is redirected downstream into the third (ground) circuit conductor (e.g., if the grounded metallic case of a power tool contacts a 120-volt conductor), or into earth ground (e.g., if a person contacts a 120-volt conductor), the neutral return current will be less than the supply current, resulting in a positive net current ...
Vertiv is an American multinational provider of critical infrastructure and services for data centers, communication networks, and commercial and industrial environments. ...
The company took the name American Building Maintenance in 1913 and acquired Easterday Janitorial Supply Company in 1927. [7] In the 1920s and 1930s, ABM grew its business on the West Coast by offering annual cleaning contracts to businesses.