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This cooled liquid flows through pipes in a building and passes through coils in air handlers, fan-coil units, or other systems, cooling and usually dehumidifying the air in the building. Chillers are of two types; air-cooled or water-cooled. Air-cooled chillers are usually outside and consist of condenser coils cooled by fan-driven air.
The result of this is that capacitive and inductive circuit elements tend to cancel each other out. [4] The Power Triangle The complex power is the vector sum of active and reactive power. The apparent power is the magnitude of the complex power. Active power, P Reactive power, Q Complex power, S Apparent power, |S|
The first residential AC was installed by 1914, and by the 1950s there was "widespread adoption of residential AC". [ 13 ] The invention of the components of HVAC systems went hand-in-hand with the Industrial Revolution , and new methods of modernization, higher efficiency, and system control are constantly being introduced by companies and ...
AC power Electric power where the current reverses direction periodically. AC-to-DC conversion (rectifier) Rectification of AC current, so that current flows in only one direction. AC-to-AC converter A power converter where the input and output are both alternating current, but may differ in frequency or other characteristics. AC/DC receiver design
These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.
A schematic representation of long distance electric power transmission. From left to right: G=generator, U=step-up transformer, V=voltage at beginning of transmission line, Pt=power entering transmission line, I=current in wires, R=total resistance in wires, Pw=power lost in transmission line, Pe=power reaching the end of the transmission line, D=step-down transformer, C=consumers.
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Typical room electrical fans consume 50 to 100 watts of power, while air-conditioning units use 500 to 4000 watts; fans use less electricity but do not cool the air, simply providing evaporative cooling of sweat. Commercial fans are louder than AC units and can be disruptively loud.