What is the purpose of AC?
An air conditioner provides cold air inside your home or enclosed space by actually removing heat and humidity from the indoor air. It returns the cooled air to the indoor space, and transfers the unwanted heat and humidity outside.
What means AC unit?
air conditioningWhat is an AC Unit? AC or air conditioning, is the system designed to cool the air in your home. Some contractors or builders call an AC unit anything that conditions the air, hot or cold.
What is AC cooling?
Air conditioning, often abbreviated as A/C or AC, is the process of removing heat and controlling the humidity of air in an enclosed space to achieve a more comfortable interior environment by use of powered air conditioners or a variety of other methods, including passive cooling and ventilative cooling.
Do we say AC or AC?
According to Merriam-Webster Unabridged Dictionary: Air-conditioning, when used as a noun, is hyphenated. The house has air-conditioning. Air conditioner, a noun, is open.
What does AC stand for in heating?
HVAC refers to heating, ventilation, and air conditioning, whereas AC simply refers to air conditioning. AC is generally used when referring to systems that are designed to cool the air in your home.
Is AC part of heat?
There's the A/C unit, which does the cooling, and the furnace, which does the heating. Together, the two units—and everything that goes along with them—are known as the heating, ventilation, and air conditioning (HVAC) system.
Which gas is used in AC?
FreonFreon is a non-combustible gas that is used as a refrigerant in air conditioning applications. This freon undergoes an evaporation process over and over again to help produce cool air that can be circulated throughout your AC system.
What is AC cycle?
An air conditioner works using a thermodynamic cycle called the refrigeration cycle. It does this by changing the pressure and state of the refrigerant to absorb or release heat. The refrigerant (aka coolant) absorbs heat from inside of your home and then pumps it outside.
Is it good to use AC?
The most important health benefit of air conditioning is reducing your home's humidity. Living in a house that prevents high humidity creates a less damp home, as well as keeping you healthy. High humidity is linked to dust mites, mould, heatstroke and dehydration.
What does AC stand for in history?
BC and AC or CE Explanation: BC (Before Christ). BC (Before Christ). ... AC (After Christ) or CE (Christian Era) and not AD as Muslims often do unthinkingly. ...
What is the full form of AC?
Alternating currentAlternating current / Full name
What do they call AC in UK?
In the UK, the two words have similar levels of usage, and in tropical Singapore (where usage of aircons is close to being a necessity), the term "aircon" is considerably more widely used than the term "AC".
How do air conditioners work?
An air conditioner provides cold air inside your home or enclosed space by actually removing heat and humidity from the indoor air. It returns the...
What is central air?
In its most basic description, the air conditioning process involves two actions that occur simultaneously, one inside the home and one outside the...
How does central air work?
The thermostat, which is typically mounted on a wall in a central location within the home, monitors and controls the temperature of the indoor air...
What is AC in electricity?
e. Alternating current ( AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current (DC) which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form ...
How does alternating current work?
An alternating current of any frequency is forced away from the wire's center, toward its outer surface. This is because the acceleration of an electric charge in an alternating current produces waves of electromagnetic radiation that cancel the propagation of electricity toward the center of materials with high conductivity. This phenomenon is called skin effect. At very high frequencies the current no longer flows in the wire, but effectively flows on the surface of the wire, within a thickness of a few skin depths. The skin depth is the thickness at which the current density is reduced by 63%. Even at relatively low frequencies used for power transmission (50 Hz – 60 Hz), non-uniform distribution of current still occurs in sufficiently thick conductors. For example, the skin depth of a copper conductor is approximately 8.57 mm at 60 Hz, so high current conductors are usually hollow to reduce their mass and cost. Since the current tends to flow in the periphery of conductors, the effective cross-section of the conductor is reduced. This increases the effective AC resistance of the conductor, since resistance is inversely proportional to the cross-sectional area. The AC resistance often is many times higher than the DC resistance, causing a much higher energy loss due to ohmic heating (also called I 2 R loss).
What is a coaxial cable?
Coaxial cables are commonly used at audio frequencies and above for convenience. A coaxial cable has a conductive wire inside a conductive tube, separated by a dielectric layer. The current flowing on the surface of the inner conductor is equal and opposite to the current flowing on the inner surface of the outer tube. The electromagnetic field is thus completely contained within the tube, and (ideally) no energy is lost to radiation or coupling outside the tube. Coaxial cables have acceptably small losses for frequencies up to about 5 GHz. For microwave frequencies greater than 5 GHz, the losses (due mainly to the dielectric separating the inner and outer tubes being a non-ideal insulator) become too large, making waveguides a more efficient medium for transmitting energy. Coaxial cables often use a perforated dielectric layer to separate the inner and outer conductors in order to minimize the power dissipated by the dielectric.
What is the frequency of an alternate current?
Alternating current is used to transmit information, as in the cases of telephone and cable television. Information signals are carried over a wide range of AC frequencies. POTS telephone signals have a frequency of about 3 kHz, close to the baseband audio frequency. Cable television and other cable-transmitted information currents may alternate at frequencies of tens to thousands of megahertz. These frequencies are similar to the electromagnetic wave frequencies often used to transmit the same types of information over the air .
What is the waveform of alternating current?
The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa. In certain applications, like guitar amplifiers, different waveforms are used, such as triangular waves or square waves.
Who invented the alternating current generator?
The earliest recorded practical application of alternating current is by Guillaume Duchenne, inventor and developer of electrotherapy. In 1855, he announced that AC was superior to direct current for electrotherapeutic triggering of muscle contractions. Alternating current technology was developed further by the Hungarian Ganz Works company (1870s), and in the 1880s: Sebastian Ziani de Ferranti, Lucien Gaulard, and Galileo Ferraris .
What is low frequency?
A low frequency eases the design of electric motors, particularly for hoisting, crushing and rolling applications, and commutator-type traction motors for applications such as railways. However, low frequency also causes noticeable flicker in arc lamps and incandescent light bulbs.
What is an indoor air conditioner?
The indoor unit, typically a furnace or a fan coil, includes the evaporator coil and blower fan (air handler) that circulates air throughout the home. The outdoor unit holds the compressor and the condenser coil. Split-system air conditioners provide a variety of options, including basic single-stage systems, quieter and more efficient two-stage ...
What is central air?
Many homes in North America rely on split-system air conditioners, often referred to as “central air.”. Air conditioning systems include a number of components and do more than just cool the air inside. They also can control humidity, air quality and airflow within your home.
How does a compressor work?
The compressor pressurizes the refrigerant gas and sends the refrigerant into the outdoor unit’s condenser coil. A large fan pulls outdoor air through the condenser coil, allowing the air to absorb heating energy from the home and release it outside. During this process, the refrigerant is converted back to a liquid.
How does a fan work in a refrigerant coil?
A fan blows indoor air across the cold evaporator coil where the heat inside the home is absorbed into the refrigerant. The cooled air is then circulated throughout the home while the heated evaporated gas is sent back outside to the compressor.
What is the chemical used in an air conditioner?
A standard air conditioner or cooling system uses a specialized chemical called refrigerant , and has three main mechanical components: a compressor, a condenser coil and an evaporator coil.
What is split system air?
Split-system offer the most common answer to the question, “what is central air ?” These systems include both an indoor unit and an outdoor unit. The indoor unit, typically a furnace or a fan coil, includes the evaporator coil and blower fan (air handler) that circulates air throughout the home. The outdoor unit holds the compressor and the condenser coil.
Why are ductless systems not considered central air systems?
Ductless systems are not considered to be central air systems because they deliver cooling to specific, targeted areas within the home. They require less invasive installation because, as their name suggests, they don't rely on ductwork to distribute chilled air.
Overview
AC power supply frequencies
The frequency of the electrical system varies by country and sometimes within a country; most electric power is generated at either 50 or 60 Hertz. Some countries have a mixture of 50 Hz and 60 Hz supplies, notably electricity power transmission in Japan. A low frequency eases the design of electric motors, particularly for hoisting, crushing and rolling applications, and commutator-type traction motors for applications such as railways. However, low frequency also causes noticeabl…
Transmission, distribution, and domestic power supply
Electrical energy is distributed as alternating current because AC voltage may be increased or decreased with a transformer. This allows the power to be transmitted through power lines efficiently at high voltage, which reduces the energy lost as heat due to resistance of the wire, and transformed to a lower, safer, voltage for use. Use of a higher voltage leads to significantly more effici…
Effects at high frequencies
A direct current flows uniformly throughout the cross-section of a uniform wire. An alternating current of any frequency is forced away from the wire's center, toward its outer surface. This is because the acceleration of an electric charge in an alternating current produces waves of electromagnetic radiation that cancel the propagation of electricity toward the center of materials with high conductivity. This phenomenon is called skin effect. At very high frequencies the curren…
Mathematics of AC voltages
Alternating currents are accompanied (or caused) by alternating voltages. An AC voltage v can be described mathematically as a function of time by the following equation:
,
where
Information transmission
Alternating current is used to transmit information, as in the cases of telephone and cable television. Information signals are carried over a wide range of AC frequencies. POTS telephone signals have a frequency of about 3 kHz, close to the baseband audio frequency. Cable television and other cable-transmitted information currents may alternate at frequencies of tens to thousands of megahertz. These frequencies are similar to the electromagnetic wave frequencies often used t…
History
The first alternator to produce alternating current was a dynamo electric generator based on Michael Faraday's principles constructed by the French instrument maker Hippolyte Pixii in 1832. Pixii later added a commutator to his device to produce the (then) more commonly used direct current. The earliest recorded practical application of alternating current is by Guillaume Duchenne, …
See also
• AC power
• Electrical wiring
• Heavy-duty power plugs
• Hertz
• Mains power systems