Prices of Air Conditioners

Prices of Air Conditioners:

     The size of a house determines the type of air conditioning system needed. A window air conditioning unit will generally suffice to keep a smaller home cool on warm spring and summer days. The cost to install a window air conditioner averages between $150 and $300, depending on the size you need. Installing a window air conditioning unit can bring added comfort for a reasonable price, but it will be less powerful than a central air conditioning system.
If you have a bigger home with multiple rooms, you will probably need to have a central air conditioning system installed. Homeowners can pay between $500 and $4,000 for central air conditioning. The final cost will depend on the unit, additional installation items such as duct work and the professional's installation rates.

References: Central Air Conditioner Costs | Cost to Install New AC Unit. (n.d.). Retrieved March 22, 2015, from http://www.homeadvisor.com/cost/heating-and-cooling/install-an-ac-unit/

Ductable Split Air Conditioner - Buy Ductable Split Air Conditioner, Price , Photo Ductable Split Air Conditioner, from Blue Star Air Conditioner, Ltd.. Conditioners on All.biz Tiruppur India. (n.d.). Retrieved March 22, 2015, from http://tiruppur.all.biz/ductable-split-air-conditioner-g76701#.VQ8VsI7LdfM

Types of Air Conditioners

Types of Air Conditioners

Window Air Conditioner
Window air conditioner is the most commonly used air conditioner for single rooms. In this air conditioner all the components, namely the compressor, condenser, expansion valve or coil, evaporator and cooling coil are enclosed in a single box. This unit is fitted in a slot made in the wall of the room, or more commonly a window sill.

Split Air Conditioner
The split air conditioner comprises of two parts: the outdoor unit and the indoor unit. The outdoor unit, fitted outside the room, houses components like the compressor, condenser and expansion valve. The indoor unit comprises the evaporator or cooling coil and the cooling fan. For this unit you don’t have to make any slot in the wall of the room. Further, present day split units have aesthetic appeal and do not take up as much space as a window unit. A split air conditioner can be used to cool one or two rooms.

Packaged Air Conditioner

An HV/AC designer will suggest this type of air conditioner if you want to cool more than two rooms or a larger space at your home or office. There are two possible arrangements with the package unit. In the first one, all the components, namely the compressor, condenser (which can be air cooled or water cooled), expansion valve and evaporator are housed in a single box. The cooled air is thrown by the high capacity blower, and it flows through the ducts laid through various rooms. In the second arrangement, the compressor and condenser are housed in one casing. The compressed gas passes through individual units, comprised of the expansion valve and cooling coil, located in various rooms.

Reference: How to Choose the Right Type of Air Conditioner For Your Home. (n.d.). Retrieved March 22, 2015, from http://thehightechsociety.com/how-to-choose-the-right-type-of-air-conditioner-for-your-home/

Types of Air Conditioning Systems: Window, Split, Packaged and Central. (n.d.). Retrieved March 22, 2015, from http://www.brighthubengineering.com/hvac/897-types-of-air-conditioning-systems/

History of Air Conditioning

History of Air Conditioners/Conditioning:

• 1820 Ice was first artificially made as an experiment.
• 1824 Michael Faraday discovered the principles for the absorption type of refrigeration.
• 1834 Jacob Perkins invented the first artificial ice manufacturing machine which led to our modern compression systems.
• 1902 Willis Haviland Carrier invented the first air conditioner to control the temperature and humidity of a printing company, marking the first time effort taken to control the temperature of the surroundings. This starts the history of air conditioning.
• 1906 Stuart W. Cramer come out with the term "Air Conditioning." which was later adopted by Carrier.
• 1913 The first international refrigeration expo is held in Chicago.
• 1928 The discovery of Freon refrigerant by Thomas Midgley, Jr.
• 1930 The White House is air-conditioned.
• 1946 The demand for room air conditioners began to increase with more than 30,000 units produced on this year.
• 1953 Room air conditioners sale exceed 1 million units. This is another key milestone in the history of air conditioner.
• 1953 The Refrigeration Equipment Manufacturers Association and The Air-Conditioning and Refrigerating Machinery Association are formed.
• 1957 The first rotary compressor was developed hence making air conditioning units smaller and more efficient compared to the reciprocating type.
• 1977 Heat Pumps equipment developed that allows cooling and heating cycle using the same machine that can be used to provide cooling during summer and heating during winter.
• 1987 Montreal Protocol signed to protect the earth's ozone layer is signed in Montreal, Canada. The Protocol establishes international cooperation on the phase out of ozone depleting substances, including the chlorofluorocarbon(CFC) refrigerants used in HVAC equipment.
• 1990 Microprocessor control systems are used in all areas of refrigeration and air conditioning due to the readily available semiconductor technology.
• 1992 The R-22 Alternative Refrigeration Evaluation Program (AREP) starts to find alternative refrigerants to R-502 and R-22.
• 1995 Chloroflourocarbon (CFC) manufacturing in the USA ends on December 31.
• 1997 Kyoto Protocol signed to protect the earth's climate by reducing greenhouse gases that cause climate change.
• 1998 Unitary air conditioners and heat pumps set a sale record of more than 6 million units.
• 2007 A State Council issued a circular to restrict the temperature of air conditioning in public buildings to 26°C (78°F) or higher during summer and 20°C (68&decF) and lower during winter. Sale of low efficiency air conditioning units are also outlawed.

Reference:Gree Air Conditioners – Ductless Mini Splits. (n.d.). Retrieved March 22, 2015, from http://www.greeairconditioner.com/gree-air-conditioners/

  

History Of Air Conditioner. (n.d.). Retrieved March 22, 2015, from http://www.airconditioning-systems.com/history-of-air-conditioner.html

Advantages of Air Conditioning

List of Advantages of using air conditioners:

-Maintain suitable humidity in all parts of a building
-Free the air from excessive humidity during certain seasons
-Supply a constant and adequate supply of ventilation
-Efficiently remove from the air micro-organisms, dust, soot, and other foreign bodies
-Efficiently cool room air during certain seasons
-Heat or help heat the rooms in winter
-An apparatus that is not cost-prohibitive in purchase or maintenance


Reference:(n.d.). Retrieved March 22, 2015, from https://www.ashrae.org/resources--publications/free-resources/top-ten-things-about-air-conditioning

What are Air Conditioners? How do they Work?

What are Air Conditioners and How do they Work?

  

Air conditioners and refrigerators work

the same way. Instead of cooling just the small, insulated space inside of a refrigerator, an air conditioner cools a room, a whole house, or an entire business.

Air conditioners use chemicals that easily convert from a gas to a liquid and back again. This chemical is used to transfer heat from the air inside of a home to the outside air.

The machine has three main parts. They are a compressor, a condenser and an evaporator. The compressor and condenser are usually located on the outside air portion of the air conditioner. The evaporator is located on the inside the house, sometimes as part of a furnace. That's the part that heats your house.

The working fluid arrives at the compressor as a cool, low-pressure gas. The compressor squeezes the fluid. This packs the molecule of the fluid closer together. The closer the molecules are together, the higher its energy and its temperature.

The working fluid leaves the compressor as a hot, high pressure gas and flows into the condenser. If you looked at the air conditioner part outside a house, look for the part that has metal fins all around. The fins act just like a radiator in a car and helps the heat go away, or dissipate, more quickly.

When the working fluid leaves the condenser, its temperature is much cooler and it has changed from a gas to a liquid under high pressure. The liquid goes into the evaporator through a very tiny, narrow hole. On the other side, the liquid's pressure drops. When it does it begins to evaporate into a gas.

As the liquid changes to gas and evaporates, it extracts heat from the air around it. The heat in the air is needed to separate the molecules of the fluid from a liquid to a gas.

The evaporator also has metal fins to help in exchange the thermal energy with the surrounding air.

By the time the working fluid leaves the evaporator, it is a cool, low pressure gas. It then returns to the compressor to begin its trip all over again.

Connected to the evaporator is a fan that circulates the air inside the house to blow across the evaporator fins. Hot air is lighter than cold air, so the hot air in the room rises to the top of a room.

There is a vent there where air is sucked into the air conditioner and goes down ducts. The hot air is used to cool the gas in the evaporator. As the heat is removed from the air, the air is cooled. It is then blown into the house through other ducts usually at the floor level.

This continues over and over and over until the room reaches the temperature you want the room cooled to. The thermostat senses that the temperature has reached the right setting and turns off the air conditioner. As the room warms up, the thermostat turns the air conditioner back on until the room reaches the temperature.

Reference: How Does An Air Conditioner Work? (n.d.). Retrieved March 22, 2015, from http://www.energyquest.ca.gov/how_it_works/air_conditioner.html

Air Conditioners: How Bad Are They for Your Health? (n.d.). Retrieved March 22, 2015, from http://www.healthguidance.org/entry/16845/1/Air-Conditioners-How-Bad-Are-They-for-Your-Health.html