Choosing your Air Conditioner
To choose your Air Condition few thing you need to know. How an AC works and what is important to choose for your air conditioning.
An Air Conditioner (AC) is a device to cool down your area of living, either a residential house or an office or a commercial area.
Two refrigerants commonly used in residential air conditioners are R-22 and the newer R-410A, both of which are chemically known as hydro chlorofluorocarbons, or HCFCs.
These chemicals go back and forth from a liquid to a gaseous state very easily, and it is these so-called phase transitions that make HCFCs so useful as refrigerants.
A common phase transition we’ve all seen is when liquid water is heated and evaporates into a gas, or water vapor. The same goes for the refrigerant: it absorbs heat in its liquid state, transforming into a gas. The refrigerant is then forced to return to being a liquid, expelling the heat it absorbed and thus made ready to soak up heat once again.
Important part in an air conditioner are an evaporator, a compressor, a condenser and an expansion device.
The part inside the home where the refrigerant evaporates is the evaporator, naturally. Fans in the home blow air across the evaporator’s coils.
As air from the house moves across the evaporator, refrigerant within the coil picks up the temperature of the air, “The refrigerant is absorbing heat from the air and turns from a liquid to a vapor. It went from being a cold liquid to a hotter vapor, and at the same time, the air had heat removed from it, so the air went from being warmer to colder.
The vaporized refrigerant then passes into the compressor, which is located outside in the air conditioning unit adjacent to a home (or often on the roof of a business), along with the condenser. As the name implies, the compressor compresses the gas to a state of higher pressure and higher temperature.
From there, the hot, pressurized gas flows over the third component, the condenser. Here, the gas is condensed back into its liquid state as heat is radiated away. Outdoor units often have metal fins on them to help dissipate the heat more quickly.
The cooled-off liquid is now returned into the home. The expansion device regulates the flow of liquid refrigerant into the evaporator, where just as before it will absorb heat and change phase from a liquid into a low-pressure gas.
Removing heat is not all that an air conditioner does as it, ahem, conditions the air. Humidity, the amount of water vapor in the air — is a major factor in how our bodies feel the heat; a more humid environment prevents sweat from evaporating off the skin, which helps to whisk away unwanted bodily warmth.
So, in order to render the environment inside a home or business more comfortable, air conditioners also dehumidify.
The Noise Level
The noise is another factor we should know about it. When we see a unit has certain decibels, we know what does mean. A good air condition that does not bother our ear has a dB not more than 78. Lower the dB is better.
- Near total silence – 0 dB
- A whisper – 15 dB
- A lawnmower – 90 dB
- A car horn – 110 dB
- A rock concert or a jet engine – 120 dB
- A gunshot or firecracker – 140 dB
Any sound above 85 dB for a longer time can cause hearing loss, and the loss is related both to the power of the sound as well as the length of exposure. You know that you are listening to an 85-dB sound if you have to raise your voice to be heard by somebody else. Eight hours of 90-dB sound can cause damage to your ears; any exposure to 140-dB sound causes immediate damage.
Residential types of AC
Two most popular AC are the normal AC unit with a coil attached to above a furnace duct, or Air Handler and another type of AC called ductless AC or split system.
The split system is ideal for an apartment unit or the houses does not have any duct like the houses has radiant floor heat system.
Unit of an air conditioner
To see how big an AC is or how efficient is different from a unit for a furnace or a boiler which is BTU or % of efficient.
The unit for an AC in the houses is Ton and the efficiency unit is a SEER (Seasonal Energy Efficiency Rating) for cooling lost calculate in Alberta normally is 700-800 sqf per ton. For example, for a house with 1500 sqf need 2 ton AC or 2500 sqf house needs 3.5 ton AC.
The unit for split system is still BTU. However, this measure meant still convertible to a Ton. Every Ton is equal to 12000 BTU. Most of the split system are Heat Pump, which is good for heat and cool, as matter of fact the evaporator works two ways. That is why we measure them with BTU.
The efficiency for an AC starts 10 Seer to 20 Seer. 13 Seer is the starting of Seasonal Energy Efficiency Rating, not less than that is except it anymore. Today’s day most of the houses install 14 Seer and 16 Seer. A higher SEER has more electrical efficiency and lower dB level. For example a Trane AC unit with 57 dB. 50–60 decibels = the sound of an electric toothbrush or low normal conversation.
Choosing your AC
First to see if you need AC unit or split system. Second, sqft of your coverage area. Third, the SEER factor in your mind. Fourth, the deal based on the brand, warranty and cost.
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