Hvac Heating and Cooling

Home Heating and Cooling Solutions

Air Conditioning Units

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Air Conditioning

Installing a good air conditioning system in your home is very important regardless of where you live as you are likely to experience the discomfort of high temperatures and high humidity.

There are a number of reasons why air conditioning units are the best solution in these circumstances.

First, having air conditioning in your home means being able to regulate your indoor temperature. You can set your system to the coolness you prefer, and you will always be comfortable.

Second, air conditioners provide a benefit you cannot have from simply opening your windows. They keep the quality of the air in your house fresh and clean. Outdoor aromas, air pollution, and other unpleasant scents will not fill the house when you use an air conditioning system.

A third benefit is good health. Whether the area where you live is humid or simply very hot, it can undermine a person’s health. It can be especially dangerous for infants, elderly persons, and people who have various medical conditions. Even when temperatures soar to their highest degrees, the coolness from your air system will keep everyone in your family healthy.

While many people enjoy the hot summer months, almost no one wants the heat to extend inside their homes. All you need to do is choose a good system and your apartment or house will be the perfect place to retreat. The systems are easy to install, and simple to use. Anyone in the family can set it to their own personal preference, and appreciate its benefits. There are numerous air conditioning systems to choose from, which include ductless air conditioning units to a handy portable air conditioner. There are also a slew of manufacturers that make these systems which include Mitsubishi, Trane, Daikin and Samsung, so you can be sure you will be able to find the one that is right for you.

How do air conditioning units work?

The theory behind how air conditioners work is quite simple, they collect heat energy, via absorption from one area, which is then moved and discarded to an alternate place. To achieve this effectively, the system will usually consist of two units, one outside the building and the other one located conveniently indoors; they are both connected together by piping and ductwork.

The piping is usually made from copper and is used to transfer the refrigerant coolant around the system and it is this coolant that is used to absorb and transfer the heat energy as required by the system. In doing this the air con unit effectively cools a warm room, or area, by shifting the heat within it to the outside via the outdoor unit.

The following diagram shows how this process works:-

air conditioning units

1. The unit located indoors has a fan in it. This fan sucks in warm air from the room it is located in and channels this air through and over a coiled heat exchanger which contains the refrigerant coolant. This then absorbs the heat in the warm air cooling it down, and is blown back out into the room.

2. The copper piping that contains the coolant transfers the heat that was absorbed from the warm air in the room, by passing it through to the outside unit.

3. Once the coolant reaches the outdoor unit it is compressed, a process that releases the warm air previously absorbed from the warm room inside the home, and passed through some more coils, know as condenser coils. The final step is to disperse of this warm air, which is done by using another fan located in the outside unit, which blows it out of its air ducts.

4. The refrigerant is now ready to be used in the cooling process again so is sent back round the system to the indoor unit.

5. Within the indoor unit, the refrigerant absorbs the heat in the warm room as it is decompressed and the process starts all over again.

Here is a video that shows this process further:-

Air Conditioners – a more in depth look

In order to talk about how an air conditioning system functions, it is necessary to define a few special terms. For one thing, air conditioning does not refer only to lowering temperature. In its broadest sense it means controlling temperature, humidity, purity and movement of air. The term encompasses both cooling and heating as well as humidity control and many other important qualities of the air in a given space. It would be fair to ask why service providers speak of air conditioning and heating since the phrase is redundant.

The truth is that the proper definition of air conditioning does not have any great currency among the general public, and so the longer phrase makes for more effective advertising. For purposes of this discussion, though, the term cooling will be used to refer to lowering the air temperature, even though it may be even more misleading than air conditioning.

Houses are not actually cooled during the hottest part of summers; they are simply made less hot and humid, which brings it to a point that the occupants perceive as comfortable. Basic thermodynamics means that some quantity of heat exists in all air at any level of temperature. Short of absolute zero, cool air does not exist. There is only air that is more or less hot. Room temperature, the level of heat most comfortable to the average human, is around 70 degrees Fahrenheit. This means that a home air conditioner window unit only needs to remove enough heat from any particular room to get it to that temperature.

When an air conditioning unit begins to function, it initiates a series of heat transfers. The heat from hot air inside the structure is transferred to the cool surface of the evaporator coil inside the air handler in your air conditioning unit. It then passes to a condenser outside the building structure and from there to the outside air. In some units the heat is routed to water instead of to outside air, integrating the heating of water for domestic use with the cooling of the interior air.

The efficient transfer of heat requires a certain amount of movement of the air involved inside the house. This is usually accomplished by the use of a large blower fan inside the air handler. It sucks in air from the return side of the air handler and blows it out the supply side. There is an art to planning the placement of an air conditioning vent in a structure to achieve proper air flow, which must take into account the fact that hot air goes up and cold air goes down. Without proper air flow there can be no proper air conditioning, and the increased load may even damage the equipment. In extreme cases an overloaded system may present a fire hazard.

An air conditioning system is designed to deal with a specific amount of air flow and a specific quantity of heat energy transfer. If the conditions vary from these design constraints the air conditioning unit will cease to function properly and may not work at all. This means regular maintenance is imperative. Dirty filters, for instance, can reduce air flow over the evaporator to the point where a frozen coil can occur.

Some systems, referred to as heat pumps, combine the functions of heating and air conditioning. Heat transfer works according to exactly the same principles in winter as in summer. Only the direction of the transfer is reversed, except of course for the direction of movement of air which does not change. In a home that uses a heat pump the outside unit is the evaporator in winter and the condenser is inside in the air handler. Heat from the outside is transferred inside, even though the outside temperature may be very low. Heat exists in all air no matter what its temperature, and although it may feel cold to a human, there is still enough heat in the air outside for the heat pump to keep a home toasty warm.

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