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Riley Heating & Air Conditioning

1019 Knowles Rd, Phenix City, AL 36869, United States

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+1 334-298-1278

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Mon-Sun, 8am – 9pm

Room pressure can be either positive or unfavorable with regard to outside the room. Positive pressure takes place when there is more air being provided than exhausted, and is typical to minimize the seepage of outdoors contaminants. Natural ventilation is an essential element in reducing the spread of air-borne diseases such as tuberculosis, the cold, influenza and meningitis.

Natural ventilation needs little upkeep and is economical. An air conditioning system, or a standalone air conditioning unit, offers cooling and humidity control for all or part of a building. Air conditioned buildings typically have sealed windows, since open windows would work versus the system intended to keep consistent indoor air conditions.

The percentage of return air comprised of fresh air can usually be manipulated by changing the opening of this vent. Typical fresh air intake is about 10%. [] A/c and refrigeration are offered through the removal of heat. Heat can be removed through radiation, convection, or conduction. Refrigeration conduction media such as water, air, ice, and chemicals are referred to as refrigerants.

It is essential that the cooling horsepower suffices for the area being cooled. Underpowered cooling system will result in power wastage and ineffective use. Sufficient horse power is needed for any a/c unit set up. The refrigeration cycle utilizes 4 necessary aspects to cool. The system refrigerant begins its cycle in a gaseous state.

From there it goes into a heat exchanger (often called a condensing coil or condenser) where it loses energy (heat) to the outside, cools, and condenses into its liquid phase. An (likewise called metering device) regulates the refrigerant liquid to flow at the proper rate. The liquid refrigerant is gone back to another heat exchanger where it is allowed to evaporate, for this reason the heat exchanger is typically called an evaporating coil or evaporator.

At the same time, heat is taken in from inside and transferred outdoors, resulting in cooling of the building. In variable climates, the system may include a reversing valve that switches from heating in winter to cooling in summertime. By reversing the flow of refrigerant, the heat pump refrigeration cycle is altered from cooling to heating or vice versa.

Free cooling systems can have really high performances, and are often integrated with seasonal thermal energy storage so that the cold of winter can be utilized for summer a/c. Common storage mediums are deep aquifers or a natural underground rock mass accessed via a cluster of small-diameter, heat-exchanger-equipped boreholes.

The heat pump is added-in since the storage serves as a heat sink when the system remains in cooling (rather than charging) mode, causing the temperature to slowly increase throughout the cooling season. Some systems include an “economizer mode”, which is sometimes called a “free-cooling mode”. When saving money, the control system will open (totally or partially) the outdoors air damper and close (completely or partly) the return air damper.

When the outdoors air is cooler than the required cool air, this will permit the need to be fulfilled without using the mechanical supply of cooling (usually chilled water or a direct expansion “DX” system), therefore saving energy. The control system can compare the temperature of the outside air vs.

In both cases, the outside air must be less energetic than the return air for the system to get in the economizer mode. Central, “all-air” air-conditioning systems (or bundle systems) with a combined outside condenser/evaporator system are often set up in North American homes, workplaces, and public buildings, however are hard to retrofit (install in a building that was not designed to get it) due to the fact that of the large air ducts required.

An alternative to packaged systems is using different indoor and outdoor coils in split systems. Split systems are preferred and widely used around the world except in The United States and Canada. In The United States and Canada, split systems are usually seen in residential applications, but they are acquiring appeal in small commercial buildings.

The advantages of ductless cooling systems include easy installation, no ductwork, greater zonal control, flexibility of control and peaceful operation. [] In area conditioning, the duct losses can account for 30% of energy intake. Making use of minisplit can lead to energy cost savings in space conditioning as there are no losses associated with ducting.

Indoor systems with directional vents mount onto walls, suspended from ceilings, or suit the ceiling. Other indoor units mount inside the ceiling cavity, so that brief lengths of duct manage air from the indoor system to vents or diffusers around the rooms. Split systems are more effective and the footprint is generally smaller than the bundle systems.

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