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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 negative with respect to outside the room. Favorable pressure takes place when there is more air being provided than exhausted, and prevails to minimize the infiltration of outside pollutants. Natural ventilation is a key consider reducing the spread of airborne diseases such as tuberculosis, the acute rhinitis, influenza and meningitis.

Natural ventilation requires little upkeep and is low-cost. An a/c system, or a standalone air conditioner, provides cooling and humidity control for all or part of a building. Air conditioned buildings frequently have sealed windows, due to the fact that open windows would work versus the system intended to maintain continuous indoor air conditions.

The percentage of return air comprised of fresh air can typically be controlled by adjusting the opening of this vent. Common fresh air consumption is about 10%. [] Air conditioning and refrigeration are provided through the elimination of heat. Heat can be eliminated through radiation, convection, or conduction. Refrigeration conduction media such as water, air, ice, and chemicals are described as refrigerants.

It is imperative that the a/c horse power is adequate for the area being cooled. Underpowered a/c system will result in power wastage and inefficient use. Sufficient horsepower is needed for any a/c unit installed. The refrigeration cycle uses four vital elements to cool. The system refrigerant begins its cycle in a gaseous state.

From there it gets in 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 (also called metering gadget) manages the refrigerant liquid to flow at the proper rate. The liquid refrigerant is returned to another heat exchanger where it is enabled to evaporate, thus the heat exchanger is often called an evaporating coil or evaporator.

While doing so, heat is absorbed from inside and transferred outdoors, resulting in cooling of the building. In variable climates, the system may consist of a reversing valve that changes from heating in winter to cooling in summertime. By reversing the flow of refrigerant, the heatpump refrigeration cycle is altered from cooling to heating or vice versa.

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

The heatpump is added-in because the storage functions as a heat sink when the system remains in cooling (as opposed to charging) mode, triggering the temperature to slowly increase during the cooling season. Some systems consist of an “economizer mode”, which is in some cases called a “free-cooling mode”. When economizing, the control system will open (totally or partly) the outdoors air damper and close (completely or partially) the return air damper.

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

In both cases, the outdoors 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 plan systems) with a combined outdoor condenser/evaporator unit are often installed in North American houses, workplaces, and public buildings, but are difficult to retrofit (set up in a building that was not designed to receive it) because of the bulky air ducts required.

An alternative to packaged systems is the usage of separate indoor and outside coils in split systems. Split systems are preferred and extensively used around the world other than in The United States and Canada. In The United States and Canada, divided systems are usually seen in residential applications, however they are getting appeal in little commercial buildings.

The benefits of ductless cooling systems include easy installation, no ductwork, higher zonal control, versatility of control and quiet operation. [] In area conditioning, the duct losses can account for 30% of energy intake. Using minisplit can result in energy savings in space conditioning as there are no losses related to ducting.

Indoor systems with directional vents install onto walls, suspended from ceilings, or fit into the ceiling. Other indoor units install inside the ceiling cavity, so that short lengths of duct handle air from the indoor unit to vents or diffusers around the rooms. Split systems are more efficient and the footprint is generally smaller than the plan systems.

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