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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 regard to outside the room. Favorable pressure occurs when there is more air being supplied than tired, and is typical to decrease the infiltration of outside contaminants. Natural ventilation is an essential consider decreasing the spread of air-borne diseases such as tuberculosis, the acute rhinitis, influenza and meningitis.

Natural ventilation needs little upkeep and is low-cost. An a/c system, or a standalone a/c unit, supplies cooling and humidity control for all or part of a building. Air conditioned structures frequently have sealed windows, since open windows would work versus the system planned to preserve consistent indoor air conditions.

The percentage of return air made up of fresh air can generally be controlled by adjusting the opening of this vent. Normal fresh air consumption has to do with 10%. [] Cooling and refrigeration are supplied 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 referred to as refrigerants.

It is imperative that the air conditioning horsepower is adequate for the area being cooled. Underpowered a/c system will cause power waste and ineffective usage. Adequate horse power is required for any air conditioner set up. The refrigeration cycle uses four essential elements to cool. The system refrigerant begins its cycle in a gaseous state.

From there it goes into a heat exchanger (sometimes called a condensing coil or condenser) where it loses energy (heat) to the outdoors, cools, and condenses into its liquid phase. An (also called metering device) manages the refrigerant liquid to flow at the appropriate rate. The liquid refrigerant is gone back to another heat exchanger where it is enabled to evaporate, for this reason the heat exchanger is frequently called an evaporating coil or evaporator.

At the same time, heat is absorbed from inside and transferred outdoors, leading to cooling of the structure. 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 changed from cooling to heating or vice versa.

Free cooling systems can have very high efficiencies, and are sometimes combined with seasonal thermal energy storage so that the cold of winter can be used for summer season air conditioning. Typical 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 since the storage functions as a heat sink when the system is in cooling (rather than charging) mode, triggering the temperature to slowly increase throughout the cooling season. Some systems include an “economizer mode”, which is often called a “free-cooling mode”. When saving money, the control system will open (completely or partially) the outside air damper and close (totally or partly) the return air damper.

When the outdoors air is cooler than the required cool air, this will enable the demand to be met without utilizing the mechanical supply of cooling (normally chilled water or a direct growth “DX” unit), thus 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 go into the economizer mode. Central, “all-air” air-conditioning systems (or bundle systems) with a combined outdoor condenser/evaporator system are typically set up in North American houses, offices, and public buildings, but are tough to retrofit (install in a structure that was not designed to get it) since of the bulky air ducts required.

An alternative to packaged systems is using separate indoor and outside coils in split systems. Split systems are preferred and widely utilized around the world except in North America. In North America, divided systems are frequently seen in residential applications, but they are gaining appeal in little industrial buildings.

The advantages of ductless a/c systems include simple installation, no ductwork, greater zonal control, versatility of control and quiet operation. [] In area conditioning, the duct losses can represent 30% of energy usage. The use of minisplit can lead to energy savings in area conditioning as there are no losses connected 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 short lengths of duct deal with air from the indoor unit to vents or diffusers around the spaces. Split systems are more effective and the footprint is usually smaller sized than the plan systems.

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