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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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Space pressure can be either positive or negative with regard to outside the space. Positive pressure occurs when there is more air being supplied than exhausted, and prevails to minimize the seepage of outside pollutants. Natural ventilation is an essential consider lowering the spread of airborne illnesses such as tuberculosis, the cold, influenza and meningitis.

Natural ventilation needs little maintenance and is affordable. An a/c system, or a standalone air conditioning unit, provides cooling and humidity control for all or part of a structure. Air conditioned structures frequently have sealed windows, since open windows would work against the system meant to keep consistent indoor air conditions.

The portion of return air made up of fresh air can typically be controlled by adjusting the opening of this vent. Common fresh air intake is about 10%. [] Air conditioning 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 described as refrigerants.

It is crucial that the air conditioning horsepower suffices for the area being cooled. Underpowered cooling system will result in power waste and inefficient use. Adequate horsepower is needed for any air conditioning system installed. The refrigeration cycle utilizes four important components 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 outside, cools, and condenses into its liquid stage. An (also called metering device) controls the refrigerant liquid to flow at the correct rate. The liquid refrigerant is returned to another heat exchanger where it is allowed to vaporize, thus the heat exchanger is often called an evaporating coil or evaporator.

While doing so, heat is soaked up from inside and transferred outdoors, resulting in cooling of the structure. In variable climates, the system may include a reversing valve that switches from heating in winter to cooling in summertime. By reversing the circulation of refrigerant, the heatpump refrigeration cycle is altered from cooling to heating or vice versa.

Free cooling systems can have very high efficiencies, and are often integrated with seasonal thermal energy storage so that the cold of winter season can be utilized for summertime a/c. Typical storage mediums are deep aquifers or a natural underground rock mass accessed by means of a cluster of small-diameter, heat-exchanger-equipped boreholes.

The heat pump is added-in because the storage functions as a heat sink when the system is in cooling (as opposed to charging) mode, causing the temperature level to slowly increase throughout the cooling season. Some systems consist of an “economizer mode”, which is sometimes called a “free-cooling mode”. When saving money, the control system will open (completely 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 fulfilled without using the mechanical supply of cooling (usually chilled water or a direct growth “DX” system), thus conserving energy. The control system can compare the temperature level of the outside air vs.

In both cases, the outdoors air should be less energetic than the return air for the system to go into the economizer mode. Central, “all-air” air-conditioning systems (or plan systems) with a combined outside condenser/evaporator unit are typically installed in North American homes, workplaces, and public structures, but are hard to retrofit (set up in a structure that was not designed to receive it) since of the bulky duct needed.

An alternative to packaged systems is making use of different indoor and outside coils in split systems. Split systems are preferred and extensively used worldwide other than in The United States and Canada. In North America, split systems are frequently seen in domestic applications, but they are gaining appeal in small industrial structures.

The benefits of ductless a/c systems consist of simple setup, no ductwork, greater zonal control, flexibility of control and quiet operation. [] In space conditioning, the duct losses can account for 30% of energy usage. The usage of minisplit can lead to energy cost savings in area conditioning as there are no losses related to ducting.

Indoor units with directional vents install onto walls, suspended from ceilings, or fit into the ceiling. Other indoor systems install inside the ceiling cavity, so that short lengths of duct handle air from the indoor system 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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