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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 space. Positive pressure occurs when there is more air being supplied than tired, and is typical to minimize the infiltration of outside impurities. Natural ventilation is an essential consider lowering the spread of air-borne diseases such as tuberculosis, the cold, influenza and meningitis.

Natural ventilation requires little maintenance and is economical. An air conditioning system, or a standalone a/c unit, offers cooling and humidity control for all or part of a structure. Air conditioned structures often have actually sealed windows, due to the fact that open windows would work versus the system meant to maintain continuous indoor air conditions.

The percentage of return air comprised of fresh air can normally be controlled by changing the opening of this vent. Common fresh air consumption is about 10%. [] A/c and refrigeration are offered 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 horsepower is sufficient for the location being cooled. Underpowered a/c system will cause power wastage and inefficient use. Sufficient horse power is needed for any a/c unit set up. The refrigeration cycle uses four essential elements to cool. The system refrigerant starts its cycle in a gaseous state.

From there it gets in a heat exchanger (in some cases 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) controls the refrigerant liquid to flow at the appropriate rate. The liquid refrigerant is gone back to another heat exchanger where it is allowed to evaporate, thus the heat exchanger is typically called an evaporating coil or evaporator.

At the same time, heat is taken in from indoors and transferred outdoors, resulting in cooling of the structure. In variable environments, the system may consist of a reversing valve that changes from heating in winter season to cooling in summer. 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 often combined with seasonal thermal energy storage so that the cold of winter season can be utilized for summertime cooling. 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 acts as a heat sink when the system is in cooling (rather than charging) mode, causing the temperature to slowly increase throughout the cooling season. Some systems consist of an “economizer mode”, which is sometimes called a “free-cooling mode”. When economizing, the control system will open (fully or partially) the outside air damper and close (totally or partly) the return air damper.

When the outside air is cooler than the demanded cool air, this will allow the need to be satisfied without utilizing the mechanical supply of cooling (typically cooled water or a direct expansion “DX” system), thus saving energy. The control system can compare the temperature of the outdoors 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 plan systems) with a combined outdoor condenser/evaporator system are frequently set up in North American homes, offices, and public structures, but are hard to retrofit (install in a structure that was not created to get it) because of the large air ducts needed.

An alternative to packaged systems is using different indoor and outside coils in split systems. Split systems are chosen and extensively utilized worldwide except in North America. In The United States and Canada, split systems are frequently seen in property applications, however they are acquiring appeal in little commercial buildings.

The benefits of ductless air conditioning systems include easy installation, no ductwork, higher zonal control, versatility of control and peaceful operation. [] In space conditioning, the duct losses can account for 30% of energy usage. Using minisplit can lead to energy cost savings in area conditioning as there are no losses connected with ducting.

Indoor systems with directional vents install onto walls, suspended from ceilings, or suit the ceiling. Other indoor systems 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 effective and the footprint is typically smaller than the package systems.

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