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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

Space pressure can be either positive or negative with respect to outside the space. Favorable pressure occurs when there is more air being provided than exhausted, and is typical to reduce the seepage of outdoors pollutants. Natural ventilation is an essential element in reducing the spread of airborne illnesses such as tuberculosis, the cold, influenza and meningitis.

Natural ventilation requires little upkeep and is low-cost. An air conditioning system, or a standalone air conditioning unit, provides cooling and humidity control for all or part of a structure. Air conditioned buildings typically have sealed windows, since open windows would work versus the system planned to keep consistent indoor air conditions.

The percentage of return air made up of fresh air can normally be controlled by adjusting the opening of this vent. Normal fresh air consumption has to do with 10%. [] Air conditioning and refrigeration are offered through the removal of heat. Heat can be gotten rid of through radiation, convection, or conduction. Refrigeration conduction media such as water, air, ice, and chemicals are referred to as refrigerants.

It is vital that the a/c horsepower is enough for the area being cooled. Underpowered a/c system will cause power wastage and inefficient usage. Appropriate horsepower is required for any a/c unit installed. The refrigeration cycle utilizes 4 important elements to cool. The system refrigerant begins its cycle in a gaseous state.

From there it gets in 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 gadget) regulates the refrigerant liquid to flow at the correct rate. The liquid refrigerant is returned to another heat exchanger where it is permitted to evaporate, hence the heat exchanger is typically called an evaporating coil or evaporator.

In the process, heat is soaked up from inside and moved outdoors, leading to cooling of the structure. In variable climates, the system may include a reversing valve that switches from heating in winter season to cooling in summertime. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa.

Free cooling systems can have really high performances, and are in some cases combined with seasonal thermal energy storage so that the cold of winter can be utilized 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 due to the fact that the storage acts as a heat sink when the system is in cooling (rather than charging) mode, triggering the temperature to gradually 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 (fully or partially) the outside air damper and close (fully or partially) the return air damper.

When the outdoors air is cooler than the required cool air, this will allow the demand to be satisfied without utilizing the mechanical supply of cooling (generally chilled water or a direct expansion “DX” system), hence saving energy. The control system can compare the temperature level 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 bundle systems) with a combined outdoor condenser/evaporator unit are frequently set up in North American houses, offices, and public structures, but are difficult to retrofit (install in a structure that was not created to get it) since 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 chosen and extensively utilized around the world other than in The United States and Canada. In The United States and Canada, split systems are usually seen in domestic applications, but they are gaining popularity in small industrial structures.

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

Indoor systems with directional vents mount onto walls, suspended from ceilings, or fit into the ceiling. Other indoor systems install inside the ceiling cavity, so that brief 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 than the package systems.

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