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Boer Brothers Heating & Cooling

104 R NC Hwy 54 West #333 Carrboro, NC 27510

Telephone

1 919-929-9886

Hours

Mon-Fri : 8am-7pm

Sat-Sun : 9am-5pm

Room pressure can be either positive or negative with respect to outside the room. Positive pressure happens when there is more air being supplied than tired, and is typical to reduce the seepage of outside contaminants. Natural ventilation is a key factor in minimizing the spread of airborne illnesses such as tuberculosis, the common cold, influenza and meningitis. Natural ventilation needs little upkeep and is low-cost. A cooling system, or a standalone air conditioning unit, supplies cooling and humidity control for all or part of a building. Air conditioned buildings often have sealed windows, since open windows would work against the system planned to keep continuous indoor air conditions. The percentage of return air made up of fresh air can typically be manipulated by adjusting the opening of this vent. Common fresh air intake has to do with 10%. [] Cooling and refrigeration are offered through the removal of heat. Heat can be removed through radiation, convection, or conduction. Refrigeration conduction media such as water, air, ice, and chemicals are referred to as refrigerants. It is crucial that the a/c horse power suffices for the area being cooled. Underpowered cooling system will lead to power wastage and inefficient use. Sufficient horsepower is needed for any air conditioning system set up. The refrigeration cycle utilizes four necessary aspects 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 outdoors, cools, and condenses into its liquid stage. An (also called metering device) regulates the refrigerant liquid to stream at the proper rate. The liquid refrigerant is gone back to another heat exchanger where it is permitted to evaporate, hence the heat exchanger is frequently called an evaporating coil or evaporator. In the process, heat is taken in from inside your home and moved outdoors, resulting in cooling of the structure. In variable environments, the system may consist of a reversing valve that switches from heating in winter season to cooling in summer season. By reversing the circulation of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa. Free cooling systems can have extremely high performances, and are sometimes combined with seasonal thermal energy storage so that the cold of winter season can be used for summer air conditioning. 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 due to the fact that the storage serves as a heat sink when the system is in cooling (as opposed to charging) mode, causing 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 outdoors air damper and close (completely or partially) the return air damper. When the outside air is cooler than the demanded cool air, this will allow the demand to be fulfilled without utilizing the mechanical supply of cooling (usually cooled water or a direct growth “DX” system), hence saving energy. The control system can compare the temperature 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 bundle systems) with a combined outside condenser/evaporator unit are often set up in North American homes, offices, and public buildings, however are tough to retrofit (install in a structure that was not designed to get it) since of the large duct needed. An alternative to packaged systems is the use of separate indoor and outside coils in split systems. Split systems are chosen and widely utilized around the world other than in The United States and Canada. In North America, split systems are most typically seen in property applications, however they are acquiring popularity in little business structures. The benefits of ductless cooling systems consist of simple installation, no ductwork, higher zonal control, flexibility of control and peaceful operation. [] In area conditioning, the duct losses can account for 30% of energy consumption. The use of minisplit can result in 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 units install inside the ceiling cavity, so that brief lengths of duct handle air from the indoor unit to vents or diffusers around the spaces. Split systems are more effective and the footprint is generally smaller than the package systems.

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