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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

Space pressure can be either favorable or unfavorable with respect to outside the room. Positive pressure occurs when there is more air being provided than exhausted, and prevails to decrease the infiltration of outside impurities. Natural ventilation is a crucial aspect in minimizing the spread of air-borne diseases such as tuberculosis, the cold, influenza and meningitis. Natural ventilation needs little maintenance and is inexpensive. An air conditioning system, or a standalone air conditioning system, provides cooling and humidity control for all or part of a building. Air conditioned structures often have sealed windows, due to the fact that open windows would work versus the system meant to maintain constant indoor air conditions. The portion of return air made up of fresh air can generally be controlled by changing the opening of this vent. Typical fresh air intake is about 10%. [] Cooling and refrigeration are supplied through the removal 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 horse power suffices for the area being cooled. Underpowered a/c system will result in power wastage and inefficient usage. Sufficient horsepower is required for any air conditioner installed. The refrigeration cycle utilizes 4 important aspects to cool. The system refrigerant begins its cycle in a gaseous state. From there it enters 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 stage. 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 permitted to vaporize, thus the heat exchanger is frequently called an evaporating coil or evaporator. While doing so, heat is soaked up from inside your home and transferred outdoors, leading to cooling of the building. In variable environments, the system might consist of 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 really high performances, and are often combined with seasonal thermal energy storage so that the cold of winter season can be used for summertime a/c. Common 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 remains in cooling (instead of charging) mode, triggering 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 saving money, the control system will open (completely or partially) the outdoors air damper and close (completely or partially) the return air damper. When the outdoors air is cooler than the demanded cool air, this will enable the demand to be met without utilizing the mechanical supply of cooling (typically chilled water or a direct growth “DX” system), thus 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 enter the economizer mode. Central, “all-air” air-conditioning systems (or bundle systems) with a combined outdoor condenser/evaporator unit are typically set up in North American homes, workplaces, and public buildings, however are hard to retrofit (set up in a structure that was not developed to receive it) since of the bulky duct needed. An alternative to packaged systems is using different indoor and outside coils in split systems. Split systems are chosen and commonly used worldwide except in North America. In North America, split systems are frequently seen in residential applications, but they are getting appeal in little business structures. The advantages of ductless a/c systems include easy setup, no ductwork, greater zonal control, flexibility of control and quiet operation. [] In space conditioning, the duct losses can represent 30% of energy usage. The usage of minisplit can result in energy savings in space 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 systems install 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 efficient and the footprint is generally smaller than the plan systems.

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