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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 positive or negative with regard to outside the space. Positive pressure happens when there is more air being supplied than exhausted, and prevails to lower the seepage of outside impurities. Natural ventilation is a crucial element in decreasing the spread of airborne diseases such as tuberculosis, the cold, influenza and meningitis. Natural ventilation needs little maintenance and is economical. An a/c system, or a standalone air conditioner, supplies cooling and humidity control for all or part of a structure. Air conditioned buildings frequently have sealed windows, since open windows would work against the system meant to maintain continuous indoor air conditions. The portion of return air comprised of fresh air can usually be controlled by adjusting the opening of this vent. Common fresh air consumption is about 10%. [] Air conditioning and refrigeration are provided 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 described as refrigerants. It is necessary that the cooling horsepower is adequate for the area being cooled. Underpowered cooling system will result in power waste and inefficient use. Adequate horsepower is needed for any a/c set up. The refrigeration cycle utilizes four vital elements 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 phase. An (also called metering gadget) manages the refrigerant liquid to stream at the proper rate. The liquid refrigerant is gone back to another heat exchanger where it is enabled to vaporize, hence the heat exchanger is often called an evaporating coil or evaporator. While doing so, heat is absorbed from inside your home and transferred outdoors, leading to cooling of the structure. In variable climates, the system might 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 changed 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 can be utilized for summertime 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 heat pump is added-in due to the fact that the storage serves as a heat sink when the system remains in cooling (instead of charging) mode, triggering the temperature level to gradually increase throughout the cooling season. Some systems include an “economizer mode”, which is in some cases called a “free-cooling mode”. When economizing, the control system will open (totally or partially) the outside air damper and close (completely or partly) the return air damper. When the outside air is cooler than the demanded cool air, this will permit the need to be fulfilled without using the mechanical supply of cooling (typically cooled water or a direct growth “DX” system), hence conserving energy. The control system can compare the temperature level of the outdoors air vs. In both cases, the outdoors air needs to be less energetic than the return air for the system to enter 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 residences, offices, and public structures, however are hard to retrofit (set up in a building that was not developed to receive it) because of the bulky duct needed. An alternative to packaged systems is making use of different indoor and outdoor coils in split systems. Split systems are preferred and extensively used around the world except in North America. In North America, split systems are usually seen in residential applications, but they are gaining popularity in small industrial structures. The benefits of ductless a/c systems include easy setup, no ductwork, greater zonal control, versatility of control and quiet operation. [] In space conditioning, the duct losses can represent 30% of energy usage. Using minisplit can result in energy cost savings in area conditioning as there are no losses associated with ducting. Indoor units with directional vents mount onto walls, suspended from ceilings, or suit the ceiling. Other indoor systems mount 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 generally smaller sized than the plan systems.

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