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Washington Energy Services

3909 196th St SW, Lynnwood, WA 98036, United States

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1 800-398-4663

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Room pressure can be either positive or negative with regard to outside the room. Positive pressure occurs when there is more air being supplied than exhausted, and prevails to decrease the infiltration of outside impurities. Natural ventilation is an essential consider reducing the spread of airborne illnesses such as tuberculosis, the acute rhinitis, influenza and meningitis.

Natural ventilation requires little maintenance and is low-cost. A cooling system, or a standalone ac system, offers cooling and humidity control for all or part of a building. Air conditioned structures frequently have sealed windows, because open windows would work against the system meant to preserve constant indoor air conditions.

The percentage of return air made up of fresh air can normally be controlled by adjusting the opening of this vent. Typical fresh air consumption has to do with 10%. [] Air conditioning and refrigeration are provided 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 referred to as refrigerants.

It is imperative that the cooling horsepower suffices for the location being cooled. Underpowered a/c system will cause power waste and ineffective usage. Adequate horse power is needed for any a/c unit set up. The refrigeration cycle utilizes four necessary elements to cool. The system refrigerant starts its cycle in a gaseous state.

From there it goes into 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 device) controls the refrigerant liquid to stream at the correct rate. The liquid refrigerant is returned to another heat exchanger where it is enabled to evaporate, hence the heat exchanger is frequently called an evaporating coil or evaporator.

In the process, heat is taken in from indoors and transferred outdoors, resulting in cooling of the structure. In variable climates, the system might include a reversing valve that switches from heating in winter to cooling in summer. 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 efficiencies, and are sometimes combined with seasonal thermal energy storage so that the cold of winter season 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 because the storage functions as a heat sink when the system remains in cooling (as opposed to charging) mode, causing the temperature level to gradually increase throughout the cooling season. Some systems consist of an “economizer mode”, which is often called a “free-cooling mode”. When saving money, the control system will open (completely or partly) the outdoors air damper and close (fully or partly) the return air damper.

When the outside air is cooler than the demanded cool air, this will enable the need to be met without using the mechanical supply of cooling (normally 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 outdoors air should be less energetic than the return air for the system to get in the economizer mode. Central, “all-air” air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are frequently set up in North American homes, workplaces, and public buildings, however are difficult to retrofit (install in a structure that was not designed to receive it) because of the bulky air ducts required.

An alternative to packaged systems is the usage of different indoor and outdoor coils in split systems. Split systems are preferred and extensively utilized around the world except in North America. In North America, divided systems are most often seen in residential applications, but they are gaining appeal in little commercial buildings.

The benefits of ductless air conditioning systems include simple setup, no ductwork, higher zonal control, versatility of control and peaceful operation. [] In space conditioning, the duct losses can represent 30% of energy usage. Using minisplit can result in energy savings in area conditioning as there are no losses connected with ducting.

Indoor units with directional vents install onto walls, suspended from ceilings, or fit into the ceiling. Other indoor systems mount inside the ceiling cavity, so that short lengths of duct manage air from the indoor system to vents or diffusers around the rooms. Split systems are more effective and the footprint is typically smaller sized than the plan systems.

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