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Keefe’s Air Conditioning, Heating, & Electrical

1919 Enterprise Dr, Harvey, LA 70058, United States

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+1 800-349-3918

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Open 24 hours

Space pressure can be either positive or negative with respect to outside the space. Positive pressure takes place when there is more air being provided than tired, and prevails to decrease the seepage of outside contaminants. Natural ventilation is an essential aspect in minimizing the spread of airborne diseases such as tuberculosis, the common cold, influenza and meningitis.

Natural ventilation requires little maintenance and is economical. An a/c system, or a standalone a/c, supplies cooling and humidity control for all or part of a structure. Air conditioned structures frequently have sealed windows, due to the fact that open windows would work versus the system planned to maintain continuous indoor air conditions.

The percentage of return air comprised of fresh air can usually be controlled by changing the opening of this vent. Normal fresh air intake has to do with 10%. [] Cooling 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 air conditioning horse power is adequate for the area being cooled. Underpowered a/c system will result in power wastage and ineffective use. Adequate horsepower is needed for any air conditioning system set up. The refrigeration cycle utilizes four 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 outside, cools, and condenses into its liquid stage. An (also called metering device) 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, for this reason the heat exchanger is often called an evaporating coil or evaporator.

While doing so, heat is soaked up from indoors and moved outdoors, resulting in cooling of the structure. In variable climates, the system may consist of a reversing valve that switches from heating in winter season to cooling in summer. By reversing the flow of refrigerant, the heatpump refrigeration cycle is changed from cooling to heating or vice versa.

Free cooling systems can have very high effectiveness, and are in some cases integrated with seasonal thermal energy storage so that the cold of winter season can be utilized for summer air conditioning. Common storage mediums are deep aquifers or a natural underground rock mass accessed via a cluster of small-diameter, heat-exchanger-equipped boreholes.

The heat pump is added-in since the storage acts as a heat sink when the system remains in cooling (rather than charging) mode, causing the temperature level to gradually increase during the cooling season. Some systems include an “economizer mode”, which is often called a “free-cooling mode”. When economizing, the control system will open (totally 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 (normally cooled water or a direct expansion “DX” unit), therefore conserving energy. The control system can compare the temperature of the outdoors air vs.

In both cases, the outside air should 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 unit are typically installed in North American residences, workplaces, and public structures, however are difficult to retrofit (install in a building that was not designed to get it) due to the fact that of the large air ducts needed.

An alternative to packaged systems is using separate indoor and outside coils in split systems. Split systems are chosen and commonly utilized around the world except in The United States and Canada. In North America, split systems are usually seen in property applications, however they are getting appeal in little business structures.

The advantages of ductless cooling systems consist of simple installation, no ductwork, higher zonal control, versatility of control and peaceful operation. [] In area conditioning, the duct losses can represent 30% of energy usage. Making use of minisplit can result in energy cost savings in area conditioning as there are no losses associated 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 spaces. Split systems are more effective and the footprint is normally smaller than the plan systems.

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