Commercial heating and air conditioning system is commonly referred to as HVAC systems, which stands for heating, ventilation and air conditioning systems. These systems are responsible for maintaining the pleasant temperatures and air quality in houses and large buildings. The main purpose is the safe and healthy environment with respect to temperature and humidity. The laws of heat transfer, fluid mechanics and thermodynamics for the design used.
HVAC systems are aimed at improving air quality, ventilation and pressure maintained. Room air distribution methods used for conveying air. The environmental conditions and the fresh air requirements must be specified when designing an HVAC system.
HeatingThe heater used in HVAC systems, each of the different types available. Central heating in cold regions is implemented. The system consists of a furnace, boiler and heat pump. Air control from a central location such as a furnace or mechanical room held.
Water is used as a medium for transferring heat. Pipes and channels serve as passage for the heated liquid is transferred to the rooms through radiators. Radiators can be wall mounted or fixed under the floor.
The pump circulates water and ensures an even heat to all locations. When the weather is warm, the same pipes and cables are used for cooling. The heating can also be achieved by resistance heating. An electric current is used to heat conducting filaments.
There are a few considerations that should be kept in mind. Heat pumps are efficient, but more expensive. They should be used in moderate climates. Heater should be placed near windows or in the colder parts of the building. Harmful gases are formed when the heater is not working properly. This is why proper ventilation is a must for any commercial heating and air conditioning.
VentilationThe ventilation is classified as mechanical or forced and natural. In the former type, an air handler is used to control the indoor air quality by diluting air or replace it with fresh air. Mechanical or forced ventilation is not energy efficient in humid regions.
In these areas, exhaust fans are direct drive for control of air quality and humidity as well as used. In cold areas, ceiling fans can also be reached for ventilation. The warm air in the upper section throughout the room.
Natural ventilation does not use mechanical equipment. It airs a room with open windows, vents or openings in the wall. It works well in small areas, but still widely used due to low prices and without energy consumption.
Air ConditioningAir conditioning heat from a room with radiation, convection and heat pumps. The method is referred to as the cooling circuit. The systems are designed not only to cool the area, but also to ventilate it and to control humidity. Sophisticated designs employ reversing valve that automatically between heating and cooling a room depending on the outside air.
There are central cooling systems, but they can only be installed if a building is to be built. It is difficult to retrofit an already built structure, because the channels are very large. In such cases, separate coils can be used for interior and exterior. The two units are connected by pipelines. Passage for the refrigerant
Dehumidification is important in air conditioning systems. Evaporators or open cooling furniture is used for this purpose. Keller serve as good locations because water density is higher in the air at the lower levels and temperatures. Filtering is also required for the removal of sand particles gases which can be dangerous. The filtering and condenser must be cleaned regularly because of dirt build - up to the compressor are damaged.
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