Heating Ventilation & Air Conditioning (HVAC): Breathing Easy - By: Alice Shown

Among the world's worst pollution problems are indoor air pollution and urban air quality, according to a 2008 report by Blacksmith Institute. Here's where a heating ventilation and air- conditioning (HVAC) system helps, as it regulates and maintains good quality of air indoors and provides thermal comfort.

Heating Ventilation & Air Conditioning (HVAC): Heating System

The heating system in heating ventilation & air conditioning (HVAC) units can be of different types:

* Central Heating System: Many buildings place a boiler or furnace in a centralized location to heat the water or steam. The heated water or steam acts as the medium to distribute heat throughout the building.

* Forced Air System: Heated air is sent through the ductwork. In summer, the same ductwork used for heating can be used for cooling.

* Electrical Heating System: Here, the filament coil heats up when electricity is passed through it.

Care should also be taken to provide insulation from outside weather to prevent heat losses from the systems.

Heating Ventilation & Air Conditioning (HVAC): Ventilation System

Ventilation in heating ventilation & air conditioning (HVAC) units is the process of replacing air indoors to control the quality of air and the temperature. It also includes the controlling and removal of moisture, bacteria and carbon dioxide and replenishing the area with oxygen. Ventilation involves not only the exchange of air from the outdoors, but also the circulation of air indoors. Ventilation systems are of two types:

* Mechanical Ventilation: Common examples of mechanical ventilation are fans and exhausts, which are used to get rid of excess humidity, unpleasant smell, etc. in kitchens and bathrooms. Ceiling and tabletop fans are used for air circulation in rooms, where, due to the movement of air, there is a sensation of reduced temperature.

* Natural Ventilation: Windows and vents that can be opened are used for natural ventilation. Though natural ventilation uses less energy, total dependency on natural ventilation is not feasible.

Heating Ventilation & Air Conditioning (HVAC): Air Conditioning

In Heating Ventilation & Air Conditioning (HVAC) units, heat is removed through the processes of radiation and convection. The cooling medium or refrigerants take the heat away from the surroundings by evaporation. Since they work at low temperatures, moisture in the air condenses onto the coils, which is collected and piped out to a drain, thereby controlling humidity. These systems have filters that need to be kept clean or replaced, to prevent power losses and improve efficiency of the machine.

About the Author

The Heating Ventilation & Air Conditioning (HVAC) system provides a healthy and comfortable living environment by maintaining near constant indoor air conditions.

Article Directory Source: http://www.articlerich.com/profile/Alice-Shown/77736

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