Understanding The Functioning Of Air Conditioning and HVAC Systems

  • Added:
    Aug 09, 2013
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Understanding The Functioning Of Air Conditioning and HVAC Systems Photo by Aabher Ray

HVAC systems have been considered one of the best innovations of mankind. Offering an ambient environment by eliminating excessive humidity, these systems have made our lives more comfortable. Irrespective of the weather conditions outside, air conditioning systems continue to transfer purified air in our homes and offices. The term HVAC stands for heating, ventilation and air conditioning. The equipment is primarily used to create a favourable environment, by either increasing or decreasing the temperature, while maintaining the level of humidity. Removing odour and airborne contaminants, the air conditioning systems aid in improving the interior air by providing access to outdoor fresh air.

Air conditioning hvac system designs are based on the laws of heat transfer, thermodynamics and fluid mechanics. Although the functioning of this system may seem complicated from the inside, its functioning is quite simple. Three vital components form the basic elements of all weather control systems and HVAC air conditioners function using the same methodology. They have a warm or cool air source, a control unit which regulates the system, and a channel which distributes the warm or cold processed air to different rooms. The system unit comprises of an indoor coil with several tubes which increases the temperature of the refrigerant used. The liquid used as a heat transferring agent depends on the system. While the wide surface attached to the tubes in the indoor coils increase the cold surface area, the temperature between the liquid passed through the coil and the air passed over the coil increases.

As the refrigerant passes through the outside coil, it condenses and loses its heat while maintaining a higher pressure and temperature. This refrigerant is then transferred to the evaporator coil through a copper tube, which is located in the fan unit. The transmission converts the liquid refrigerant into a low pressurized gas, which then expands and absorbs the heat from the air inside your home through the duct system, leaving behind cool air for distribution. The same cycle continues every time you switch on your HVAC systems for air conditioning.

However, when you use it as a heating system, the process gets reversed. The unit absorbs the heat from the external air and pumps it to the evaporator coil for distributing it inside your homes. While these systems pump cool or warm air, they also remove excess humidity when they are passed through the evaporator coil. The additional moisture in the air is transferred to the outside coil in the unit, from where it gets transferred to a drain. Excessively used in large and mid-sized industrial units and corporate environments, air conditioning hvac systems aid in regulating temperature while fostering a healthy environment.

Aabher Ray has extensive knowledge in the field of air conditioning and HVAC systems. Using his expertise, he writes articles and shares his experience.

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