What Is The HVAC System?
What Is The HVAC System? – The initials HVAC stand for Heating, Ventilation and Air Conditioning. They describe the functions of the HVAC system. This mechanical system’s design is primarily an attempt to take control of the environmental conditions inside the space you work.
The main functions of the HVAC system
The HVAC system is designed to control the environment in which it works.
It achieves this by controlling the temperature of a room through heating and cooling. It also controls the humidity level in that environment by controlling the movement and distribution of air inside the room. The system also ensures cleanliness of air inside the said environment.
Types of HVAC Systems Available
The three main types of HVAC systems available today are
- Split and Window AC
- Packaged Heating & Air Conditioning System
- Central AC System
How Does the System Work?
Not all types of HVAC systems work the same way. Some are faster than others while others serve larger environments. In short, some HVAC systems are more effective than others in certain situations.
Here’s how the different systems work
Split and Window AC Systems
In a window AC, fans blow air through the coils. This improves how they separate the heat and cold. Heat gets lost to the outside air while introducing cold is into the room.
The split AC focuses on splitting the cold from the hot side of the system. The cold side has the cold coil and the expansion valve. This is usually placed inside a furnace or any other form of air handler. The handler blows air over the coil and the cooled air is distributed to various rooms in the building through the air ducts.
Packaged Heating & Air Conditioning System
These units provide an all-in-one benefit in that they have both heating and cooling equipment in a single “package”. Users can place them in mechanical rooms, on the rooftop or at a grade close to the conditioning space.
Unlike in split systems where the cold and hot units are separate, the package AC has all the components in one unit. These elements have a centrifugal fan or blower that helps distribute the air throughout the elements of the structure.
Most of the air conditioners in residential buildings are in the form of split systems – only bigger. They have a cooling fan, a condenser coil and a compressor housed in a separate condensing unit. The evaporator coil is usually inside an air handler (indoor) unit normally installed on the furnace. When the furnace is electric, a blower is included in the system.
The compressor uses electricity as its source of power to pump the refrigerant across the system collecting indoor heat and removing it from the home. The heat dissipates outdoors by the coil in the condensing unit. The heat in the air transfers to the coil and thus the air cools. The water vapor condenses on the coil (since it is cold) and collects inside a drain pan. It goes outside through the condensate drain.
The heat, after flowing to the evaporator coil, pumps outdoors while the now cooled air inside the room circulates through the fan on the air handler.