Hvac Basics

Things you need to know about HVACs

The HVAC is one of the most elaborate systems that are found inhomes, offices, and other commercial spaces. These are devices with complicated design given their size, functionality, and level of output. These systems are designed to cool you indoor air in summer as well as heat it in winter. They arecomposed of an air conditioner as well as furnace to serve both the purposes. Some of the systems work on heat pump principle, which can heat and cool the air whenever needed by reversing the cycle.

If you want to trace the history of HVACS, then it goes back to 1851. It was in this year that Dr. John Gorrie was granted a US patent for a refrigerating machine or ice machine as it was then called. Atthat time refrigeration was typically required for refrigeratingmeat for storage and transport. Gradually, the idea of cooling houses for comfortcame up. In 1902, the NYSE was one the first buildings in the world that was air-conditioned.

Besides cooling and heating a HVAC performs the following functions:

• Humidifying: If the indoor air is drained of all moisture it will render adamp feeling. The HVAC adds moisture in the air to make it optimally comfortable.

• Dehumidifying: Too much moisturein the air will lead to sweating and discomfort. So a HVAC also dehumidifies the air as required.

• Cleaning: The filters in the system clean the air of pollens, smoke, and contaminants inside the space. The modern filters can also remove micro bacteria from the air.

• Ventilating: It also adds freshair from outside to freshen up the indoor air and maintain the gas ratio.

• Air movement: It controls the air movement according to needs of thepeople.

How does it work?

The hot air in the rooms is sucked in through the return ducts. The return ducts can be counted as the starting point of a ventilation cycle. These ducts have blower fans to do so. The air then passes through a filtration later. This is done to clean it of dust, debris and even microbial beings. Now it is passed through the main system to cool it. It is passesover cooling coil which has a cool refrigerant passingthrough it. The refrigerantabsorbs the heat of the air and makes it cool. This air is thencirculated to the ductsthroughblowers. It reaches the rooms through the supply ducts. The heat and moisture that is producedduringthe process is vented out through exhaust outlets.

What are psychometric charts?

This chart is made to graphically representthe psychrometric processes of air. This includes various physical and thermodynamic properties of air such as humidity, dry bulb temperature, wet bulb temperature, enthalpy, and air density. The chart tells about the exterior air conditions in a region. It helps an expert to understand the processing that the air must undergoto make it comfortable for people inside a building.These charts are used by HVAC engineers to devise solutionsto many problems.

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