The Basics of HVAC – HVAC for Beginners

Basic need of HVAC

The Objective of HVAC are to regulate the temperature of air inside the designated “Air Conditioned" space along side control of moisture, filtration of air and containment of air borne particles, supply of outside fresh air for control of oxygen and carbon dioxide levels in the air conditioned space, and finally control of the movement of air or drought. All these factors comprise of a successful HVAC system. Air conditioning has changed over the years from just cooling of an area to the effective control of all the above parameters.

HVAC has its history in 1851 when Dr. John Gorrie was granted a US patent for a refrigerating machine. Though refrigeration therein period was concerned with the preservation of frozen meat for transport and making of ice, gradually the concept of cooling for comfort arose. In 1902, the ny stock market was one among the primary air-conditioned buildings.

Processes of HVAC

The goal of the heating, ventilating and air con (HVAC)system is to make and maintain a cushty environment within a building.

A comfortable environment, However, is broader than simply temperature and humidity. Comfort requirement that are typically impacted by the HVAC system include:

1)Heating: To increase the temperature by adding thermal energy to a space.

2)Cooling: To decrease the temperature by removing thermal energy from a space.

3) Humidity: The process of increasing or decreasing the relative humidity of a space by addition of water vapor or steam or removing the water vapor or humidity of a space.

4) Air movement: To control the movement of the supplied air so that the inhabitants of the space do not feel discomfort.

5) Fresh air : The process of adding external air to freshen up the air and maintaining gas ratio.

6) Cleanliness of the air : The process of removing dust, pollen, smoke and contaminants from air inside the space.

Some HVAC systems address these comfort requirements better than others.

In addition, there are other factors that affect comfort but aren't directly associated with the HVAC system. Examples include adequate lighting, and proper furniture and work surfaces.

The purpose of this era is to supply a way for understanding the components of various sorts of HVAC systems. The premise of this method is that any HVAC system can be dissected into basic subsystem. These subsystems will be referred to as "loops". There are five primary loops which will describe virtually any sort of HVAC system.

1) Air side loop

2) Chilled waterloop

3) Refrigerationloop

4) Heat rejectionloop

5) Controls loop

Before we continue, confine mind these three observations. First, while these five loops are often wont to describe virtually any HVAC system, not every system uses all five loops.

Second, the temperatures utilized in this era are representative of conditions found during a typical HVAC system, but are going to be differ from application to application.

And third, while another loop might be added for heating and humidifying the space in some systems, this clinic focuses totally on comfort cooling, not heating.

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