How Hvac Systems Work

How Hvac Systems Work

The following diagram illustrates the basic function of a HVAC system:

•          The building automation device (computer or wall-mounted gadgets usually) can be used to determine whether to heat or cool the space, and to what temperature

•          The system then either heats or cools the coils inside

•          When air brought in from the outside is pushed through these coils, it is either heated or cooled before being pushed into the living space

•          At the same time, air will be displaced from the room back into the system.

Smaller air conditioning systems may operate in the reverse, however, where they collect heat from within a space and push it out in order to cool a room down. We can see these kinds of systems in places like cars. Here’s how these types of HVAC systems work:

This diagram reveals how a system will collect heat from within a space, soak it up like a sponge, and push it back out into the air.

There are five key parts in this system that allow it to operate:

•          Expansion valve: This device creates a restriction in the liquid line of a system, which in turn creates a pressure drop.

•          Evaporator: This device is what removes heat from the space by exchanging it for a boiling refrigerant.

•          Compressor: Think of this component as the system’s heartbeat - it creates the energy and thrust to move refrigerant around the system.

•          Condenser: This is the device that pushes the heat that has built up inside the refrigerant into the outside air.

•          Receiver drier: In order to preserve the air quality, this storage area for excess refrigerant contains a drying agent and a filter that removes contaminants from the system.

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