Air Flow Moves From High Pressure To Low Pressure An Introduction to HVAC Systems and How They Work

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An Introduction to HVAC Systems and How They Work

Understanding HVAC systems

A heating, ventilation and air conditioning (HVAC) system is the breathing system of any building. Its main purpose is to provide conditioned air i.e. clean and odorless air to breathe in a safe and comfortable environment. The HVAC system controls air quality, movement and temperature to ensure it is within a comfortable range.

According to their usage, HVAC can be classified into three types such as commercial HVACs, residential HVACs and industrial HVACs. A better understanding of the HVAC system helps you understand the importance of regular maintenance to ensure its long-lasting performance and full benefits.

How does your HVAC system work?

An HVAC system operates in a repetitive cycle to fulfill its responsibility of providing hot or cold air as needed. How does it do that? Consider the function of its components below.

ventilation system

Ventilation systems are of three types – supply, exhaust and balanced. An exhaust ventilation system uses exhaust fans to remove air from the home. This reduces the internal air pressure and allows the natural flow of outside air. A supply ventilation system does it the other way around – it pumps air into the building to expel the old, stale air. A balanced ventilation system uses both supply and exhaust fans to push stale air out and fresh air in.

in air conditioning

An air conditioning system usually consists of two units, the inner unit is known as the evaporator and the outer unit is known as the condenser. The condenser is on the high pressure side of the system. The compressor turns the refrigerant into a high pressure gas and sends it to the compressor. It loses its heat and becomes a liquid. This liquid goes to the evaporator which is the low pressure side of the unit. Because of the sudden drop in pressure here, the refrigerant vaporizes and turns into a low-temperature, low-pressure gas. As air circulates through the many ducts in the system, heat is absorbed and cool air is circulated through the ventilation system. The repeating cycle provides continuous cooling air.

heating up

Your HVAC system consists of a furnace and ductwork that are connected together to provide heat exchange. A fan is usually attached to the system to draw heat from the ventilation system and circulate it into the building. A heat pump can also be used to supplement the furnace but for a central heating system, it is essential. The pump moves heat from the outside air into the evaporator and then, it is pumped into the ventilation system.

An HVAC system consists of exhaust ducts, supply ducts, and return ducts. Each must be installed correctly for the system to function efficiently. Regular maintenance of your HVAC system can prevent poor ventilation and save you money in the long run.

Contact your local expert contractor to get quality maintenance service or to inquire more about your HVAC system.

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