User:Zaid mazahreh/Heating, Ventilation, and Air Conditioning

HVAC or more pronounced as Heating Ventilation, Air Conditioning is the trade of central air conditioning. It is the process of cleaning, dehumidifies, heats, and cools a sealed controlled room, or building. It is utilized by residential homes, industrial building like offices and warehouse building. As each type of service for has a much different mass, each require an amount of systems that is needed to supply the conditioned air.

History
The earliest uses of HVAC was with the early times of the Greeks, Romans, and Egyptians around the years starting around 1000 AD. They used primal techniques of having people fan important figures with big leaves or The first ever HVAC system was created by a Florida Doctor and inventor by the name of John Gorrie. As the reasonings of creating the system was a way to control temperature to help fight diseases and help keep people comfortable. He created a system of cooling by taking ice blocks from lake water, help fight against the heat to help keep patients in hospitals cooled.

Heating
The heating portion of the system is used through a furnace that generates heat and then transfers the heat to the air. The usual run down of what the system does is pretty simple, you turn your thermostat to heat select a temperature, then the system starts by clearing out anything thing through what's called a flue pipe that get cleared through with what's called is a pressure switch, which tells the system to clear the system. After that the furnace clears up for a few seconds then it the gas flows through the the exhaust of the furnace. The an ignition device starts the flame process increasing the temperature. The system waits for the furnace to heat up then a fan blows the heated air into the vents It will fully operate generating heat for the selected building.

Ventilation
Ventilation is basically air quality control which basically takes out the bad used air and push through fresh cleaned air. As the bad air goes through what is called a return vent and the fresh air goes through a supply vent. To help clean the air, you would use a filter that is placed at the start of the supply vent helping taking away any dust or other containments that would affect the quality of the air. Every system is measured differently, the measurements are never the same as each system can be placed differently and have different branding with different dimensions.

Air Conditioning
The Cooling portion of an HVAC system is the most complicated as the most important part of the system without this part of the system it is impossible for other elements. It is based off of a 4 part system. Which starts with what's normally called the heart of the system the compressor. The compressor is a hermetically sealed system that keeps the flow of a gas/liquid substance that is the blood of the system called refrigerant. It is a manufactured product that is consisted of chemicals, refrigerant is as cooled as liquid nitrogen but very different in its reactions. It cools the pipes that which cools the vents cooling the air making cold air for an air conditioner. After the refrigerant flows through the compressor it changes the form into refrigerant gas increasing the pressure. It will then enter what's called a condenser which condenses the refrigerant into liquid and lowering the pressure making it colder, which pushes the hot air out. Then enters through what's called a metering device or TXV where it increases the pressure increases the temperature and making it more of a gas than a liquid, then it goes through what's called an evaporator where it fully turns into a vapor and have a higher pressure.