What are the key components of a typical centralized all-air HVAC sys.pdf

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What are the key components of a typical centralized all-air HVAC system? Write the component name and their corresponding function/role. Based on the heat transfer media, HVAC systems can be classified into how many systems? Which system is the most popular system and why? Solution HVAC stands for Heating, Ventilating and Air Conditioning. The key components and their functions are as follows: 1. Thermostat. - to keep the home at a desired temperature. When the ambient temperature becomes too cold or too hot, the thermostat will trigger the heat exchanger or the evaporator coil- condensing unit combo to begin circulating warmed or cooled air as needed. 2. Furnace. - to heat a supply of air which is to be distributed to various rooms of the building via the HVAC. This heating process is accomplished using one of four possible heat sources -- combustion (burning natural gas, oil, coal, or propane), electric resistance, heat pump, or solar energy collected on site. 3. Heat exchanger. - switches on when the furnace is activated by thermostat to produce warmer temperatures in winter. The heat exchanger pulls in cool air, heats it, and circulates the resulting heated air via your ducts and out through the vents. 4. Evaporator coil. - it acts to cool the air when the thermostat is set to lower temperatures in summer. which is then circulated through the ductwork. 5. Condensing unit. - When the refrigerant has been cooled to a liquid by heat exchange with the exterior air, the condensing unit pumps the liquid to the evaporator coil to be evaporated into a gas once more. 6. Refrigerant lines. The refrigerant lines carry a refrigerant substance to the condensing unit vaporized in the form of a gas, and return it to the evaporator coil in liquid form. 7. Ductwork. - system of ducts that transports air warmed or cooled by the system to the various areas of the building. 8. Vents. - transfer the heated or cooled air from the duct system into the individual rooms of the building..

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