ABSTRACT
Air conditioning is achieved by developing the principles of moving air in ducted ventilation systems to include a number of physical and scientific processes which enhance the air quality. The VAV system has a central air-processing unit to produce air at a specified temperature and relative humidity. Perimeter induction units usually located under windows blend primary air from the air-processing unit with secondary air from within the room. The high-velocity primary air mixes with low-velocity secondary air drawn into a plenum ceiling from the room below. Refrigeration systems are used to: The system most suited to air conditioning is the vapour compression cycle. A heat pump is in principle a refrigeration cycle operating in reverse by extracting heat from a low temperature source and upgrading it to a higher temperature for heat emission or water heating. The heat energy in air alone is insufficient, but it can be upgraded by applying the principle of a heat pump refrigeration cycle.
