Air conditioning and Ventilation

Air conditioning

Air conditioning is treatment to make temperature, humidity, cleanliness of air meet the requirements of conditioned space. It also includes the distribution of air. Air conditioner can be divided in to several types, those are direct expansion coolers, chilled water system, and evaporative coolers.

 Direct expansion cooler is the kind of usual air conditioner that found in residential house. This air conditioner uses refrigeration cycle as its principle. Air is blown through the cold part (evaporator) and distribute to the room.

Chilled water system doesn’t  cool the air directly. This air conditioner cool water and then water will be flown to the Air Handling Unit (AHU) to cool the air.

Evaporative cooler is usually used in hot and dry climate region. This air conditioner evaporates the water sprayed and resulting lower temperature of air.

Ventilation

Ventilation is the process that removes or supplies air at the room. Every room has function, such as class room, laboratory, etc. Those rooms have different requirements of ventilation. Designing HVAC system consider many aspects of parameter, one of them is how much air must be supplied.  This parameter can be achieved by designing ventilation system.

All parameter HVAC design requirement are treated to make thermal comfort for the occupancy. ASHRAE made a standard about human comfort. (ASHARE STANDARD 55)