What type of heat transfer does the PTAC system utilize?

The PTAC (Packaged Terminal Air Conditioner) system primarily utilizes air-based thermal mass for heat transfer. This system functions by directly heating or cooling the air in the space through a refrigeration cycle that involves evaporators and condensers. As the air passes over the evaporator coil or the condenser coil within the PTAC unit, it absorbs or releases heat, effectively changing the temperature of the air fed into the room.

This method of heat transfer is efficient in both heating and cooling applications as it allows for rapid changes in air temperature, providing immediate comfort to occupants. The reliance on air as the medium makes it suitable for the varied climates and conditions often encountered in different geographical locations. The simplicity and effectiveness of air-based thermal mass in handling thermal comfort in individual rooms make it a popular choice in various residential and commercial settings.