Abstract
Trends of control technologies about air-conditioning machineries, especially room or packaged air conditioners, are presented in this paper.
Multiple air conditioning systems for office buildings are mainly described as one application of the refrigeration cycle control technologies including sensors for thermal comfort and heating/ cooling loads are also described as one of the system control technologies.
Inverter systems and related technologies for driving variable speed compressors are described in both case of including induction motors and brushless DC motors.
Technologies for more accurate control to meet various kind of regulations such as ozone layer destruction, energy saving and global warming, and for eliminating harmonic distortion of power source current, as a typical EMC problem, will be urgently desired.
