Discussion on selection of variable frequency technology in chilled water system of central air conditioning

Discusses the variable frequency technology to be applied in three kinds of chilled water systems which are not clearly defined by relevant codes and standards. Proposes that the variable frequency technology can be reasonably applied to the primary pump of primary-secondary pumping system. Analyses the rationality of variable frequency technology to be applied to reconstruction projects and proposes some issues which should be paid attention to. Puts forward two new concepts, including static variable frequency and dynamic variable frequency. Analyses the specific application of these two kinds of variable frequency technologies in rectified reconstruction and variable volume reconstruction projects. Performs technical and economic comparison between the variable frequency rectified reconstruction method and other rectified reconstruction methods. Considers that the static variable frequency is not always the most reasonable rectification method. Suggests that the dynamic variable frequency should be used as far as possible to achieve better energy saving effect.