Abstract
Electromagnetic valve for controlling the refrigerant flow is attached to pipe in air conditioning units. Excitation force is generated in the pipe when electromagnetic valve opens and the refrigerant flows. Focusing on this excitation force, we carried out the experiment using refrigerant circulation system. On the other hand, pressure and the flow velocity in the pipe are calculated by fluid analysis. After that, using the pressure and the velocity, we calculated excitation force according to the momentum principle. We found that calculation results both excitation force and displacement of pipe agreed well with experimental results.
