CVM Failure Case Studies

By Z.A. Hartono & I. Robiah

According to the collection volume method (CVM), the protection zone of the CVM is shaped like an inverted parabola with the apex at the point of high field intensification e.g. The Dynasphere air terminal or the corners of a structure. The proponents of the CVM always claimed that the “attractive radius” of the Dynasphere collection volume, when viewed from plan, is the largest due to the high field intensification at the terminal.
Studies of several low and high structures installed with the Dynasphere air terminal show that bypasses had occurred within the “attractive radius”. Some of these bypasses occurred as close as 10 metres away from the terminal while others occurred on the curved edges of the buildings where little or no field intensification was expected. This demonstrates that the CVM is a defunct air terminal placement method.

Click here to read or download the complete report (885KB, 15 pages)