Evaluation of PAT Performances by Modified Affinity Law.

The use of pumps operating as a turbines (PATs) is an alternative cheap solution for the conversion of dissipations along the distribution networks, but a little information about their performance is available.The turbomachinery affinity law can be applied for the evaluation of the performances curves, but can produce relevant errors that can be reduced with a modification of the affinity law. This research, which is based on experimental collected data, proposes a modification of the turbomachinery affinity law in order to minimize the differences between experimental data and the predicted curves.