Program for efficiency analaizing for variable speed drive of pumps

The present paper describe an original program elaborate by authors in order to analyze the economic and energetic efficiency of using variable speed driven for turbo-pumps. The input dates of the program are represented by the parameters circuit hydraulic pump, the pump characteristics, motor drive, static frequency converter circuit and power supply. The program realise a comparative analysis of electricity consumption for flow through valve adjustment and changing speed for a curve given technical task. Starting from energy savings and the equipment cost it can be determined the payback of the investment. The paper presents a case study.