Analysis of the payback period of a modernized pump unit with induction electric motors of advanced energy efficiency classes

Aim. The comparative analysis of energy consumption, electricity costs during lifetime cycle and payback period a pump unit with 90 kW 2-pole induction motors, belonging to various efficiency classes, feeding directly from power grid. Methods. examined operating modes aligned typical approximately constant flow rate 75-110 % the rated flow. calculations were based on motors nameplate data, which, in their turn, manufacturers’ experimental data. Results. periods grid have been performed article. application IE2, IE3 IE4 classes has discussed. Practical value. It demonstrated, than case replacement an motor class IE2 due planned retrofit, for is 2.18 years, savings within calculated 20-year are 268MW·h, which makes €41110 money terms. Under same conditions, will allow save 88 MW·h period, expressed monetary terms, €13500 5.11 years. Thus, article proves that despite higher initial price, choice tends be more economically advantageous.