Selecting the Best Electric Motor for a Centrifugal Pump

Which electric motor should be selected for driving a centrifugal pump?

Considering the data provided, which motor - Motor A or Motor B - is the better option?

Answer:

Based on the data and calculations, Motor A should be selected for driving the centrifugal pump.

When comparing Motor A and Motor B for driving a centrifugal pump, several factors need to be taken into consideration. The decision should be based on the total cost of ownership over the pump's lifespan.

Initial Cost and Efficiency:

Motor A has an initial cost of $1,200, which is higher than Motor B's $1,000. However, Motor A has a higher electrical efficiency of 0.82 compared to Motor B's 0.77. This means that Motor A will consume less electricity to deliver the same amount of power to the pump.

Annual Maintenance and Life Expectancy:

Motor A has an annual maintenance cost of $60, while Motor B's maintenance cost is higher at $100. Additionally, Motor A has a longer life expectancy of 5 years compared to Motor B's 5 years.

Total Cost of Ownership:

Considering the higher efficiency, lower maintenance costs, and longer life expectancy, Motor A proves to be the more cost-effective option in the long run. The combination of these factors results in a lower total cost of ownership over the 5-year period compared to Motor B.

Therefore, based on the calculations and the given data, selecting Motor A over Motor B is the better choice for driving the centrifugal pump.