What does pump efficiency measure?

What does pump efficiency measure?

• A. The percent of electrical power converted to heat inside the pump
• B. The percent of power used by the pump to move the water
• C. The percent of input power lost to internal friction
• D. The percent of energy delivered to the electrical grid

Answer: (B)

Pump efficiency measures how effectively electrical power is turned into useful hydraulic energy to move water. It is the percent of input electrical power that is actually used to move the water (hydraulic work), compared to the total power supplied to the pump. In other words, efficiency = hydraulic power (flow times head) divided by input electrical power. The other statements describe heat losses, internal friction losses, or energy sent elsewhere, which are not the measure of efficiency itself.

Pump efficiency measures how effectively electrical power is turned into useful hydraulic energy to move water. It is the percent of input electrical power that is actually used to move the water (hydraulic work), compared to the total power supplied to the pump. In other words, efficiency = hydraulic power (flow times head) divided by input electrical power. The other statements describe heat losses, internal friction losses, or energy sent elsewhere, which are not the measure of efficiency itself.