The flow rate of water is to be measured continuously through a flow meter in a system that operates 24/7. The pipe where the flowmeter is to be located has an internal diameter of 5 cm, and the typical flow velocity at that point is 0.5 m/s. Your boss wants you to compare the operating costs of a Venturi flow meter and an orifice flow meter, both with the same contraction ratio of β= 0.5. The discharge coefficient for the Venturi is 0.98 and for the orifice is 0.62. Electricity costs $0.10/kW-hr, and the pump is 70% efficient. How much will it cost to operate each flow meter over the projected 20-year life of the facility?
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