A centrifugal pump is being designed to pump liquid refrigerant R-134a at room temperature and atmospheric pressure. The impeller inlet and outlet radii are r1 = 100 and r2 = 180 mm, respectively (Fig. 1). The impeller inlet and outlet widths are b1 = 50 and b2 = 30 mm. The pump is to deliver 0.25 m3/s of the liquid at a net head of 14.5 m when the impeller rotates at 1720 rpm. Design the blade shape for the case in which these operating conditions are the design conditions of the pump (V1,t = 0, as sketched in the figure); specifically, calculate angles B1 and B2, and discuss the shape of the blade. Also predict the horsepower required by the pump.
A centrifugal pump is being designed to pump liquid refrigerant R-134a at room temperature and atmospheric pressure. The impeller inlet and outlet radii are r1 = 100 and r2 = 180 mm, respectively (Fig. 1). The impeller inlet and outlet widths are b1 = 50 and b2 = 30 mm. The pump is to deliver 0.25 m3/s of the liquid at a net head of 14.5 m when the impeller rotates at 1720 rpm. Design the blade shape for the case in which these operating conditions are the design conditions of the pump (V1,t = 0, as sketched in the figure); specifically, calculate angles B1 and B2, and discuss the shape of the blade. Also predict the horsepower required by the pump.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A centrifugal pump is being designed to pump liquid refrigerant R-134a at room temperature and atmospheric pressure. The impeller inlet and outlet radii are r1 = 100 and r2 = 180 mm, respectively (Fig. 1). The impeller inlet and outlet widths are b1 = 50 and b2 = 30 mm. The pump is to deliver 0.25 m3/s of the liquid at a net head of 14.5 m when the impeller rotates at 1720 rpm. Design the blade shape for the case in which these operating conditions are the design conditions of the pump (V1,t = 0, as sketched in the figure); specifically, calculate angles B1 and B2, and discuss the shape of the blade. Also predict the horsepower required by the pump.
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