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Question: a centrifugal pump is being designed to pump liquid refrigerant...

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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 r 100 and r2 180 mm, respectively (Figure 3a). The impeller inlet and outlet widths are b 50 and b2 30 mm (Figure 3a). The pump is to deliver 0.25 m/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 condtions are the design conditions of the pump (V0, Figure 3a), specifically calculate angles p, and β2 and calculate the horsepower requirement of the pump. For R-134a, at T-20 oC, specific volume v.-0.0008 157 m1kg (7 markah/marks) 418

h pomuput(M) and required net (8 markah/marks For water at 20°C, ρ 998.0 kg/m3. ative 1 ,1 2,relative βι KIG200 Rajah 3alFigure 3a

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