ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2020 Question 71

Question 71

A two stage centrifugal compressor operating at 3000 rpm is to compress refrigerant R134a from an evaporator temperature of $$O^\circ C (h_i = 398.6 kJ/kg)$$ to a condensing temperature of $$32^\circ C (h_e = 419.8 kJ/kg)$$. If the impeller diameter of both the stages have to be same, what is the diameter of the impeller?
Assume suction condition to be dry saturated, compression process isentropic, impeller blades radial and refrigerant enters impeller radially

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1 year, 4 months ago

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