Thermodynamics: This was what I tried origionally, but the answer is incorrect.

Question

Thermodynamics:

This was what I tried origionally, but the answer is incorrect.

1 out of 3 attempts Round your final answers to two decimal places A pump increases the water pressure from 70 kPa at the inlet to 700 kPa at the outlet. Water enters this pump at 15°C through a 0.8-cm-diameter opening and exits through a 3.0-cm-diameter opening. Determine the velocity of the water at the inlet and outlet when the mass flow rate through the pump is0.84 kg/s m/s inlet m/s exit What is the velocity at the inlet if the inlet temperature is raised to 40°C? m/s inlet,40°C 700 kPa Water AS

Explanation / Answer

In the above solution,
1. you must change the D1 as 0.08m instead of 0.01m for the determination of velocity if water at the inlet.
2. similarlly you have to chane the outlet diameter D2 as 0.3m instead of 0.015 m.
3. the specific volume for each are same and no need to change.
4. finally consider the mass flow rate and specific not to be constant, then find for velocity of pump at exit.
5. Remaining all are exact and plug all the equations.

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