Question

The Assignment: Water at a pressure of 15 bar at a temperature of 30°C enters a...

The Assignment:

Water at a pressure of 15 bar at a temperature of 30°C enters a boiler, where it is heated to 250°C at constant pressure. Steam leaving the boiler passes into a throttle which reduces the pressure to 10 bar. The steam is then passed through a small turbine, exiting at atmospheric pressure at 110°C. Please draw a schematic diagram. 1. How much heat is added per kg to the water by the boiler? 2. Find the temperature of the steam leaving the throttle. 3. If the turbine produces 15kW of work, find the mass flowrate of steam through the system.

Notes:

 Remember to state any assumptions that you make.

 All pressures are absolute.

 Show all your working clearly and give your answers to a suitable degree of accuracy.

 Make sure your submission is legible if you’re handwriting it!

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