Answer Happy

Question 4. [20 marks) (a) Describe, with the aid of a diagram, what is meant by a water tube steam boiler. Why are water tube boilers used instead of fire tube boilers? [4 marks) (b) A Steam power plant is shown in Figure Q4. Steam is raised in the boiler at a rate of 86.4 tonnes per hour. Using the charts and or table provided answer the following. (1) Sketch the approximate T-s diagram of the process [2 marks] (ii) Allowing for pump work calculate the enthalpy of points 1-4. [4 marks) (iii) Calculate the cycle efficiency [2 marks] (iv) Calculate the power developed in the turbine [2 marks] (v) Calculate the isentropic efficiency of the turbine [4 marks) (vi) Calculate the specific steam consumption [2 marks) Ti = 570.0°C Pa = 100.00 bar = turbine P2 = 5.0 kPa x2 = 0 0.84 Boiler 2 Condenser T3 = 30.0°C Figure Q4