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98-Mar-B5 May 2015 Page 9 of 19 QUESTION 8 FLOW CONTROL PARTI FANS Describe two of the three methods commonly used for f
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- 98 Mar B5 May 2015 Page 9 Of 19 Question 8 Flow Control Parti Fans Describe Two Of The Three Methods Commonly Used For F 1 (54.14 KiB) Viewed 29 times
98-Mar-B5 May 2015 Page 9 of 19 QUESTION 8 FLOW CONTROL PARTI FANS Describe two of the three methods commonly used for flow control in large centrifugal fans (as for example those installed in large boiler plants). Show in head versus flow diagrams (graphs) for fan and system how the operating point (flow) can be changed in each case and explain why the change has occurred. (5 marks) PART II HYDRO TURBINES Explain how water flow and hence power output is changed in a typical hydro turbine of the Francis type. Show in a sketch the typical arrangement of components to effect this control. Describe any hydraulic concerns in the penstock or draught tube regarding rapid load changes or low load (low flow) operation of a fixed speed (power generating) machine. (5 marks) [ 10 marks)