﻿ Calculation of Efficiencies at flows below peak efficiency flow of Francis turbines by RETSCREEN® ENGINEERING & CASES TEXTBOOK

Calculation of Efficiencies at flows below peak efficiency flow of Francis turbines by RETSCREEN® ENGINEERING & CASES TEXTBOOK

 1 Specific speed based on flow：nq - 2 Design flow：Qd m^3/s - 3 Runner throat diameter：d m - 4 Coefficient：Rm (default = 4.5) Turbine manufacture/design coefficient 5 Flow：Q m^3/s Q＜Qp 6 Graph x-axis:nq,y-axis：eq x-axis:Qd,y-axis：eq x-axis:Q,y-axis：eq Plot Input Data： YesNo 7 Number of gridlines of Graph x-axis, y-axis -
:Export Graph Image.

Keyword

Efficiencies at flows below peak efficiency flow,Peak efficiency flow,Turbine peak efficiency,Runner size adjustment to peak efficiency,francis turbines,specific speed based on flow, Runner throat diameter,turbine manufacture/design coefficient

Reference

[1]：RETScreen® International『CLEAN ENERGY PROJECT ANALYSIS：RETSCREEN® ENGINEERING & CASES TEXTBOOK SMALL HYDRO PROJECT ANALYSIS CHAPTER』.pp.37-51.

Remarks

・eq：『Efficiencies at flows below peak efficiency flow』(Reference[1])
・Qp：『Peak efficiency flow』(Reference[1])
・Qd：『design flow(flow at rated head and full gate opening in m^3/s)』(Reference[1])
・ep：『Turbine peak efficiency』(Reference[1])
・Rm：『turbine manufacture/design coeffi cient(2.8 to 6.1; default = 4.5).』(Reference[1])
・^ed：『Runner size adjustment to peak efficiency』(Reference[1])
・^enq：『Specific speed adjustment to peak efficiency』(Reference[1])
・nq：『specific speed based on flow』(Reference[1])
・d：『runner throat diameter』(Reference[1])