A flow rate of 3 m'ls of water is available at a height of I 10 m at a project site. Due to losses in the sup- |ply line, the head available at the inlet to powerhouse is estimated to be only 101 m of water. The leakage losses in the powerhouse are negligible. Mechanical losses account for 150 kW. Frictional losses in the rotor blades may be taken as 250 kW. The exit velocity of water from the turbines is 4.5 m/s. Calculate the hydraulic, mechanical, and overall efficiencies of the plant. The specific weight of water may be taken as 9810 N/m'.

A flow rate of 3 m'ls of water is available at a height of I 10 m at a project site. Due to losses in the sup- |ply line, the head available at the inlet to powerhouse is estimated to be only 101 m of water. The leakage losses in the powerhouse are negligible. Mechanical losses account for 150 kW. Frictional losses in the rotor blades may be taken as 250 kW. The exit velocity of water from the turbines is 4.5 m/s. Calculate the hydraulic, mechanical, and overall efficiencies of the plant. The specific weight of water may be taken as 9810 N/m'.

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter34: Emission Control Diagnosis And Service

Section: Chapter Questions

Problem 2RQ: What will result from too little EGR flow? And what can cause a reduction in the flow?

See similar textbooks

Similar questions

At a hydroelectric plant the difference in elevation between the surfaace of the water at the intake and at the tailrace is 183m (600ft). When the flow is 80 cfs, the friction loss in the penstock is 60 ft and the head utilized by the turbine is 460 ft. The mechanical friction in the turbine is 100hp, and the leakage loss is 3 cfs. Find (a) hydraulic efficiency; (b) volumetric efficiency; (c) power delivered to shaft; (d) brake horse power, (e) mechanical efficiency; (f) over-all efficiency.
In a 3.5 MW hydroelectric power plant, the elevation of the headwater is 2100 m and that of a tailwater is 180 m. Penstock diameter is 750 mm. The water is flowing at a velocity of 5 m/s, and the total head loss is 15% of the gross head. The impulse turbine nozzle is 3.0 m above tailwater level. Penstock length is 1220 m, electrical efficiency is 95%. Calculate mechanical efficiency (%).
An axial flow turbine is operated at a pressure head of 24m and develops 24.2MW when rotating at 146 r/min. The tips of the blades are on a diameter of 4,72m and the hub diameter is 2,1m. If the hydraulic efficiency is 94% and the overall efficiency 88%, determine the inlet and exit angles of the blades at the mean radius. Assume free vortex flow towards the rotor and conditions for maximum power
An existing impulse turbine-generator installation operates at 450 rpm under a net Head of 520 m. The output current is 60 cycles per second. If a single 18-cm diameter waterjet is used, Cv = 0.98, Øe = 0.45 and ηT = 0.85. Find the flow through turbine in m3/sec.
A Francis turbine is to be designed to produce 27 MW at a shaft speed of 90rev/minunder an effective head of 27.8 m. Assuming that the optimum hydraulic efficiency is 90percent and the runner tip speed to jet speed ratio is 0.75, determine:(1) the power specific speed;(2) the volume flow rate;(3) the impeller diameter and blade tip speed.
A centrifugal pump pumps water at a flow rate of 7 m³/s to a height of 10 m. If the pump works at the best efficiency point, find the pump impeller diameter, pump speed, the best efficiency value of the pump, the head at the best efficiency value, and the specific speed of the pump, given that CQ=0.15 CH=6 CP=0.75.
A centrifugal pump(efficiency 86%) lifts water through a total height of 42m from reservoir to discharge. Pumping is through 300m of 75mm diameter pipe at the rate of 20li/s. If pipe friction factor, f = 0.025, what KW is required? Answer: 9
A Kaplan turbine working under a head of 43 m deve-lops 15,400 B.H.P. The dia of theboss is 0"3 times the dia ofrunner. Determine the speed and dia of runner, if speed ratio is2, flow ratio as 0-65 and overall efficiency as 91%.
A centrifugal pump operating under steady flow conditions delivers (2000 + K) kg/min of water from an initial pressure of [100 + (K/2)] kPa to a final pressure of [1000 + 2K] Pa. The diameter of the inlet pipe to the pump is 20 cm and the diameter of the discharge pipe is 8 cm. What is the work done?
A Pelton wheel is to be designed for a head of 400 m when running at 500 rpm. The Pelton wheel develops 10000kW shaft power. The blade angle at outlet is 15º. The relative velocity of water is reduced by 5% by moving over the buckets. Velocity of the buckets = 0.45 times the velocity of the jet, overall efficiency = 0.8 and coefficient of the velocity = 0.98. If the Pelton wheel is provided with three nozzle, find (i) The diameter of jet (ii) Total flow rate and the force exerted by a jet on the buckets
A centrifugal pump is pumping water at the design conditions with a flowrate of 2300 gpm and a tangential velocity of U2=65ft/s. The flow passage area at the outlet is A2=1ft2. About 5% of the flow is recirculated internally and pumped again. The actual head rise of the pump is 94ft and the blade angle at outlet is 28º. Knowing that the total number of blades is Zb=24, the power needed to operate the pump is Ps=65hp. Take g = 9.81 m/s2 = 32.2 ft/s2 & ρw = 998 kg/m3 =1.94 Slug/ft3. Estimate the theoretical head of the pump in ft using Stodola’s formula (Hi). Determine the mechanical efficiency of the pump (ηm).
single row impulse turbine receive 3 kg/s of steam with velocity 425 m/s . The blade speed ratio is 0.4 and the output power is 171.58 kW. If the frictional losses in the moving blade amount to 14.92 kW, determine the diagram efficiency and the blade velocity coefficient. The nozzles angle is 16o