3.) The steam rate to a turbine for variable output is controlled by a throttle valve in the inlet line. Steam is supplied to the throttle valve at 1,700 kPa and 225°C. During a test run, the pressure at the turbine inlet is 1000 kPa, the exhaust steam at 10 kPa has a quality of 0.95, the steam flow rate is 0.5 kg/s, and the power output of the turbine is 180kW. (a) What are the heat losses from the turbine? (b) What would be the power output if the steam supplied to the throttle valve were expanded isentropically to the final pressure?

3.) The steam rate to a turbine for variable output is controlled by a throttle valve in the inlet line. Steam is supplied to the throttle valve at 1,700 kPa and 225°C. During a test run, the pressure at the turbine inlet is 1000 kPa, the exhaust steam at 10 kPa has a quality of 0.95, the steam flow rate is 0.5 kg/s, and the power output of the turbine is 180kW. (a) What are the heat losses from the turbine? (b) What would be the power output if the steam supplied to the throttle valve were expanded isentropically to the final pressure?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

In a marine gas turbine unit, a high-pressure stage turbine drives the compressor and a low-pressure stage turbine drives the propeller through suitable gearing. The overall pressure ratio is 4/1 and the maximum temperature is 650 oC. the isentropic efficiencies of the compressor, H. P. turbine, L. P. turbine are 0.8, 0.83 and 0.85 respectively and the mechanical efficiency of both shafts is 98 %. Sketch the process on the T-s diagram Calculate the pressure between turbine stages when the air intake conditions are 1.01 bar and 25 oC. Calculate also the thermal efficiency and the shaft power when the mass flow is 60 kg/s. NB: Neglect kinetic energy changes and the pressure loss in combustion.
A certain Geothermal Power Plant shows that 1,700,000 kg/hr of pressurized ground water is available at 17.5MPa and 330°C. The water will be throttled to a pressure of 1.7MPa to produce wet steam and this mixture will be passed through a water separator to remove the water droplets so that saturated steam at 1.7MPa is available at the entrance of the Turbine. Other data are as follows: Discharge Pressure of turbine = 85kPa-Vac; Turbine Efficiency = 73%. Mechanical Loss = 2% of shaft power. Generator Efficiency = 95%. Determine the following: 1.The mass flow rate, in kg/min, of steam entering the turbine. a. 153,720 b . 76,858 c. 38,430 d. 19,200 e. 9,350 2. The maximum amount of power, in kW, that the plant can generate. a. 38,430 b. 19,200 c. 76,858 d. 9,350 e. 153,720
5. A single-acting, twin-cylinder 15.25 x 15.25-cm compressor receives saturated ammonia vapor at - 18 degrees * C and discharges it at 1514.3 kPa. The system is used to produce ice at a final temperature of - 10 degrees * C from water at 27 degrees * C . The compressor runs at 450 rpm with an actual volumetric efficiency of 78%. Assume compression and mechanical efficiencies to be 82% and 88%, respectively. Calculate the following: (a) capacity of the system in tons of refrigeration, (b) brake hp required by the compressor, (c) tons of ice produced per day if compressor runs only 20 hours a day. Assume losses to be 10% of the refrigeration required to produce the ice, and (d) ideal and actual COP.
Air enters the compressor of a regenerative gasturbine engine at 310 K and 100 kPa, where it is compressed to 900 kPa and 650 K. The regenerator has an effectiveness of 80 percent, and the air enters the turbine at 1400 K. For a turbine efficiency of 90 percent, determine the thermal efficiency. Assume variable specific heats for air.
3. Steam enters the turbine at the rate of 1.5 kg/s with enthalpy of 2300 kJ/kg and exhaust enthalpy of 1200 kJ/kg. Steam is extracted from the turbine at a rate of 0.87 kg/s for heating purposes with enthalpy of 2570 kJ/kg. What is the turbine work, in HP? draw a diagram and show full solution
Air enters the compressor of a gas turbine at a pressure of 100 kPa and a temperature of 300 K, where it is compressed to a temperature of 680 K. The pressure ratio of the cycle is 8. Before entering the turbine, there is a heat transfer of 950 kJ/kg to the air. Since the turbine's isentropic efficiency is 84 percent,a) Show the cycle in the T-s diagram.b) The ratio of the work required to operate the compressor to the work obtained from the turbine.c) Calculate the thermal efficiency.(Ignore the variation of specific heats for air with temperature)
A flashed-steam geothermal power plant is located where underground hot water is available as saturated liquid at 725 kPa, The well head pressure is 670 kPa. The flashed steam enters a turbine at 645 kPa and expands to 15 kPa, when it is condensed. The flow rate from the well is 33.3 kg/s. Determine: Draw the T-S diagram The mass flow rate of steam in kg/s The power produce in KW The cooling water flow in kg/s if water is available at 25 oC and a 15°C rise is allowed through the condenser.
In an air standard gas turbine cycle, air at 14.5 psia and 70 F is first compressed to 80 psia in a compressor of 82 percent efficiency. The hot air leaving the combustion chamber at 1250 F is expanded back to 14.5 psia in a turbine of 85 percent efficiency. If a regenerator is inserted into the cycle to heat the air leaving the compressor to 650 F. (a) determine the thermal efficiency of the cycle. (b) determine the effectiveness of the regenerator. Show complete solution on a paper.
PROBLEM: A flashed-steam geothermal power plant is located where underground hot water is available as saturated liquid at 715 kPa, The well head pressure is 680 kPa. The flashed steam enters a turbine at 635 kPa and expands to 15 kPa, when it is condensed. The flow rate from the well is 35.3 kg/s. Determine: Draw the T-S diagram The mass flow rate of steam in kg/s The power produce in KW The cooling water flow in kg/s if water is available at 25 oC and a 15°C rise is allowed through the condenser.
a 140x140-mm, twin-cylinder, single acting refrigerant-12 compressor running at 600 rpm carries a refrigeration capacity of 40kW while operating at 350 kPa suction and 1300 kPa discharge pressures, assuming the same load to be carried with the same volumetric efficiency and if the discharge pressure shall be raised to 1400 kPa, a) what is the percent increase in mass of R-12 b.) what will be the new volumetric displacement of the compressor in m3/sec c.) at what speed should the compressor be run?
A single-acting, twin cylinder 15.25 x 15.25-cm. compressor receives saturated ammonia vapor at -18°C and discharges it at 1514.3 kPa. The system is used to produce ice at a final temperature of-10°C from water at 27°C. The compressor runs at 450 rpm with an actual volumetric efficiency of 78%. Assume compression and mechanical efficiencies to be 82% and 88%, respectively. Calculate the following: (a) capacity of the system in tons of refrigeration, (b) brake hp required by the compressor, (c) tons of ice produced per day if compressor runs only 20 hours a day. Assume losses to be 10% of the refrigeration required to produce the ice, and (d) ideal and actual COP Ans. (a) 17.04 TR, (b) 32 hp, (c) 8.37 tons, (d) 3.4, 2.79 SOLVE PROPERLY
A Brayton cycle with a pressure ratio of 15 operates with air entering the compressor at 70 kPa and 0°C, and the turbine at 600°C. Calculate the net specific work produced by this cycle treating the air as an ideal gas with constant specific heats.