3-Consider a steady-flow Carnot cycle with water as the working fluid executed under the saturation dome between the pressure limits of 8 MPa and 20 kPa. Water changes from saturated liquid to saturated vapor during the heat addition process. The net work output of this cycle is (a) 494 kJ/kg (b) 975 kJ/kg (c) 596 kJ/kg (d) 845 kJ/kg (e) 1148 kJ/kg

3-Consider a steady-flow Carnot cycle with water as the working fluid executed under the saturation dome between the pressure limits of 8 MPa and 20 kPa. Water changes from saturated liquid to saturated vapor during the heat addition process. The net work output of this cycle is (a) 494 kJ/kg (b) 975 kJ/kg (c) 596 kJ/kg (d) 845 kJ/kg (e) 1148 kJ/kg

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

The working substance for a carnot cycle is 8 lb of air. the volume at the beginning of isothermal expansion is 9 cubic feet and the pressure 300psia. the ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90 degree farenheit. Find (a) Qa,(b) Qb,(c) V3,(d) P3,(e) V4,(f) P4,(g) Pm, (h) the ratio of expansion during the isentropic process, and (i) the overall ratio of compression.
The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal expansion is 9 cubic feet and the pressure is 300 psi. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90 degrees Fahrenheit . NOTE: Indicatethe pV and TS planes Find: - QA(heat added) - QR(heat rejected) - MEP(cycle mean effective pressure) -the ratio of expansion during the isentropic process - the overall ratio of compression.
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.
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 Carnot engine uses ethylene as its medium. The volumes at the beginning and end of the reversible adiabatic expansion process are 0.1 ft^3 and 2.5 ft^3, respectively. Fund the thermal efficiency.
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.
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 o 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 i. Calculate the pressure between turbine stages when the air intake conditions are 1.01 bar and 25 oC. ii. 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.
An industrial plant needs 20,000 lbm of saturated steam at 280oF per hour for heating purposes and ten MW of electrical power. A small turbine system is to be designed to handle both of these needs. Steam is supplied to a turbine at 400 psia pressure from a boiler and expanded until 280oF saturated steam is obtained whereupon the steam needed for heating is extracted. The rest of the steam is expanded in a second turbine to a condenser pressure of 5 psia, where it is condensed, compressed to 400 psia and returned to the boiler. The heating steam returns as a liquid at 200oF and 1 atm pressure where it is compressed to 400 psia and returned to the boiler. Both turbines have an efficiency of 72% and both feed water pumps have an efficiency of 50%. The power from the turbines is used to drive the feed water pumps. (a) At what temperature must the steam be generated in the boiler to supply the 280oF saturated heating steam? (b) How much steam must the boiler supply? (c) If one pound of…
developing 60kw of refrigeration using refrigerant R134a with condensing temperature 400C and evaporating -30 oC vapor is superheated before entering the compressor by 5 oC while the liquid will be sub-cooled by 6 oC, CalculateThecoefficient of performance and The total work done in the cycle and The mass flow rate of the refrigerant
Refrigerant R-134a to the compressor of a refrigeration machine It enters at 140 kPa pressure and -10 °C, and exits at 1 MPa pressure. Volumetric flow of the refrigerant entering the compressor It is 0.23 m³/minute. The refrigerant enters the throttling valve at a pressure of 0.95 MPa and at 30 °C, and exits the evaporator as saturated steam at -18 °C. Adiabatic efficiency of the compressor It is 78%. Show the cycle in the T-s diagram. And; a) Calculate the power required to run the compressor. b) Calculate the heat absorbed per unit time from the cooled medium. ( COPSM=? ) c) Calculate, between the evaporator and the compressor, how much the pressure of the refrigerant drops and how much the heat gain.
An ammonia ice plant operates between a condenser temperature of 35oC andevaporator of –15oC. It produces 10 metric tons of ice per day from water at 30oCto ice at –5oC. Assuming simple saturation cycle, determine the horsepower ofthe motor if the adiabatic efficiency of the compressor ηc = 0.80 and mechanicalefficiency ηm = 0.90. The specific heat of ice is 2.094 kJ/kg.oC and the latent heatis 335 kJ/kg. From the table for ammonia the following enthalpies are: condenserentrance = 1703 kJ/kg, exit = 366.1 kJ/kg; compressor entrance = 1443.9 kJ/kg,exit = 1703 kJ/kg A. 14.55 hp B. 24.55 hp C. 34.55 hp D. 44.55 hp
Superheated steam enters the first stage of a steam turbine at 2.5 MPa and 300°C. the steam leaves the first stage at a pressure of 500 kPa and returns to the steam generator, which leaves at a temperature of 300 ºC and re-enters the second stage of the turbine, which finally leaves at 10kPa. Evaluate the efficiency of the cycle and the quality of the steam at the outlet of the two stages of the turbine.