*81. GO An irreversible engine operates between temperatures of 852 and314 K. It absorbs 1285 J of heat from the hot reservoir and does 264 J ofwork. (a) What is the change ASumiverse in the entropy of the universe associ-ated with the operation of this engine? (b) If the engine were reversible, whatwould be the magnitude |W| of the work it would have done, assuming that itoperated between the same temperatures and absorbed the same heat as theirreversible engine? (c) Using the results of parts (a) and (b), find the differ-ence between the work produced by the reversible and irreversible engines.

Given data: The temperature of the source is; T1=852 K. The temperature of the sink is; T2=314 K.…

Answered: *81. GO An irreversible engine operates…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A turbine operates under steady flow conditions, receiving steam at the following state: pressure 1200 KPa, temperature 1880°C, enthalpy 2785 KJ/kg, speed 33.3 m/s and elevation 3 m. The steam leaves the turbine at the following pressure 20 KPa, enthalpy 2512 KJ/kg, speed 100 m/s and elevation 0 m. Heat is lost to the surroundings at the rate of 0.29 KJ/s. If the rate of steam flow through the turbine is 0.42 kg/s. Find: A. Potential Energy 1, KJ/kg. B. Potential Energy 2 in KJ/kg. C. Kinetic Energy 1 in KJ/kg. D. Kinetic Energy 2 in KJ/kg. E. Heat Energy in KJ/kg. F. Power Output in KW.
A turbine operates under steady flow conditions, receiving steam at the following state: pressure 1200kPa, temperature 188℃, enthalpy 2785 KJ/kg, speed=33.3m/s and elevation of 3m . The steam leaves the turbine at the following state; pressure=20kPa, enthalpy 2512 kJ/kg. Speed 100m/s and elevation 0 m. Heat is lost to the surroundings at the rate of 0.29 kJ/s. If the rate of steam flow through a turbine is 0.42 kg/s, what is the power output of the turbine in kW?
2. There are developed 10hp by a Carnot engine between 1000F and 100F. Determine;a. The thermal efficiencyb. The heat supplied per secondsc. The change in entropy each second during heat rejection
It is proposed that a nozzle receive air at 2 m/s, 300 K, and 150 kPa, attemperature of 280 K, and a velocity of 100 m/s. The mass flow rate is 0.1 kg/s. The surface of the nozzle is kept at 270 K. Assuming that the air behaves as an ideal gas with constant specific heats. Is this process possible?Given: Vel1 = 2 m/s, T1 = 300 K, P1 = 150 kPa, Vel2 = 100 m/s, T2 = 280 K, P2 = 110 kPa, dm/dt = 0.1 kg/s, Cp,air = 1.005 kJ kg-1 K-1
A turbine operates under steady flow conditions, receiving steam at the following state: pressure 1200 kPa, temperature 1880C, enthalpy 2785 kJ/kg, speed 33.3 m/s, and elevation 3 m. The steam leaves the turbine at the following pressure 20 kPa, enthalpy 2512 kJ/kg, speed 100 m/s, and elevation 0 m. Heat is lost to the surroundings at the rate of 0.29 kJ/s. If the rate of steam flow through the turbine is 0.42 kg/s, what is the power output of the turbine in kW?
1.) While the pressure remains constant at 100 psia the volume of a system of air changes from20 ft3to 10 ft3. What are (a) ∆U in Btu, (b) Q in Btu, (c) Wn, Btu2.) Four pounds of air gain 0.491 Btu/R of entropy during a nonflow isothermal process. If p1= 120 psia and V2 = 42.5 ft3find (a) V1 and T1 (b) Q, and (c) Ws with υ1 = 100 ft/sec and υ2 =500 ft/sec.3.) A 1 hp stirring motor is supplied to a tank containing 22.7 kg of air. The stirring action isapplied for 2 hours and the tank losses 850 kJ/hr of heat. Calculate (a) the paddle work inkJ, (b) change of internal in kJ, and (c) the change in temperature of air after 2 hours,assuming that the process occurs at constant volume.4.) A gas with cp = 5.2 kJ/kg.K and R = 2.056 kJ/kg.K initially at 2000 kPa, 3m3and 115oCundergoes an isentropic process to 105 kPa. Find (a) V2 and T2. What is the work (b) if theprocess is nonflow, (c) if the process is steady flow with ΔKE = 10 kJ?
Four pounds of air gain 0.491 Btu/°R of entropy during a nonflow isothermal process. If p1 = 120 psia and V2 = 42.5 ft³, Determine (a) V1 and T1, (b) W, (c) Q and (d) ⧍U.
A gaseous substance whose properties are unknown, except specified, undergoes an internally reversible process during which v=(-0.1p+300)ft3 where p is in psfa. The pressure changes from 1000 psfa to 100 psfa. The process is a steady flow where the change in kinetic energy is 25 Btu, the change in potential energy is negligible, and ∆? = −300 ???, compute for the heat transferred and work done or by the system in kilojoules.
A closed system contains an ideal gas, which molecular weight is W = 63.47 kg/kmol, and its standard state entropy is S0 = 0. The system undergoes the following cycle: at state 1 the temperature is 295.15 K, the pressure is 95 kPa (absolute), and the entropy is 46.450 J/(kg/kmol). The gas is compressed polytropically at n = 1.46 until the specific volume is 10 times lower than that at state 1 ( state 2 ). Then 85651.7 J/kg of heat is added at constant specific volume ( state 3). After that heat is added at constant pressure until entropy is 333.333 J/(kg.K) (state 4). In the next process the system undergoes isentropic expansion (and reaches state 5 ). Finally there is a constant volume rejection of heat (until state 1). Determine a) the values of p, v, T and s, at each cycle point; b) the p-V and T-s diagrams of cycle; c) the heat added to the system; d) the heat rejected by the system; e) the cycle net work; f) the mean effective pressure; g) the cycle thermal efficiency.
Four pounds of air gain 0.491 Btu/°R of entropy during a nonflow isothermal process. If p1 = 120 psia and V2 = 42.5 ft³, find (a) V1 (ft³) and T1 (°R), (b) Wn (Btu), and (c) Q (Btu). And draw the P-V and T-S diagrams
A block of iron ore A of mass m = 10 kg and specific heat capacity C = 460 kJ/(kg·K) obeys the constitutive relations Energy E: E2 − E1 = mC (T2 − T1)Entropy S: S2 − S1 = mC ln (T2/T1) where T is temperature. The block of metal is initially at temperature T1 = 700 K and it is inthe vicinity of a thermodynamic reservoir R, which is at temperature T0 = 298 K and pressurep0 = 101.3 kPa. a) What is the maximum amount of work that can be extracted adiabatically from the metal blockin its initial state (known as the adiabatic availability Psi_1)? b) What is the maximum amount of work that can be extracted adiabatically from the combinationof the metal block A and reservoir R? (known as the available energy, or exergy, Omega_1)? c) Evaluate the energy and entropy changes of system A and reservoir R in part (b). Fournumerical values are required. d) Draw three separate energy-entropy diagrams, one for system A, one for the reservoir R,and one for the combined system AR. Draw on these…
A 30-kg aluminum block (specific heatThe power required to drive the compressor in a Carnot refrigerator is 55 hp. It operates between -4°C and 37°C. Determine the coefficient of performance. -0.973 kJ/kg K) initially at 135°C is brought into contact with a 35-kg block of iron (specific heat-0.45 kJ/kg K) at 65°C in an insulated enclosure. Compute for the final total entropy change for this process in kJ/K. answer must be in 3 decimal places.

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