In Rankine cycle, the working fluid undergoes phase change,
while in other cycles the working fluid remains in the same
phase.
This is the difference between Ranking and other cycles. So, option
(b) is correct.
Which of the following processes involves pure substance phase change? a) Otto cycle b) Rankine cycle...
16 5 points Which of the following processes complete the Otto thermodynamic cycle used in vehicles that use gasoline as fuel: constant volume heat addition constant pressure heat addition constant pressure heat rejection to cooling tower isentropic compression of gas or vapor isentropic compression of liquid o O isentropic expansion U heat rejection by an exchange of a constant volume with ambient air 17 5 points Which of the following processes complete the Rankine steam thermodynamic cycle used in power...
Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.35. The compression ratio is 10 for the modified cycle. At the beginning of compression, p1 = 1 bar and T1 = 310 K. The maximum temperature during the cycle is 2200 K. Determine: (a) the heat transfer and work in kJ per kg of air for each process in the modified cycle. (b) the...
Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.25. The compression ratio is 8 for the modified cycle. At the beginning of compression, p1 = 1 bar and T1 = 310 K. The maximum temperature during the cycle is 2200 K. Determine: (a) the heat transfer and work in kJ per kg of air for each process in the modified cycle. (b) the...
Question 5 2 Points It is the type of stroke in an Otto cycle where fuel vapor and air are ignited A Exhaust B Compression C Intake D Combustion Question 6 2 Points Which of these refrigerant is not grouped as inorganic? A Ammonia B) Iso-Butane c) Water D Carbon Dioxide Question 7 2 Points Among these refrigerants, which has the highest Ozone Depletion Potential? A Ammonia BR-22 C) R-134a D R-11 Question 8 2 points The phase of the...
3: Consider the Rankine power cycle using vapor and liquid. a: Explain what kinds of problems the Carnot Vapor Cycle has. b: Draw a T-s diagram for the ideal Rankine cycle and label each process explicitly c: There is a method to lower the condenser pressure (or to decrease the average low temperature) in order to improve the efficiency of the ideal Rankine cycle. Explain its advantages and disadvantages explicitly. d: Name the gas power cycle which uses the same...
Which of the following is incorrect? A. A change in phase is not accompanied by a change in temperature. B. Kinetic energy of a chemical system involves the energy of motion of atoms, ions, and molecules in the system. C. A bomb calorimeter measures heat exchange at constant volume. D. A substance in a solid state which changes directly to a gas has undergone a sublimation reaction. E. All of the above statements are correct.
5. Which of the following does not improve the efficiency of Rankine Cycle a. Increasing the condenser temperature b. Lowering the condenser pressure b. Superheating the steam to high temperature d. Increasing the boiler pressure 6. For the ideal vapor-compression cycle, the phase description at the compressor inlet is: a. Saturated Mixture b. Superheated Vapor c. Saturated Liquid d. Saturated Vapor 7. For the ideal vapor-compression cycle, the expansion valve is used to: a. Increases the refrigerator pressure b. Increases...
Consider the following figure Otto cycle Heating at constant volume (fuel combustion) Он 3) Adiabatic expansion power stroke ed 0 rV Adiabatic compression (compression stroke) Cooling at constant volume (cooling of exhaust gases) (a) For the Otto cycle shown in the figure above, calculate the changes in entropy of the gas in each of the constant-volume processes b 无, and Td and the number of moles n and the heat capacity Cv of the gas. (Use any variable or symbol...
Water is the working substance for an ideal Rankine cycle. The condenser pressure is equal to 7.5 kPa. The boiler pressure is 8 MPa. Find: a) The specific work required by the pump b) The specific heat addition for the boiler c) The specific heat rejection for the condenser d) The specific work out of the turbine e) The thermal efficiency of the cycle 2. Solve problem 1, but this time assuming that the temperature at the inlet of the...
3.6 A combined power plant consisting of a closed cycle GT unit (Brayton cycle), using air as the working fluid and a ST unit (Rankine cycle) is to be designed such that the heat rejected at the GT unit is to be utilized to produce steam at the generator for the ST. The air leaving the generator is at 200 °C and it is cooled to the compressor inlet temperature by a second cooler which rejects the heat to waste....