FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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For a given Rankine Cycle, the difference between the heat added and the heat rejected is not equal to the difference between the turbine work and the pump work.
Group of answer choices
a. True
b. False
Compare the influence of reheating, regeneration and intercooling on performance of gas turbine cycle.
In the case of Brayton cycle with regeneration,
I. the regenerator can not be used when the temperature of compressed air is more than the temperature of exhaust gases from the turbine.
II. the efficiency of the Brayton cycle with regeneration is always greater than the efficiency of the simple Brayton cycle.
Oa.
Only II is true
O b. I and II are true
O c. Only I is true
O d. I and II are false
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- GIVEN: 1. Water in Rankin cycle. 2. Steam leaves steam generator at 1500 lbf/in^2 and 1095F. 3. Because of heat transfer and friction, pressure and temperature at turbine inlet are reduced to 1400 lbf/in^2 and 1000F. 4. Pump and turbine have 90% of isentropic efficiencies. 5. Pressure at inlet of condenser = 2 lbf/in^2. Due to friction, condesate exists condenser at 1.5 lbf/in^2 and 105F. 6. Condensate is pumped to 1600 lbf/in^2 & then enter steam generator. 7. Net power output of whole cycle = 1 x 10^9 Btu/hour. 8. The cooling water temperature increases from 60F to 76F with very little pressure drop as it flows through condenser. DETERMINE: 1. Mass flow rate of steam in lb/s. 2. rate of heat transfer in Btu/s to the working fluid passing through the steam generator. 3. thermal efficiency. 4. Mass flow rate of cooling water in lb/sarrow_forwardSolve the MCQ Consider a simple ideal Rankine cycle with fixed turbine inlet conditions. What is the effect of lowering the condenser pressure on the steam quality at the turbine exit a. Incroase b. Decrease c. Remain the same 2. All radiations in a black body are a. Reflected b. Absorbed c. Transmitted 3. Overall heat transfer coefficient is used for heat transfer problems that include a. Radiation b. Convection c. Conduction and convection 4. A grey body is one whose absorptivity a. varies with temperature b. varies with wavelength of the incident radiation c. equal to its emissivity 5. In a heat exchange, doubling the mass flowrate of a fluid while leaving everything unchanged the temperature change of that fluid will a. decreases by 50% b. increase by 50% c. increases by 100% 6. If a heat exchanger LMTD is zero then heat transfer surface become a. Maximum b. Minimum c. Infinity 7. During stagnation process, kinetic energy of the fluid is converted to a. Enthalpy b. Entropy…arrow_forward2.2arrow_forward
- A power plant operates between pressures of 80 bar and 0.1 bar in an actual Rankine cycle. The maximum cycle temperature is 650 deg. Celsius. for mass flow rate of 5 kg/sec. Condensate pump has an isentropic efficiency 82% and Turbine isentropic efficiency of 93%. Determine: a. Actual Turbine Work (KW) b. Actual Work Net (KW) c. Decrease in efficiency due to irreversibilityarrow_forwardThe second steam power plant operates on a regenerative Rankine cycle, where water is used as the working fluid. Steam enters the turbine at 8 MPa and 450 °C. After isentropic expansion in the first stage of the turbine, steam is extracted at an intermediate pressure of 0.75 MPa and passed to a closed feedwater heater. The feedwater leaves the heater at 8 MPa and a temperature equal to the saturation temperature at 0.75 MPa. The saturated liquid condensate from the feedwater heater leaves at 0.75 MPa and is pumped into the feedwater line. The condenser pressure is 7.5 kPa. The net power output from the cycle is 100 MW. steam generator feed water heater 6 3 p2arrow_forwardFor a Rankine cycle, decreasing minimum pressure while holding all other parameters constant will allow an engineer to make the following statements Group of answer choices The quality at the turbine exit will decrease increasing liquid water content and back stage turbine damage, Turbine net work output will increase due to the reduced pressure at the exit The quality at the turbine exit will increase improving turbine reliability The average temperature at which heat is rejected will increase increasing thermal efficiencyarrow_forward
- Task (1) A Brayton cycle with regeneration operates with a pressure ratio of 7. The minimum and maximum cycle temperatures are 300 K and 1000 K. The isentropic efficiency of the compressor and turbine are 80% and 85%, respectively. The effectiveness of the regenerator is 75%. Use constant specific heats evaluated at room temperature. Discuss the following related to the principles of operation for a gas turbine power plant A. What is the difference between closed and open gas turbine cycle. B. Explain how a closed gas turbine engine can be combined with a Rankine cycle. C. Why Brayton cycle is more preferred compared to Rankin cycle in power plant stations? D. How would you increase the efficiency of a Brayton cycle? E How would you minimize the back work ratio in a Brayton cycle?arrow_forwardIn the case of the actual Reheat Rankine cycle, L. Fluid fniction and heat loss to the surroundings are the two common sources of irreversibilities. II. Due to irreversibilities, more work input is required for the pump. I. Due to irreversibilities, more work output is produced by the turbine. O à Il and Ill are true O b. Only l is true Oc LIl and III are true O d. land Il are truearrow_forwardIn this task, you should base your work on a Rankine cycle with water/steam as the working medium. State 1 (into pump/out of condenser): saturated liquid at 30 kPah1=hf (30 kPa) = 289.27 kJ/kg State 2 (out of pump/into boiler): subcooled liquid at 5 MPah2 = 294.35 kJ/kg State 3 (out of boiler/into turbine): superheated steam at 5 MPa, 600°Ch3 = h(5 MPa, 600°C) = 3666.9 kJ/kg State 4 (out of turbine/into condenser): saturated steam at 30 kPah4 = hg (30 kPa) = 2624.6 kJ/kg The heat added in the boiler was calculated to be Qin,boiler = 16863 kW. The mass flow rate of the working fluid remains 5 kg/s. The pump in this cycle is isentropic (pump power is 25.4 kW), while the turbine is non-isentropic. The temperature of the heat source for the boiler is 1000°C (constant). The condenser transfers waste heat to the surroundings at 15°C and 100 kPa. a) Calculate the power output from the steam turbine (in kW or MW).b) Calculate the isentropic efficiency of the turbine.c) Calculate the…arrow_forward
- The goal of adding a reheat line to a Rankine cycle is to increase the thermal efficiency of the cycle. If an increase of efficiency is achieved, what must be true? O The power input to the pumps is decreased The power output from the turbines is increased more than the heat transfer into the boiler The heat transfer into the boiler in increased more than the power output of the turbines O The heat transfer into the boiler decreasedarrow_forwardQ#1. A gas-turbine plant operates on the regenerative Brayton cycle, the schematic diagram of whichis shown in Fig. Q 1, with two stages of reheating and two-stages of intercooling between the pressure limits of100 and1200 kPa . The working fluid is air. The air enters the first and the second stages of the compressor at 300 K and 350 K , respectively, and the first and the second stages of the turbine at 1400 K and 1300 K , respectively. Assuming both the compressor and the turbine have an isentropic efficiency of 80%. The regenerator has an effectiveness ofεregen=75% . Assume variable specific heats (i.e., use the concept of relative pressures) and the intermediate pressuresof intercooling and reheating is the square root of the product of inlet and exit pressures for intercooling and reheating. Make other the necessary assumptions and determine(a) the back work ratio,β , and the net work output,, wnet(b) the thermal efficiency (that is the first-law efficiency,ηi ) and(c) the…arrow_forwardQuestion: In a Rankine cycle, which of the following processes involves the phase change from liquid to vapor? A) Isentropic compression in a pump B) Isobaric heat addition in a boiler C) Isentropic expansion in a turbine D) Isobaric heat rejection in a condenserarrow_forward
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