Problem Statement A Rankine cycle with a closed feedwater heater operates with a steam generator pressure of 140 bar, a condenser pressure of 6 kPa, and extracts 14% of the steam flow at 30 bar. The extracted steam leaves the feedwater heater as a saturated liquid. The steam generator exit is superheated by 200°C. The turbines have an isentropic efficiency of 90% and the pump is isentropic. The condenser exit is a saturated liquid. Determine the thermal efficiency of the cycle. Answer Table Correct Answer Stage Description Your Answer Due Date Grade (%) Part Weight Attempt Action/Message Туре 1 Thermal efficiency (%) Nov 28, 2024 11:59 pm 0.0 1 1/5 Submit * Correct answers will only show after due date has passed.

Problem Statement A Rankine cycle with a closed feedwater heater operates with a steam generator pressure of 140 bar, a condenser pressure of 6 kPa, and extracts 14% of the steam flow at 30 bar. The extracted steam leaves the feedwater heater as a saturated liquid. The steam generator exit is superheated by 200°C. The turbines have an isentropic efficiency of 90% and the pump is isentropic. The condenser exit is a saturated liquid. Determine the thermal efficiency of the cycle. Answer Table Correct Answer Stage Description Your Answer Due Date Grade (%) Part Weight Attempt Action/Message Туре 1 Thermal efficiency (%) Nov 28, 2024 11:59 pm 0.0 1 1/5 Submit * Correct answers will only show after due date has passed.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Steam is the working fluid in an actual Rankine cycle. Steam enters the turbine at 8.0 MPa and 550 deg. C; and saturated liquid exits the condenser at a pressure of 0.008 MPa. The net power output of the cycle is 110 MW. The turbine and the pump each have an isentropic efficiency of 83% Illustrate and label the TS diagram and determine the cycle (a) the cycle thermal efficiency (b) the back work ratio (c)the mass flow rate of the steam, in kg/h, (d) the rate of heat transfer into the working fluid as it passes through the boiler, in MW, (e) the rate of heat transfer, from the condensing steam, as it passes through the condenser, in MW, (f) the mass flow rate of the condenser cooling water, in kg/hr., if cooling water enters the condenser at 15 deg. C and exits at 35 deg. C.
A simple rankine ideal cycle with water as the working fluid. Twenty kilograms of steam enters the turbine at 7.1111 MPa and 500.1111 oC and is cooled in the condenser at a pressure of 10.1111 KPa by running cooling water from a lake through the tubes of the condenser at rate of 2000 kg. Show the T-s diagram and schematic of simple rankine cycle. For cycle determin (a) the turbine work, (b) the heat added, (c) the temperature rise of the cooling water, (d) the thermal efficiency of the cycle. For engine, determine (e) the heat added, (f) the thermal efficiency of the engine, and (g) Draw the T-s and schematic diagram.
An ideal vapor-compression cycle uses R-134a as the working fluid. Recall that the compressor receives refrigerant from the evaporator at Pevap then delivers refrigerant to the condenser at some higher pressure, Pcond. It is also important to know that the condenser and evaporator operate isobarically. For the refrigeration system of interest here, the evaporator and condenser operate at 1.4 bar and 9 bar, respectively. The refrigerant enters the compressor at −10°C (state 1) and exits the condenser (state 3) at 32°C. The compressor operates adiabatically and steadily consumes 4.8 kW of power. The mass flow rate of the refrigerant through the cycle is 7 kg/min. a) What is the exit temperature of the refrigerant out of the compressor? b) The expansion valve is a throttling device. The outlet pressure of the throttling valve is the same as the inlet pressure of the evaporator. What is the quality of the refrigerant at the exit of the expansion valve (state 4)? c) What is the rate of heat…
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A ideal rankine power plant cycle uses ammonia as the working fluid.Saturated vapor leaves the boiler at a temperature of 85 o C. The condenser temperatureis 40 o C. Calculate the heat transfer to the boiler, the work done by the turbine, and thethermal efficiency of the cycle.
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6. An ideal Rankine cycle operates between a boiler pressure of 4 Mpa and a condenser pressure of 10 kpa. The exit steam from the turbine should have a quality of 96% and the power output of the turbine should be 80MW. Determine 8. The minimum boiler exit temperature The efficiency of the cycle The mass flow rate of steam a. b. C.
The engine on a steam ship runs on the Rankine cycle. The steam leaves the boiler at 20 bar and 350°C. The turbine has an efficiency of 75% and an outlet pressure of 1 bar. The pressure changes in the boiler and condenser can be considered negligible, and the liquid leaving the condenser is saturated. A. Determine the operating temperature of the condenser, and compute the efficiency of a Carnot cycle operating between the boiler and condenser temperatures. B. Determine the actual efficiency of this Rankine cycle and compare it to the Carnot efficiency. C. When the Titanic was sinking, the Carpathia received the S.O.S. and immediately set course to attempt a rescue. The captain of the Carpathia ordered the hot water turned off in the passengers’ cabins (Lord, 1955). What effect do you expect this action had?
The net work for a given reheat Rankine cycle is 80MW. Steam at 10 MPa and 500C enters the first turbine and then, the second turbine at 1.2 MPa and 500C. Saturated liquid exits the condenser at 20 kPa. Draw the schematic and T-S diagrams. Label the points by setting point 1 at the condenser outlet, point 2 at the pump outlet, point 3 at the boiler outlet, point 4 at the reheater inlet, point 5 at the reheater outlet, and point 6 at the condenser inlet. Use 2 decimal places for the enthalpy and other energies in solving and for the final answers. For the steam quality (x) and entropy (s), use 4 decimal places in solving. For the specific volume, use 6 decimal places. IMPORTANT: USE THE STEAM TABLES FROM CENGEL'S BOOK ONLY (uploaded already in the files section). Determine the following: Enthalpy at point 2 in kJ/kg = Enthalpy at point 4 in kJ/kg = Enthalpy at point 5 in kJ/kg = Enthalpy at point 6 in kJ/kg = Thermal Efficiency in % = Heat added in kJ/kg = Heat rejected in…
Consider the ideal vapor compression cycle operating between 1.4 bar and 9bar using R-125 as the refrigerant, which removes heat from a cold space at a rate of 100kW. If the evaporator outlet was suddenly superheated by 2℃ above saturation, what will be the resulting effect on the cycle? a.Refrigerant flowrate will decrease, Condenser duty will decrease b.Refrigerant flowrate will increase, Condenser duty will decrease c.Refrigerant flowrate will increase, Condenser duty will increase d.Refrigerant flowrate will decrease, Condenser duty will increase
1. Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of45 MW. Steam enters the turbine at 7 MPa and 500°C and iscooled in the condenser at a pressure of 10 kPa by runningcooling water from a lake through the tubes of the condenserat a rate of 2000 kg/s. Show the cycle on a T-s diagram withrespect to saturation lines, and determine (a) the thermal efficiency of the cycle, (b) the mass flow rate of the steam, and(c) the temperature rise of the cooling water. Answers:(a) 38.9 percent, (b) 36 kg/s, (c) 8.4°C 2. Consider a 210-MW steam power plant that operateson a simple ideal Rankine cycle. Steam enters the turbine at10 MPa and 500°C and is cooled in the condenser at a pressure of 10 kPa. Show the cycle on a T-s diagram with respectto saturation lines, and determine (a) the quality of the steamat the turbine exit, (b) the thermal efficiency of the cycle,and (c) the mass flow rate of the steam. Answers: (a) 0.793,(b) 40.2 percent, (c) 165…
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