CONNECT FOR THERMODYNAMICS: AN ENGINEERI
9th Edition
ISBN: 9781260048636
Author: CENGEL
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Videos
Question
Chapter 10.9, Problem 72P
To determine
Consider a converging nozzle with a low velocity at the inlet and sonic velocity at the exit plane. Now the nozzle exit diameter is reduced by half while the nozzle inlet temperature and pressure are maintained the same. The nozzle exit velocity will
- (a) Remain the same
- (b) Double
- (c) Quadruple
- (d) Go down by half
- (e) Go down by one-fourth
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The gas turbine in the power generation building is a vital element of the performance and financial viability of the whole plant.
Investigate the principles of operation of the gas turbine and relate your findings to the design, running and maintenance of such a system.
Data are provided for two reversible refrigeration cycles. One cycle operates between hot and
cold reservoirs at 27°C and 3°C, respectively. The other cycle operates between the same hot
reservoir at 27°C and a cold reservoir at -35°C. The refrigerator removes the same amount of
energy by heat transfer from its cold reservoir.
Determine the ratio of the net work input values of the two cycles,
WCycle,2
Wcycle,1
A power plant has an overall efficiency of 40%. The plant generates 40 MW of electricity and uses coal from Utah (see the table below) as fuel.
The Typical Heating Value of Some Coal
Coal from County and State of
Higher Heating Value (Btu/lbm)
Musselshell, Montana
12,075
Emroy, Utah
13,560
Pike, Kentucky
15,040
Cambria, Pennsylvania
15,595
Williamson, Illinois
13,710
McDowell, West Virginia
15,600
Determine how much coal must be burned (in lbm/h) to sustain the generation of 40 MW of electricity.
lbm/h
Chapter 10 Solutions
CONNECT FOR THERMODYNAMICS: AN ENGINEERI
Ch. 10.9 - Why is the Carnot cycle not a realistic model for...Ch. 10.9 - Why is excessive moisture in steam undesirable in...Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - Consider a steady-flow Carnot cycle with water as...Ch. 10.9 - Water enters the boiler of a steady-flow Carnot...Ch. 10.9 - What four processes make up the simple ideal...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...
Ch. 10.9 - How do actual vapor power cycles differ from...Ch. 10.9 - Compare the pressures at the inlet and the exit of...Ch. 10.9 - The entropy of steam increases in actual steam...Ch. 10.9 - Is it possible to maintain a pressure of 10 kPa in...Ch. 10.9 - A simple ideal Rankine cycle with water as the...Ch. 10.9 - A simple ideal Rankine cycle with water as the...Ch. 10.9 - A simple ideal Rankine cycle which uses water as...Ch. 10.9 - Consider a solar-pond power plant that operates on...Ch. 10.9 - Consider a 210-MW steam power plant that operates...Ch. 10.9 - Consider a 210-MW steam power plant that operates...Ch. 10.9 - A simple ideal Rankine cycle with water as the...Ch. 10.9 - A simple ideal Rankine cycle with water as the...Ch. 10.9 - A steam Rankine cycle operates between the...Ch. 10.9 - A steam Rankine cycle operates between the...Ch. 10.9 - A simple Rankine cycle uses water as the working...Ch. 10.9 - The net work output and the thermal efficiency for...Ch. 10.9 - A binary geothermal power plant uses geothermal...Ch. 10.9 - Consider a coal-fired steam power plant that...Ch. 10.9 - Show the ideal Rankine cycle with three stages of...Ch. 10.9 - Is there an optimal pressure for reheating the...Ch. 10.9 - How do the following quantities change when a...Ch. 10.9 - Consider a simple ideal Rankine cycle and an ideal...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - An ideal reheat Rankine cycle with water as the...Ch. 10.9 - Steam enters the high-pressure turbine of a steam...Ch. 10.9 - An ideal reheat Rankine cycle with water as the...Ch. 10.9 - A steam power plant operates on an ideal reheat...Ch. 10.9 - Consider a steam power plant that operates on a...Ch. 10.9 - Repeat Prob. 1041 assuming both the pump and the...Ch. 10.9 - Prob. 43PCh. 10.9 - Prob. 44PCh. 10.9 - How do open feedwater heaters differ from closed...Ch. 10.9 - How do the following quantities change when the...Ch. 10.9 - Cold feedwater enters a 200-kPa open feedwater...Ch. 10.9 - In a regenerative Rankine cycle. the closed...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - Consider an ideal steam regenerative Rankine cycle...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - Repeat Prob. 1060, but replace the open feedwater...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - A simple ideal Rankine cycle with water as the...Ch. 10.9 - Prob. 64PCh. 10.9 - An ideal reheat Rankine cycle with water as the...Ch. 10.9 - Consider a steam power plant that operates on a...Ch. 10.9 - Prob. 67PCh. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - The schematic of a single-flash geothermal power...Ch. 10.9 - What is the difference between cogeneration and...Ch. 10.9 - Prob. 71PCh. 10.9 - Prob. 72PCh. 10.9 - Consider a cogeneration plant for which the...Ch. 10.9 - Steam is generated in the boiler of a cogeneration...Ch. 10.9 - A large food-processing plant requires 1.5 lbm/s...Ch. 10.9 - An ideal cogeneration steam plant is to generate...Ch. 10.9 - Steam is generated in the boiler of a cogeneration...Ch. 10.9 - Consider a cogeneration power plant modified with...Ch. 10.9 - Prob. 80PCh. 10.9 - Why is the combined gassteam cycle more efficient...Ch. 10.9 - The gas-turbine portion of a combined gassteam...Ch. 10.9 - A combined gassteam power cycle uses a simple gas...Ch. 10.9 - Reconsider Prob. 1083. An ideal regenerator is...Ch. 10.9 - Reconsider Prob. 1083. Determine which components...Ch. 10.9 - Consider a combined gassteam power plant that has...Ch. 10.9 - Prob. 89PCh. 10.9 - What is the difference between the binary vapor...Ch. 10.9 - Why is mercury a suitable working fluid for the...Ch. 10.9 - Why is steam not an ideal working fluid for vapor...Ch. 10.9 - By writing an energy balance on the heat exchanger...Ch. 10.9 - Prob. 94RPCh. 10.9 - Steam enters the turbine of a steam power plant...Ch. 10.9 - Consider a steam power plant operating on the...Ch. 10.9 - A steam power plant operates on an ideal Rankine...Ch. 10.9 - Consider a steam power plant that operates on a...Ch. 10.9 - Repeat Prob. 1098 assuming both the pump and the...Ch. 10.9 - Consider an ideal reheatregenerative Rankine cycle...Ch. 10.9 - Prob. 101RPCh. 10.9 - A textile plant requires 4 kg/s of saturated steam...Ch. 10.9 - Consider a cogeneration power plant that is...Ch. 10.9 - Prob. 104RPCh. 10.9 - Prob. 105RPCh. 10.9 - Reconsider Prob. 10105E. It has been suggested...Ch. 10.9 - Reconsider Prob. 10106E. During winter, the system...Ch. 10.9 - Prob. 108RPCh. 10.9 - Prob. 109RPCh. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - A Rankine steam cycle modified for reheat, a...Ch. 10.9 - Show that the thermal efficiency of a combined...Ch. 10.9 - Prob. 118RPCh. 10.9 - A solar collector system delivers heat to a power...Ch. 10.9 - Starting with Eq. 1020, show that the exergy...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle. If the...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a steady-flow Carnot cycle with water as...Ch. 10.9 - Prob. 126FEPCh. 10.9 - Prob. 127FEPCh. 10.9 - A simple ideal Rankine cycle operates between the...Ch. 10.9 - Pressurized feedwater in a steam power plant is to...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - Consider a combined gas-steam power plant. Water...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Consider a heat pump that operates on the ideal vapor-compression refrigeration cycle with R-134a as its working fluid between the pressure limit of 0.32 and 1.2 MPa. Determine the coefficient of performance of this heat pump and processes where exergy is destroyed.arrow_forwardDemonstrate the modifications that can be carried out to improve the performance of the power plants.arrow_forwardPlease could you explain to me how to solve this exercise Consider a modified cogeneration power plant with regeneration. Steam enters the turbine at 6MPa and 450ºC at a rate of 20Kg/s, and expands to a pressure of 0.4MPa. At this pressure 60% of the water vapour is extracted from the turbine, and the rest is expanded to a pressure of 10KPa. Part of the extracted steam is used to heat the feed water in an open feed water heater. The rest of the extracted vapour is used for process heating, and leaves the process heater as a saturated liquid at 0.4MPa. It is then mixed with the feed water leaving the feed water heater, and the mixture is pumped to boiler pressure. The vapour in the condenser is cooled and condensed by cooling water from a nearby river, which enters the adiabatic condenser at a rate of 463Kg/s. Consider the ideal equipment and demonstrate the enthalpy values shown a) The temperature rise of the river cooling water in the condenser is: (R=8°C) b) The mass flow of steam…arrow_forward
- 1. A geothermal-based trigeneration plant produces 2.5 MW of electricity, 1.8 MW of process heat, and 1.4 MW of cooling. Electricity is produced for a period of 7500 h, heating for 2500 h, and cooling for 2000 h per year. The energy of geothermal plant consumed in the plant is 4 × 107 kWh during an entire year period. Determine the annual average utilization factor of this plant.arrow_forwardWhat are the types of thermodynamic cycle as to the type of output? Define each.arrow_forward(c) Consider a house whose annual air-conditioning load is estimated to be 120,000 kWh. The unit cost of electricity is RM0.218/kWh. Two air- conditioners are considered. Air-conditioner Daekon has a seasonal average COP of 3.3 and cost RM3299 to purchase and RM200 to install. Air conditioner Panasini has a seasonal average COP of 5.0 and cost RM6199 to purchase and RM300 to install. Each air-conditioner requires RM50 service fee each year. All else being equal, determine which air-conditioner is a better buy in a long run.arrow_forward
- Consider a building whose annual air-conditioning load is estimated to be 40,000 kWh in an area where the unit cost of electricity is RM0.10/kWh. Two air conditioners (Figure 2) are considered for the building. Air conditioner A has a seasonal average COP of 2.3 and costs RM5500 to purchase and install. Air conditioner B has a seasonal average COP of 3.6 and costs RM7000 to purchase and install. All else being equal, determine which air conditioner is a better buy. A Air cond. COP = 2.3 D Win House 40,000 kWh Figure 2 40,000 kWh B Air cond. COP = 3.6 Winarrow_forwardProblem 2 Calculate the thermal efficiency or coefficient of performance of following cycles, and determine if the cycles are reversible, irreversible, or impossible. (a) A steam power cycle that receives heat input 1000 kJ while producing a network output 550 kJ, when interacting with two thermal reservoirs at temperatures of 700°C and 20°C. (b) A refrigeration cycle that needs 10 kJ work input to remove heat of 120 kJ to cool a room when interacting with two the inside and outside temperatures are at 20°C and 45°C.arrow_forwardPlease solve the problem quickly and correctly for upvotesarrow_forward
- heat engine operates between the maximum and minimum temperatures of 6710 C and 600 C respectively, with an efficiency of 50% of the appropriate Carnot efficiency. It drives a heat pump which uses river water at 4.40 C to heat a block of flats in which the temperature is to be maintained at 21.10 C. Assuming that a temperature difference of 11.10 C exists between the working fluid and the river water, on the one hand, and the required room temperature on the other, and assuming the heat pump to operate on the reversed Carnot cycle, but with a COP of 50% of the ideal COP, determine the heat input to the engine per unit heat output from the heat pump.arrow_forwardi need the answer quicklyarrow_forwardA Carnot cycle has a thermal efficiency of 32%. If the work developed is 1000 watt-hour, determine the heat supplied. Group of answer choices 670 665 680 650arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
Mechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSON
Thermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEY
Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
Engineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
Power Plant Explained | Working Principles; Author: RealPars;https://www.youtube.com/watch?v=HGVDu1z5YQ8;License: Standard YouTube License, CC-BY