FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Apply exergy analysis and calculate the exergy of three pressurised tanks (units: MJ) at the fully charged state. Where relevant, assume constant specific heats for air
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If a throttling valve is connected to the outlet for one of these tanks, whereby air leaves this valve steadily at 305K with a pressure drop of 50bar, apply an exergy balance across the valve and calculate the exergy change (units: kJ/kg).
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- EXPLAIN THE THE DECREASE OF EXERGY PRINCIPLE AND EXERGY DESTRUCTION.arrow_forwarda) Using the second law of thermodynamics, describe exergy d law of thermodynamics, describe exergy. Explain the different types of exergy b) What do you understand by the term reference environme c) Determine the specific exergy of saturated water vapour we having a velocity of 30m/s and an elevation of 6m, each relative to an exergy reference environment where T = 298K. P. = 1 atm and g = 9.8m/s. d) Steam enters a turbine with a pressure of 30 bar, a temperature of 400°C, a velocity of 160 m/s and exits as saturated vapor at 100°C with a velocity of 100 m/s. At steady state, the turbine develops work at a rate of 540 kJ per kg of steam flowing through the turbine. The heat transfer rate (cv/m = -22.6 – Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 350 K. Neglect the change in potential energy between the inlet and exit of the turbine, and assume that To = 25°C. Po =1 atm. Using a neat sketch, determine: i net exergy carried…arrow_forwardSupport your selected answer with the mass, energy, entropy or exergy equations, the ideal gas equation or other equations used in class. a) Two identical boilers are operating side by side, producing the same amount of heat. One boiler produces a flame temperature equal to 2000K while the other produces a flame temp equal to 700K. Which boiler has the potential to produce more useful work? a. Boiler with 2000K flame temp b. Boiler with 700K flame temp c. It is the same since both boilers are identical and have same heat output d. Need more information to determine b) A rigid tank contains 4 mol CO₂ and 1 mol N₂ at a total pressure of 2atm. N₂ is removed completely through a membrane that allows only N₂ to permeate. What happens to the partial pressure of CO₂ if all CO₂ remains in the tank? Assume ideal gases and an isothermal process. membrane a. CO2 pressure decreases b. CO₂ pressure increases c. CO₂ pressure stays the same d. need more information to determine CO₂ + N₂arrow_forward
- FAST ANSWERS WILL BE GIVEN UPVOTE.arrow_forwardAs a patent attorney you are asked to verify if a certain patent application should be approved, which means whatever is being patented must be possible/practical to build and work. The patent presents a new power plant designed to use a fuel capable of achieving a maximum temperature of 550 degrees F. The fluid flowing in the power plant system is to be cooled by a lake with temperature equal to 85 degrees F. The patent application indicates the power plant to be capable of achieving 0.78 thermal efficiency. Should this patent application be approved based on the information available? Why?arrow_forwarddescribe how the Internal Combustion Engines (ICEs) (applicable to a particular purpose such as generators, vehicle, domestic device etc.) was improved in terms of sustainability in consideration to energy use and pollution effects. 1.Conclusions: Findings based on your current knowledge of thermodynamics should be expressed. Suggestion and implication on possible saving or future projection(s)arrow_forward
- 3.1 For discussion: (a) Is it possible for exergy to be negative? Discuss. (b) Consider an evacuated space with volume V as the system. Eval- uate its exergy and discuss. PH associated with (c) Is it possible for the specific physical exergy e' a stream of matter to be negative? Discuss.arrow_forward(a)Based on the schematic shown in the diagram, list five examples of irreversibility that are evident in the system. For each irreversibility, state the device where the irreversibility occurs, and the evidence for the existence of the irreversibility. (b)Would adding a regenerator to this system improve performance? Why or why not?arrow_forwardSubmit correct and complete solutions. give propriate Explanation. Provide step-by-step detailed explanations.arrow_forward
- please answer the step 8arrow_forwardprovide a new, possible, and feasible study that deals with ways to reduce carbon emissions from coal power plants.arrow_forward10. Carnot cycle thermal efficiency is increased by reducing lower(sink) temperature 11. A system with higher exergy has more capacity to do work than a system with lower exergy. 12. A diffuser has low pressure at inlet and high pressure at outlet 13. Carnot efficiency equation can also be used to find efficiency of conversion of electrical and/or magnetic energy to work. 14. Quality factor of 0.75 indicates supersaturated vapor 15. Law of conservation of Mass and energy applied to Nozzles and Diffusers indicates that under ideal conditions, the change in kinetic energy of the fluid results in a complimentary change in enthalpy of the fluidarrow_forward
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