FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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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).
Which statement/s are true?
Heat is transferred to a system by either an air-sourced Carnot heat pump, an electrical resistance heater or a heat source at temperature marginally higher than the system temperature. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is minimum when heat is added by the air-sourced Carnot heat pump.
Heat is transferred to a system either by an 100% efficient electrical resistance heater, or an 100% efficient isothermal heat source. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is zero when heat is added by the isothermal heat source.
Heat is transferred to a system by either an air-sourced Carnot heat pump, an electrical resistance heater, or a heat source at temperature marginally higher than the system temperature. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is maximum when heat is added by the electric resistance heater.
Heat is transferred to a system by either a…
EXPLAIN THE THE DECREASE OF EXERGY PRINCIPLE AND EXERGY DESTRUCTION.
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- Give an example of Exergy Destroyed During Mixing of Fluid Streams.arrow_forwardHow can we achieve the desired air to fuel ration in engines?arrow_forwardis true for first law & second law efficiency (exergetic efficiency), respectively. + x Carnot efficiency and Carnot efficiency To Exergy used Exeryy supplied Desired output and Supplied Input Desired output Exergy lost and Supplied Input Exergy used Entropy generation Energy generationarrow_forward
- Determine the sum of the rate of exergy destruction, in Btu/h, in the turbine, process heat exchanger, trap, and pump. PLEASE ANSWER ASAP THANK Uarrow_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_forward13. Exergy can be created but cannot be destroyed. Т F 14. In gas power cycles, the working fluid changes its phase throughout the cycle. T F 15. The ideal Otto cycle consists of a constant volume heat addition process. T F 16. The exergy destroyed in an isentropic process is zero. T F 17. The working fluid remains in vapor status throughout a vapor power cycle. T F 18. Exergy and energy can neither be created nor destroyed. T Farrow_forward
- Which of the following statements best describes the 2nd law of thermodynamics? The total entropy of a a reservoir must stay the same or increase. The change in internal energy for an ideal gas is given as A U=mc _▲T. V Heat energy will always be transferred from a hotter object to a colder object. Around a complete cycle, the net heat and net work additions must sum to zero. O A reversible cyclic engine can convert all the heat input it receives into useful work output.arrow_forwardApply exergy analysis and calculate the exergy of three pressurised tanks (units: MJ) at the fully charged state. Where relevant, assume constant specific heats for airarrow_forwardTrue false want to make sure I have the right answers for studyarrow_forward
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