FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Define the exergy destruction, which is the wasted work potential during a process as a result of irreversibilities.
When T > T0, the exergy and heat transfer are in the same direction.
1. A source of heat at 1000 K transfers 1000 kW of power to a power generation device, while
producing 300 kW of useful work. Determine:
a. The rate of exergy destruction in this process if the environment is at 300K.
b. The second law efficiency of the system.
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- EXPLAIN THE THE DECREASE OF EXERGY PRINCIPLE AND EXERGY DESTRUCTION.arrow_forwardThe exergy transfer to a steady-flow system is equal to the exergy transfer from it plus the exergy destruction within the system.arrow_forwardA system undergoes a refrigeration cycle while receiving Qc by heat transfer at temperature Tc and discharging energy Qu by heat transfer at a higher temperature TH. There are no other heat transfers. (a) Using energy and exergy balances, show that the net work input to the cycle cannot be zero. (b) Show that the coefficient of performance of the cycle can be expressed as: Tc TH – TeA'¯ T(Qn – Q). B = where E, is the exergy destruction and To is the temperature of the exergy reference environment. (c) Using the result of part (b), obtain an expression for the maximum theoretical value for the coefficient of performance.arrow_forward
- Exergy flow associated with a fluid stream when the fluid properties are variable can be determined by.arrow_forwardSteady-state operating data are shown in the figure below for an open feedwater heater. Heat transfer from the feedwater heater to its surroundings occurs at an average outer surface temperature of 50°C at a rate of 100 kW. Ignore the effects of motion and gravity and let To = 25°C, po = 1 bar. Determine (a) the ratio of the incoming mass flow rates, m/ṁ2. (b) the rate of exergy destruction, in kW. P2 = 1 bar Tz = 400°C 1 ṁy = 0.7 kg/s Pi = 1 bar T, = 40°C Feedwater heater X3 = 25% P3 = 1 bar Tp = 50°C %3D 2)arrow_forwardApply exergy balance to closed systems and control volumes.arrow_forward
- Define exergy, which is the maximum useful work that could be obtained from the system at a given state in a specified environment.arrow_forwardStarting with energy and entropy balances, derive the general exergy balance relation for a closed system.arrow_forwardCorrect answer will be upvoted.THANK YOU!!!arrow_forward
- i need the answer quicklyarrow_forward3.1 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_forwardDetermine the change in exergy in kJ for each of the following processes in the system with 1 kg of steam at 20 bar and 240 °C initially. a) In case the system is heated to double its volume at constant pressure. b) In case of expansion by doubling the system volume isothermally. dead state; T0=20 °C, P0=1 bararrow_forward
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