Chapter 5, Problem 5.15P

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7. A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a hot reservoir at TH = 1600 K and rejects energy QC by heat transfer to a cold reservoir at TC = 400 K. For each of the following cases determine whether the cycle operates reversibly, operates irreversibly, or is impossible. a. QH = 1000 kJ, ŋ = 75% b. QH = 1100 kJ, Wcycle = 800 kJ c. QH = 900 kJ, QC = 300 kJ

A power cycle operating at steady state receives energy by heat transfer at a rate QH at TH = 1800 K and rejects energy by heat transfer to a cold reservoir at a rate Qc at Tc = 600 K. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) Qu (300) kW, Oc = (100) kW (b) QH (500)kW, Wcycle = (150)kW, Oc = (200)kW (c) Wcycle (450)kW, Oc = (150)kW (d) QH = (500)kW, Oc = (100)kW

Thermodynamics 1

Thermodynamics I

Thermodynamics question

A power cycle operating between two reservoirs receives energy Qu by heat transfer from a hot reservoir at TH = 2000 K and rejects energy Qc by heat transfer to a cold reservoir at Tc = 400 K. For the cases below you will be asked to determine the cycle n and whether the cycle operates Reversibly, Irreversibility, or is Impossible. Сycle Сycle Сycle Assume: п — пСarnot n пСarnot 1. The maximum thermal efficiency nCarnot for the cycle is equal to а. 0.2 b. 0.8 с. 1.0 d. none of the above. 2. If QH = 1100 kJ and the Weycle = 900 kJ then the cycle is Reversible b. Irreversible c. Impossible а. d. none of the above. 3. If QH = 1000 kJ and Qc = 200 kJ then the cycle is a. Reversible b. Irreversible c. Impossible d. none of the above. 4. If Wq a. Reversible b. Irreversible c. Impossible d. none of the above. суcle 1400 kJ and Qc= 600 kJ then the cycle is 5. If n = 50% then the cycle is a. Reversible b. Irreversible c. Impossible d. none of the above.

The Stirling cycle (the cycle undergone by the gas inside the Stirling engine shown in the video in class)consists of the following processes:• A → B: Isochoric heating from a temperature TA to a temperature TB > TA.• B → C: Isothermal expansion from volume VA to a volume VC > VA.• C → D: Isochoric cooling from TC = TB to TD = TA.• D → A: Isothermal compression back to volume VA.Assume the gas can be treated as a monoatomic ideal gas and that there are n moles of gas in the engine. (a) Draw this cycle in a PV diagram.(b) Find the work done on the system and the energy transferred by heat to the system if TB = 2TAand VC = 3VB for each of the processes in this cycle. Write your answers in terms on n, R (thegas constant), TA, VA, or a subset of these quantities.(c) The efficiency of an engine is defined by η =WS/Qin, where WS is the net work done by the systemin the cycle, and Qin is the net amount of energy going into the system (not counting the energy leaving the system by means…

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