Problem #1: A power cycle operates between hot and cold reservoirs at 1000 K and

Question

Problem #1: A power cycle operates between hot and cold reservoirs at 1000 K and 300 K, respectively. For each claimed set of data listed below, determine whether the cycle operates reversibly,operates irreversibly, or is impossible. You must show work to support your answer.

(a) QH = 600 kJ; Wout= 300 kJ; QL = 300 kJ

(b) QH= 400 kJ; Wout = 280 kJ; QL = 120 kJ

(c) QH= 700 kJ; Wout = 300 kJ; QL = 500 kJ

(d) QH= 800 kJ; Wout = 600 kJ; QL = 200 k

Problem #2: As shown in the diagram, a system undergoing a power cycle delivers a net power output of
1 MW while receiving energy by heat transfer from steam condensing from saturated vapor to saturated liquid at a constant pressure of 100 kPa. Energy is discharged from the cycle by heat transfer to a nearby lake at 17

Problem #1: A power cycle operates between hot and cold reservoirs at 1000 K and 300 K, respectively. For each claimed set of data listed below, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. You must show work to support your answer. (a) QH = 600 kJ; Wout= 300 kJ; QL = 300 kJ (b) QH= 400 kJ; Wout = 280 kJ; QL = 120 kJ (c) QH= 700 kJ; Wout = 300 kJ; QL = 500 kJ (d) QH= 800 kJ; Wout = 600 kJ; QL = 200 k Problem #2: As shown in the diagram, a system undergoing a power cycle delivers a net power output of 1 MW while receiving energy by heat transfer from steam condensing from saturated vapor to saturated liquid at a constant pressure of 100 kPa. Energy is discharged from the cycle by heat transfer to a nearby lake at 17 degreeC. These are the only significant heat transfer processes that need to be considered. Ignoring effects of kinetic and potential energy, and assuming steady operation, determine the minimum and maximum theoretical mass flow rate (kg/s) of steam required for this scenario.

Explanation / Answer

1)

Max. Effiiency = 1

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