shown in Figure, a system undergoing a power cycle developed a net power output of Wcycle= 585.15 kW while receiving energy by heat transfer from steam condensing from saturated vapor (state1) to saturated liquid (state2) at a pressure of 2.5 bar. Energy is discharged from the cycle by heat transfer to a nearby lake at Tc. There are the only significant heat transfer. Kinetic and potential energy effects can be ignored.
- As shown in Figure, a system undergoing a power cycle developed a net power output of Wcycle= 585.15 kW while receiving energy by heat transfer from steam condensing from saturated vapor (state1) to saturated liquid (state2) at a pressure of 2.5 bar. Energy is discharged from the cycle by heat transfer to a nearby lake at Tc. There are the only significant heat transfer. Kinetic and potential energy effects can be ignored.
(a) write the energy balance equation to calculate the QH from the steam condensing part
(b) Locate the states (state 1&2: saturated vapor and saturated liquid at 2.5 bar) on the T-v coordinate and process
(c) When the steam mass flow rate is in 1 kg/s, calculate the heat transfer Qh from steam condensing from saturated vapor to saturated liquid at a pressure of 2.5 bar, in kW (steady-state).
(d) Calculate the actual thermal efficiency of the power cycle
(e) When Tc is 20C, Calculate the maximum theoretical thermal efficiency of the power cycle
(f) Compare (d) and (e) to determine whether the cycle operates reversibly, operates irreversibly or impossible
- g) When Tc is 60C, Calculate the maximum theoretical thermal efficiency of the power cycle
(h) Compare (d) and (g) to determine whether the cycle operates reversibly, operates irreversibly or impossible
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