Solution Found!
A system consisting of 1 kg of H2O undergoes a power cycle
Chapter 3, Problem 3.78(choose chapter or problem)
A system consisting of 1 kg of \(\mathrm{H}_{2} \mathrm{O}\) undergoes a power cycle composed of the following processes:
Process 1–2: Constant-volume heating from \(p_{1}=5 \text { bar, } T_{1}=160^{\circ} \mathrm{C} \text { to } p_{2}=10 \mathrm{bar}\).
Process 2–3: Constant-pressure cooling to saturated vapor.
Process 3–4: Constant-volume cooling to \(T_{4}=160^{\circ} \mathrm{C}\).
Process 4–1: Isothermal expansion with \(Q_{41}=815.8 \mathrm{~kJ}\).
Sketch the cycle on T–v and p–v diagrams. Neglecting kinetic and potential energy effects, determine the thermal efficiency.
Questions & Answers
QUESTION:
A system consisting of 1 kg of \(\mathrm{H}_{2} \mathrm{O}\) undergoes a power cycle composed of the following processes:
Process 1–2: Constant-volume heating from \(p_{1}=5 \text { bar, } T_{1}=160^{\circ} \mathrm{C} \text { to } p_{2}=10 \mathrm{bar}\).
Process 2–3: Constant-pressure cooling to saturated vapor.
Process 3–4: Constant-volume cooling to \(T_{4}=160^{\circ} \mathrm{C}\).
Process 4–1: Isothermal expansion with \(Q_{41}=815.8 \mathrm{~kJ}\).
Sketch the cycle on T–v and p–v diagrams. Neglecting kinetic and potential energy effects, determine the thermal efficiency.
ANSWER:Problem 3.78
A system consisting of 1 kg of H2O undergoes a power cycle composed of the following processes: Process 1-2: Constant-volume heating from p = 5 bar, T1 = 160 to = 10 bar. Process 2-3: Constant-pressure cooling to saturated vapor. Process 3-4: Constant-volume cooling to T4 = 160. Process 4-1: Isothermal expansion with = 815.8 kJ. Sketch the cycle on T and p diagrams. Neglecting kinetic and potential energy effects, determine the thermal efficiency.
Step by Step Solution
Step 1 of 2
Using the given descriptions and data we can sketch the cycle. For process 1-2 we have a constant volume heating from and to . Process 2-3 is a constant pressure cooling to saturated vapour phase. Process 3-4 is a constant volume cooling to and finally, process 4-1 is isothermal expansion back to the initial position.