A gas undergoes a thermodynamic cycle consisting of three processes:
Compression occurs in Process 1-2 with pV= constant. P₁=10⁵ Pa, V₁=1.5 m³, and V₂=0.4 m³. U₂-U₁=0
Process 2-3 is isobaric.
Process 3-1 is isochoric. U₃-U1=-3259 kJ
a. Sketch the cycle on a p-V diagram.
b. Calculate the heat transfer for Process 3-1.
c. Calculate the work for process 2-3.
Unit kg of steam is heated reversibly at constant pressure of 2.5MPa, a temperature of Y 0C and dryness friction 0.80. Calculate the change in entropy (S) of the system.
Y=[250+(191/100)]=269.
A gas undergoes a thermodynamic cycle consisting of three processes:
A gas undergoes a cycle in a piston-cylinder assembly consisting of the following three processes:Process 1-2: Constant pressure, p=1.4 bar, v₁=0.028 m³, w12=10 kJProcess 2-3: Compression with p V= constant, U₃=U₂Process 3-1: Constant volume, U₁-U₃=-25 kJThere are no significant changes in kinetic or potential energy.(a) Calculate the net work for the cycle, in kJ.(b) Calculate the heat transfer for process 1-2, in kJ.
A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Constant volume V1 = 2 m3, p1 = 1 bar, to p2 = 3 bar, U2 – U1 = 400 kJ. Process 2-3: Constant pressure compression to V3 = 1 m3. Process 3-1: Adiabatic expansion, with W31 = 150 kJ. There are no significant changes in kinetic or potential energy. Determine the net work for the cycle, in kJ, and the heat transfers for...
A system consisting of 1.0 kg of water and undergoes a thermodynamic power cycle composed of the following four processes: Process 1 – 2: Constant pressure heating at 1 MPa from saturated vapor Process 2 – 3: Constant volume cooling to pz = 500 kPa, Tz = 160°C Process 3 – 4: Isothermal compression with Q34 = -815.8 kJ Process 4-1: Constant volume heating (a) Sketch the cycle on T - v and p - v diagrams. (b) Is this...
A piston-cylinder assembly undergoes a cycle consisting of the following three processes: • Process 1-2: Compression with constant internal energy • Process 2-3: Constant-volume cooling to p3 = 100 kPa, V3 = 0.1 m3 • Process 3-1: Constant-pressure expansion with W31 = 12 kJ Sketch the cycle on a p-V diagram, labeling each of the states and indicating the process directions with arrows. If the work for the entire cycle is Wcycle = -20 kJ and changes in kinetic and potential energy are negligible,...
Air in a piston-cylinder undergoes a cycle with the following processes: Process 1-2: Isobaric process from P = 0.1 MPa, T1 = 600K to T2 = 1200K Process 2-3: Isothermal process to state 3 where P3 = 0.05 MPa Process 3-4: Isochoric process to state 4 where P4 = 0.031 MPa Process 4-1: Polytropic process back to state 1 (a) Show the processes in a P-V plot showing the values. Also calculate or state the values of P. V. T...
One pound of oxygen O2 undergoes a power cycle consisting of the following processes: 3.145 One lb of oxygen, 02, undergoes a power cycle consisting of the following processes: Process 1-2: Constant-volume heating from P1 = 20 lbf/in. 7, = 500°R to T2 = 820°R. Process 2-3: Adiabatic expansion to = 1.432 Process 3-1: Constant-pressure compression to state 1. Sketch the cycle on a p-v diagram. Assuming ideal gas behavior, determine (a) the pressure at state 2, in lbf/in.2 (b)...
100 lb of R22 are in a thermodynamic cycle, consisting of the following process Process 1-2: isobaric compression from P1=340 psia y T1=215 °F until saturated vapor Process 2-3: constant volume cooling until T3= 120 °F Process 3-4: isobaric expansion Process 4-1: isochoric heating Complete the tables and write if it's a power cycle or a refirgeration cycle State P (psia) T(°F) V(ft3/lb) U(Btu/lb) 1 340 215 2 3 120 4 Process Q(Btu) W(Btu) ΔU(Btu) 1-2 2-3 3-4 4-1 Total
A piston-cylinder assembly contains air modeled as an ideal gas. The air undergoes a power cycle consisting of four processes in series: • Process 1-2: Constant-temperature expansion at 600 K from p1 = 0.5 MPa to p2 = 0.4 MPa. • Process 2-3: Polytropic expansion with n = 1.3 to p3 = 0.3 MPa. • Process 3-4: Constant-pressure compression to ν4 = ν1. • Process 4-1: Constant-volume heating. a) Sketch the cycle on a p-ν diagram. b) Calculate the work...
Problem 7 A system undergoes a thermodynamic cycle consisting of four processes in series. The table below provides some data, where the familiar sign convention for first-law analysis is adopted. The system is a closed system. Kinetic energy and potential energy effects can be neglected. a. Using first-law analysis and the energy balance for a cycle, find the missing values in the table. b. Determine whether the cycle is a power cycle or refrigeration cycle. c.Show that the net amount...