Chapter 5, Problem 5.10CU

The following processes occur in a reversible thermodynamic cycle:   1-2: 0.2 kg heating at constant pressure 1.05 bar at specific volume 0.1 m3/kg and work done -515 J. 2-3: Isothermal compression to 4.2 bar. 3-4: Expansion according to law pv1.7= constant. 4-1: heating at constant volume back to the initial conditions. Calculate the work done for the isothermal process in J.

The following processes occur in a reversible thermodynamic cycle:   1-2: 0.2 kg heating at constant pressure 1.05 bar at specific volume 0.1 m3/kg and work done -515 J. 2-3: Isothermal compression to 4.2 bar. 3-4: Expansion according to law pv1.7= constant. 4-1: heating at constant volume back to the initial conditions.   Calculate the work done for the constant volume heating process?

A piston-cylinder assembly contains 5 kg of air modeled as an ideal gas with a constant specific heat ratio, k = 1.4. R for air is 0.287 kJ/kg*K. The air undergoes a power cycle Process 1-2: Isothermal expansion at 600 K from Pi = 1 MPa to p2 = 0.7 MPa. consisting of four processes in series: Process 2-3: Polytropic expansion (n = k) to p3 = 0.5 MPa. Process 3-4: Constant pressure compression to V4 = V1. Process 4-1: Constant volume heating to pi = 1 MPa Part a.) Draw the p-v diagram and label all pressures and volumes with units. Part b.) Fill in as much of the charts below as you can. Process Q (net) kJ W (net) kJ AU KJ 1-2 2-3 3-4 4-1 Cycle (Total) State T (K) P (kPa) V(m³) Ulk)) 3 Part c.) Determine the thermal efficiency for the cycle.

Where can I apply solving matrices in thermodynamics?

The following processes occur in a reversible thermodynamic cycle:   1-2: 0.2 kg heating at constant pressure 1.05 bar at specific volume 0.1 m3/kg and work done -515 J. 2-3: Isothermal compression to 4.2 bar. 3-4: Expansion according to law pv1.7= constant. 4-1: heating at constant volume back to the initial conditions.   Calculate the net work done in joules?

The following processes occur in a reversible thermodynamic cycle: 1-2: 0.2 kg heating at constant pressure 1.05 bar at specific volume 0.1 m³/kg and work done -515 J. 2-3: Isothermal compression to 4.2 bar. 3-4: Expansion according to law pv1./= constant. 4-1: heating at constant volume back to the initial conditions. Calculate the work done for the expansion process in joules to 2 decimal places ?

The following processes occurs in a reversible thermodynamic cycle: 12 Reversible polytropic compression at pressure 0.8 bar at volume 0.1 m to a pressure 11 bar and specific volume 0 6 kg The index of compression may be taken as n. 23 Reversiby expansion with expansion index of 2 to pressure 1.2 bar. BA Reversible cooling at constant volume to the initial state. Calculate the Work for the expansion in the process to 2 decimal places. Not in kilo or mega of unit

3. Air is contained within a piston-cylinder assembly The cross sectional area of the piston is 0.01 m². Initially the piston is at 1 bar and 25°C, 10 cm above the base of the cylinder. In this state, the spring exerts no force on the piston. The system is then reversibly heated to 100°C. As the spring is compressed, it exerts a force on the piston according to: F=-kx where k= 50,000 N/m and x is the displacement length from its uncompressed position. Determine the work done. a. -166 J b. -216 J c. 166 J d. 216 J

A piston-cylinder device contains 2 kg of water which is initially a saturated liquid at 300 ∘ C. It undergoes three processes to form a cycle. The first process is constant volume, the second is constant pressure at 2 bar and the third is a polytropic process where Pv 1.1 = constant. If you can calculate the heat transfer and work (both in kJ ) for each process. Is the device a heat engine or a refrigerator? Answer Table Description Work transfer for first process (kJ) Heat transfer for first process (kJ) Work transfer for second process (kJ) Heat transfer for second process (kJ) Work transfer for third process (kJ) Heat transfer for third process (kJ) Heat engine (1) or refrigerator (2) Value Value Thank you