Q3. 5 kg of water at T = 20° C and P = 7 bar is...

Q3. 5 kg of water at T = 20° C and P = 7 bar is isobarically heated such that ΔU = 5000 kJ. (i) Find the initial and final volumes (in m3 ). (ii) Find Q and W (in kJ). (iii) Show the initial and final states on p-υ and T-υ diagrams (not to scale), denoting by arrows the direction of the process. Label the ‘f’ (saturated liquid) and ‘g’ (saturated vapor) points. Also, indicate the values of υf and υg on the x-axis of both the p-υ and T-υ diagrams.

Q4. Water inside a closed, rigid tank is cooled from its critical point to a final pressure of 10 MPa. (i) Sketch the process on p-υ and T-υ diagrams. Label the saturated liquid and saturated vapor states. (ii) Find the quality of the water after cooling. (iii) Calculate the heat transfer in kJ/kg.

Q5. Water of mass 1 kg contained in a piston-cylinder configuration is initially in a saturated liquid state (state A) at 10 bar. The water undergoes the following thermodynamic cycle: AB -> The water is heated isobarically until the water is in a saturated vapor state. BC -> The system is then cooled isochorically until the pressure is 1 bar. CD -> The system is further cooled isobarically until υD= υA. DA -> The system is finally heated isochorically back to state A. (i) Sketch this cycle on p-υ and T-υ diagrams (not to scale), using arrows to indicate the direction of each process. (ii) For each of the four states A to D, write down p, T and υ. (iii) For each of the four processes, evaluate the work and heat transfer (in kJ). (iv) What is the thermal efficiency of this power cycle?

Q6 (Bonus). Water of mass 2 kg in a closed, rigid tank is initially in the form of a twophase liquid-vapor mixture. The initial temperature is 50° C. The mixture is heated until the tank contains only saturated vapor at 110° C. (i) Find the initial pressure, in kPa. (ii) Find the work for the process, in kJ. (ii) Find the heat transfer for the process, in kJ.

Expert Solution

samet mamat answered 2 years ago

Thermodynamics - water P = 20 bar, T = 250 C, what is the specific volume?...

Thermodynamics - water P = 20 bar, T = 250 C, what is the specific volume? (choose the closest answer) a)0.1085 b)0.15 c)0.1200 d)0.1308 T = 240 C, P = 2.5 bar, what is the specific internal energy?. a)2713.1 b)2714 c)2717.2 d)2720 P = 20 bar, h = 2900 kJ/kg, what is the temperature? a)250 b)240 c)280 d)300

During isobaric process m=64 kg of wet water stream at temperature t=262.7?C and pressure p=49 bar...

During isobaric process m=64 kg of wet water stream at temperature t=262.7?C and pressure p=49 bar changed its specific volume from v1 =0.0018 m3/kg to v2=0.035 m3/kg. Find initial and final quality of steam, change of internal energy of steam, work done by steam, amount of heat exchanged with surroundings. Draw the process at the enthalpy-entropy diagram. From tables for p=49 bar: v’=0.0013 m3/kg, v”=0.0403 m3/kg, h’= 1148.4 KJ/kg, h”= 2794.7 KJ/kg

Five kg of water is contained in a piston–cylinder assembly, initially at 5 bar and 500°C....

Five kg of water is contained in a piston–cylinder assembly, initially at 5 bar and 500°C. The water is slowly heated at constant pressure to a final state. The heat transfer for the process is 2660 kJ and kinetic and potential energy effects are negligible. Determine the final volume, in m3, and the work for the process, in kJ. There is no final temperature information given.

4. [30 pts] 20 liters of water at 20 bar and 100 °C are in a...

4. [30 pts] 20 liters of water at 20 bar and 100 °C are in a variable volume container. 56,000 kJ of heat are added to the system at constant pressure which causes an increase in both temperature and volume. a. [4 pts] Draw a schematic of the process b. [4 pts] Write the energy balance for this process and clearly state any assumptions: c. [12 pts] What is the final volume of the container? d. [8 pts] How much...

20 liters of water at 20 bar and 100 °C are in a variable volume container....

20 liters of water at 20 bar and 100 °C are in a variable volume container. 56,000 kJ of heat are added to the system at constant pressure which causes an increase in both temperature and volume. Draw a schematic of the process Write the energy balance for this process and clearly state any assumptions: What is the final volume of the container? How much work in [kJ] is completed? Pay careful attention to your negative signs! In one sentence...

3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar...

3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar of pressure. It is slowly poured into a heavily insulated beaker containing 7.5 Kg of water at a temperature and pressure of 4 C, 1 bar, respectively. The specific heat of the water, an incompressible material is, c = 4.1 KJ/(Kg K). The beaker can be considered to be an adiabatic system. The two water mass’ reach an equilibrium temperature. There is no kinetic...

A cooler contains 1 kg of ice at -5°C. 2 kg of water at 50°C is...

A cooler contains 1 kg of ice at -5°C. 2 kg of water at 50°C is added to the cooler. If the cooler does not exchange any heat with the rest of the world, what is the final temperature of the ice and water?

One kg of water in a piston-cylinder assembly, initially at 1.5 bar and 200 C, cools...

One kg of water in a piston-cylinder assembly, initially at 1.5 bar and 200 C, cools at constant pressure with no internal irreversibilities to a final state where the water is a saturated liquid. For the water as the system, determine the work, the heat transfer, and the amounts of exergy transfer accompanying work and heat transfer, each in kJ. Let T0 = 20 °C, p0=1 bar and ignore the effects of motion and gravity. THERE ARE SOME DIFFERENT ANSWERS...

Two kg of water is contained in a piston–cylinder assembly, initially at 10 bar and 200°C....

Two kg of water is contained in a piston–cylinder assembly, initially at 10 bar and 200°C. The water is slowly heated at constant pressure to a final state. If the heat transfer for the process is 1740 kJ, determine the temperature at the final state, in °C, and the work, in kJ. Kinetic and potential energy effects are negligible. (Moran, 01/2018, p. P-23) Moran, M. J., Shapiro, H. N., Boettner, D. D., Bailey, M. B. (01/2018). Fundamentals of Engineering Thermodynamics,...

1.45 kg of ice at -5 ∘C is dropped into 31 kg of water at temperature 15.3 ∘C . Part...

1.45 kg of ice at -5 ∘C is dropped into 31 kg of water at temperature 15.3 ∘C . Part A - Final Temperature What is the final temperature of the system? (If I've set the problem up right, you should be given numbers such that all of the ice has melted.) Tf = ∘C Part B - Entropy of Warming Ice What is the change in entropy of the ice, as it warms up before melting? S = J/K Part C - Entropy...

Question