Water is heated in a closed container with rigid walls that is a perfect cube (1 m x 1 m x 1m). The initial volume of the water (liquid + vapor) is 1 m'. The initial temperature ofthe water is 100 °C and it has a quality of 0.3. It is heated until it reaches a final pressureof 700 kPa.a. Sketch the process on the P V diagram.b. What is the work done by the water during this heating process in kJ?c. What is the final temperature of the water?d. What is the heat required in order for this process to occur in kJ?PV

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Answered: Water is heated in a closed container…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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answer a and b
EXAMPLE 2 0.25 g of gas occupying 0,7 m' had on original temperature of 15 °F. It was then heated at constant volume until its temperature become 135 °C. How much heat was transferred to the gas and what was its final pressure? Take Cv = 0.72 kJ/ kg.K and R = 0.29 kJ/ kg.K
Solve these two maths showing the processes too in a well defined way.
In a piston-cylinder assembly, there is initially 2 kg of water at a temperature of 25 °C and a pressure of 100 kPa. Then heat is given to the water until its volume is 0.4 m3. At this point, the piston in the cylinder is fixed with a stopper, but the water in the cylinder continues to heat until its temperature reaches 300 oC. According to this, calculate a) the final pressure of the water, b) the amount of heat given to the water, c) the work done by the piston. d) Show these processes in the T-v (Temperature-Specific Volume) diagram
By choosing one of the 3 options given below, the water in the closed container in Find the temperature and show the process on T-v, P-v diagrams. 1. 2. 3. Seçenek Seçenek Seçenek V n (devir/dakika) su 700 800 900 mil Tork (N.m) 150 200 250 Pi, T1, V1 t (dakika) 20 15 10 V (volt) 140 130 120 I (amper) 10 15 20 P. (kPa) 800 600 400 TI 150 130 120 VI (litre) 10 15 20 Q: (kJ) 400 500 600
wer.. 2. Ammonia weighing 22 kgs is confirmed inside a cylinder equipped with a piston has an initial pressure of 413 KPa at 38C. If 2900 KJ of heat is added to the ammonia until its final pressure and temperature are 413 KPa and 100C, respectively, what is the amount of work done by the fluid in KJ?
(b) A frictionless piston-cylinder device as shown in Fig. Qlb contains water at 300 kPa and the water is heated at constant pressure from saturated liquid to saturated vapor. Then, the heating process is continued in an isobaric manner until its specific volume reaches the value of 0.7 m'/kg. Water Heat Figure Qlb i) What is the initial temperature of water in the cylinder? ii) What is the final temperature of water in the cylinder? iii) Calculate the total boundary work during the processes, kJ/kg. iv) Calculate the total amount of heat transferred during the processes, kJ/kg. v) Sketch both processes on a T – v diagram with respect to saturation lines.
2. Saturated liquid water at 250 kPa is contained in a piston-cylinder device as shown in the figure below. The total initial volume is 0.012m'. As the water is heated, the pressure inside the cylinder remains constant until the piston hits the stops. When the piston hits the stops the specific volume is 0.47443 m/kg. Heat transfer to the water continues until the pressure doubles. NOTE: If needed use the closest value in tables 3 to avoid interpolation. Use 5 decimal digits when using specific volume. a.) Plot the process in a P-v-diagram with respect to saturations lines. b.) Fill de table below c.) Determine the total mass P(kPa) T(°C) v(m'/kg) h(kJ/kg) Phase 2 3.
answer d
A frictionless piston-cylinder device encloses 0.226 kg of saturated water-vapour mixture which is initially 10% by mass in liquid. The initial pressure is 1.035 MPa. The fluid is now heated until it all becomes saturated vapour. a. Find the work done during the process. Now, suppose that there is a stop in the cylinder that limits the piston to stop at the top when the volume is 0.0424 m'. b. Find the quality of the mixture when the piston just reached the stop, i.e. when the fluid volume is at 0.0424 m³.
Q2. A mass of 1000kg of saturated liquid water is completely vaporized in a isobaric (100kPa) heat addition process. o Find the volume change between states o The amount of energy required to perform this process.
A Piston-Cylinder arrangement initially contains 3 kg of water as saturated liquid at 200 kPa pressure. Then, heat transfer to water, some of the water evaporates and the piston rises. When the volume is 60 liters, the piston touches the stoppers. Heating process continues until the pressure is twice the initial pressure. Plot the state change on the P-v diagram showing the saturation curves. Also, A) Finally, find the mass of the system in liquid phase. B) Find the final temperature. C) Calculate the total work done and heat transfer during the process.

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