An insulated piston-cylinder device contains 4.5 m3 of water with a quality equal to 0.5 at a constant pressure of 300 kPa. Water is stirred by a paddle wheel while electrical current flows through a resistor placed in the water. During this constant-pressure process, the paddle wheel work amounted to 1000 kJ and electrical work from the resistor amounted to 19000 kJ. What is the temperature of the water in its final state? Show the process on a P-v diagram with respect to saturation lines.

An insulated piston-cylinder device contains 4.5 m3 of water with a quality equal to 0.5 at a constant pressure of 300 kPa. Water is stirred by a paddle wheel while electrical current flows through a resistor placed in the water. During this constant-pressure process, the paddle wheel work amounted to 1000 kJ and electrical work from the resistor amounted to 19000 kJ. What is the temperature of the water in its final state? Show the process on a P-v diagram with respect to saturation lines.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 17RQ: At a constant pressure, how does a volume of gas vary with respect to the absolute temperature?

See similar textbooks

Similar questions

A piston-cylinder assembly contains air at 210 kPa and occupies a volume of 0.01m'. The piston is attached to one end ofa spring and the other end of the spring is fixed to a wall. The force exerted by the spring on the piston is proportional to the decrease in the length of the spring. The ambient atmospheric pressure is 100 kPa. Now, the air in the cylinder is heated till the volume is doubled and at this instant it is found that the pressure of the air in the cylinder is 600 kPa. Sketch the process on p-v diagram and calculate work done by the gas. Q2:
A piston-cylinder assembly contains air at 210 kPa and occupies a volume of 0.01m'. The piston is attached to one end of a spring and the other end of the spring is fixed to a wall. The force exerted by the spring on the piston is proportional to the decrease in the length of the spring. The ambient atmospheric pressure is 100 kPa. Now, the air in the cylinder is heated till the volume is doubled and at this instant it is found that the pressure of the air in the cylinder is 600 kPa. Sketch the process on p-v diagram and calculate work done by the gas.
A piston-cylinder assembly with a total volume of 0.1546m3contains 1 kg of water at 350°C.The apparatus was cooled to a temperature of 100 °C.Calculate the final pressure of the water in kPa and its volume in m3.
An airtight dispenser for drinking water is 25 cm × 10 cm in horizontal dimensions and 20 cm tall. It has a tap of negligible volume that opens at the level of the bottom of the dispenser. Initially, it contains water to alevel 3.0 cm from the top and air at the ambient pressure, 1.00 atm, from there to the top. When the tap is opened, water will flow out until the gauge pressure at the bottom of the dispenser, and thus at the opening of the tap, is 0. What volume of water flows out? Assume the temperature is constant, the dispenser is perfectly rigid, and the water has a constant density of 1000 kg/m3
Question 1 A piston-cylinder assembly with a frictionless piston has a volume of 0.1 m' and initially filled with steam of 0.5 kg at a pressure of 0.4 MPa. There is heat transfer until the temperature reaches 573 K. Find the total heat transfer as well as the work done during the process. Sketch the process on a P-v diagram with respect to the vapour dome.
A 3-m3 rigid tank contains hydrogen at 250 kPa and 550 K. The gas is now cooled until its temperature drops to 340 K. Determine; (a) the final pressure in the tank (b) find the mass of hydrogen in the tank (kg)
Show solution: Argon in the amount of 1.5 kg fills a 0.04-m3 piston-cylinder device at 550 kPa. The piston is now moved by changing the weights until the volume is twice its original size. During this process, argon’s temperature is maintained constant. Determine the final pressure in the device. Answer is 275kPa.
Steam at a pressure of 3.5 mPa is known to have a specific volume of .05 m3/kg. Determine the quality
Let's consider a closed container. This has a glass sight that allows you to observe the liquid level. The container contains refrigerant 134a at 20 ° C. A dough extraction is carried out from the bottom at a very low rate, the temperature remains constant throughout the process. If the area of the container is 0.05m ^ 2 and after liquid extraction the level drops150 mm, determine the mass of refrigerant that came out. see img
In a piston cylinder assembly, air is compressed slowly from an initial state of 1.3 bars and 500 cc to a state where the volume is 90 cc. If the process is isothermal, determine the final pressure in kPa. 722 а. с. 895 b. 814 d. 1210
The temperature of an ideal gas remains constant at 320 K while the gage pressure changes from 0.325 KPag to 723.675 KPag amd the initial volume is 0.10 m3. What is the final volume of the gas?
A piston-cylinder arrangement contains water at 112°C, 84% quality with a volume of 0.98 L. What is the initial mass, in grams? The system is then heated, causing the 150-mm-diameter piston to rise and encounter a linear spring with k = 800 kN/m. Calculate the specific internal energy (kJ/kg) at this instant knowing that the measured volume is 1.65 L. The heating continues and compresses the spring in the process. When the piston encounters the stops, the pressure is 200 kPa. What is the temperature (in °C) and entropy (in J/K) at this point? Heating then continues until the pressure reaches 300 kPa. What is the volume, in L, at this instant? Illustrate the complete process in separate P-v and T-v diagrams.