FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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a cylinder and piston arrangement contains 2 kg of R-134a at 150 kPa, 60 C. The piston is now moved slowly, compressing the refrigerant until it exists as saturated vapor. During this process, the necessary heat transfer takes place (do you agree that heat transfer ocurs, and if so explain) such that the temperature of the refrigerant remains constant. (a) Show the process on P-v, T-v, and T-s diagrams. Explain your diagrams. (b) Determine the final pressure and specific volume of the R-134a (c) Calculate the work done and the heat transfer for the process.
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- Two kilograms of ice at -24C is heated in an open pan until melts and then evaporates. The saturate vapor exits the system at 100C. How much heat must be added to the system for this to occur?arrow_forwardFor the situations below briefly explain how you obtained the values and provide the numerical answer. A) When 1 kg saturated water vapor is condensed to a saturated liquid water at 325 Kpa, what is the change in its volume? B) What is the specific internal energy liquid water at 280 degree Celsius and 7500 Kpa?arrow_forwardA piston-cylinder assembly contains 0.1 kg of air at 300 kPa pressure and 270C temperature. First at constant pressureBy adding heat, the volume is doubled from the initial volume. Then at constant temperature air is expanded up to 100 kPa pressure. According to this; 1-Show the whole event in the P-V diagram. 2-Status find work and heat shifts in changes.arrow_forward
- In a closed system, some water is heated to 50 oC. Then it is taken the air by vacuum in the system. What kind of observation would be expected regarding water in the closed system?arrow_forwardThe molar specific heat at constant volume of an ideal gas is equal to 2.5times the universal gas constant (8.314J/mol-K). When the temperature increases by 150K. Find the change in molar specific enthalpy.arrow_forwardH.W: - 0.8m of gas at 8bar and 27°C is compressed isothermally until its volume is ¼ time the original volume, then its heated at constant pressure to original volume, finally its cooled at constant volume to original condition. Find: - a- the heat transferred. b- Work done c- Change in internal energy. (draw the processes on p-v diagram) Take cp=1.01kj/kg.k, R=0.28kj/kg.karrow_forward
- Need help solving this problem. Please provide clear steps and explanations.arrow_forwardPlease state the assumptions and tables.arrow_forwardWater is heated in a closed container with rigid walls that is a perfect cube (1 m x 1 m x 1 m). The initial volume of the water (liquid + vapor) is 1 m'. The initial temperature of the water is 100 °C and it has a quality of 0.3. It is heated until it reaches a final pressure of 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? P Varrow_forward
- Find the volume, the internal energy and the enthalpy of 2.5 kg of compressed liquid at 7.5 MPa and 215 C if the substance is water.arrow_forwardB9arrow_forwardQ-2) As shown in the figure below, a system of piston and cylinder configuration has a linear spring that is open to the atmosphere. The space between the bottom of cylinder and the piston was filed with 0.075 m3 of water at 2 MPa, 350 °C. When the piston is at the bottom, the spring exerts a force such that a pressure of 120 kPa inside is required to balance the forces. The system now cools until the pressure drops to 1.5 MPa. Find the heat rejected during the process. 国 Waterarrow_forward
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