Consider 0.5 kg of Refrigerant -134a contained in a piston-cylinder assembly with initial temperature of 80°C and pressure 7 bar. An adiabatic expansion brings the system to 48°C and 2 bar. A subsequent isobaric compression reduces the volume of the system to half of its initial volume. a) Create a p-v diagram (with dome shape included) and indicate the location of different states and processes. The diagram does not need to be on scale.

Consider 0.5 kg of Refrigerant -134a contained in a piston-cylinder assembly with initial temperature of 80°C and pressure 7 bar. An adiabatic expansion brings the system to 48°C and 2 bar. A subsequent isobaric compression reduces the volume of the system to half of its initial volume. a) Create a p-v diagram (with dome shape included) and indicate the location of different states and processes. The diagram does not need to be on scale.

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

See similar textbooks

Similar questions

A cylinder-piston assembly initially contains water at 3 MPa and 300°C. The water is cooled at constant volume to 200 °C, and then compressed isothermally to a final pressure of 2.5 MPa. Sketch the process on a T-v diagram and find the specific volume at the 3 states. [Ans. 0.081l m kg. 0.0811, 1.155x10 m kg]
On a T-V diagram sketch the constant specific volume through the reference state (state 0) T = 250C, v = 1.1989 m^3/kg from T1 = 350C to T2 = 120C. Sketch the constant pressure curves through the states so that they extend form the compressed liquid region to the superheated region. Places states on diagram along with their temperatures, pressures, and specific volumes on the diagram axes. The fluid is water.
2-kg saturated liquid Refrigerant-134a at 0. 40 MPa undergoes the following:Process 1-2: Evaporation at constant pressure until its temperature is 30 °C.Process 2-3: Cooled down at constant volume until it starts to condensate.a. Sketch the P-v and T-v diagram for the processes. Clearly show all states on the diagram. b. Estimate (no need for interpolation) the initial and final temperature of the refrigerant c. Determine the amount of heat transfer involved for each process and statewhether it is rejected or absorbed by the system. (Perform interpolation where necessary).
A piston-cylinder device contains an ideal gas of nitrogen. At the initial state, the volume is V₁ = 1.00 m³, the pressure is p₁= 400.00 kPa, the temperature is T₁=300.00 K. An electric heater within the device is turned on for a time of At = 5.00 min. The current is I = 3.00 A, and the source voltage is V = 120.00 V. During the heating process, the gas expands, and a heat loss of Qout = 2.80 kJ occurs. The gas constant is R = 0.297 kPa m³/(kg-K), and the room temperature specific heat at constant pressure is cp =1.039 kJ/(kg-K). Calculate the final state temperature, T2. (K) Gas
A spring-loaded piston-cylinder device contains of m=1 kg carbon dioxide. Initially, the spring has no force on the piston and P₁=500kPa, T = 150K, V₁ = 0.1m³. Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2, T₁=900K, V₂=0.3m³. The gas is an ideal gas. 2 (4)What's the boundary work against piston W ?_____in kj? b-p P1, V1, T1 P2, V2, T2
A tank of compressed air is at 40°C and 10 atm. 1 third of the gas is removed for inflating a car tire. The tank is allowed to exchange heat with the surroundings to maintain its temperature at all times. What kind of a process is this? What is the pressure remaining in the tank? a. Sketch the problem. b.Draw lines identifying the control volume, or control mass. c.Identify the states with numbers, letters, or descriptions such as “in” and “out”. d.Write down the knowns and unknowns. e.Identify what is being asked for. f.State all assumptions.
Air in a rigid tank is at 200oC and 150 kPa. The air is cooled to a final equilibrium state of 60oC . i. Determine the change in pressure of the air, kPa. ii. Show and label the process on a temperature versus volume (P-v ) diagram. The gas constant for air, R is 0.287 kJ/kg.K and the universal gas constant, Ru is 8.314 kJ/kmol.K.
One kilogram steam at 100C saturated vapor underwent heat transfer isometrically to 1MPa. Find the change in internal energy, change in enthalpy, work done and heat transferred. Two kilograms of Methane gas underwent an isopiestic process from 200C to 300C. Find the change in internal energy, change in enthalpy, work done and heat transferred. Sketch the T-s and P-v diagrams.
Q-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 Water
43.0 g of 40Ar gas are sealed in a container at an initial pressure of 1.50 atm and an initial volume of 0.0500 m3 (state 1). The gas is then made to expand very, very quickly until its volume doubles (state 2). Then it is compressed very, very slowly back to its initial volume (state 3). Show the two processes on a pV diagram, and fill out the table below. p1 = p2 = p3 = V1 = V2 = V3 = T1 = T2 = T3 =
At the end explain the relationships between system constants R, C,, and C₂ when a certain perfect gas is heated at constant pressure from (15+A)°C to 95°C, the heat required is1136kJ/kg. When the same gas is heated at a constant volume between the same temperature the heat required is 808kJ/kg.
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.