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

B2. The heat energy of 1605 kJ is supplied to saltwater in the steam generator to heat from 25°C to 104°C for the generation of water vapor, Take the density & specific heat of the solution as 1028 kg/m³ & 3 J/kg°K respectively. Determine the quantity of saltwater in the steam generator. I Solution: i) Change in Temperature (in K) ii) Mass of the saltwater (in kg) iii) Quantity (Volume) of salt water (in m³)
Carbon dioxide (molar mass 44 kg/kmol) expands reversibly in a perfectly thermally insulated cylinder from 3.7 bar, 220 0C to a volume of 0.085 m3. If the initial volume occupied was 0.02 m3, calculate the final pressure in bar to 3 decimal places. Assume nitrogen to be a perfect gas and take cv = 0.63 k J / k g K.
2.43 A steel tank contains 6 kg of propane (liquid + vapor) at 20°C with a volume of 0.015 m. The tank is now slowly heated. Will the liquid level in- side eventually rise to the top or drop to the bottom of the tank? What if the initial mass is 1 kg instead of 6 kg?
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
You press as hard as you can on the plunger of a closed syringe and measure the volume when the syringe is in ice water, air and hot water. Of the three variables, P, V, T, which are the same for all three cases and which are different.b. For the variables that change, explain their dependence using the ideal gas law.
A spring-loaded piston-cylinder device contains m= 1kg of carbon dioxide. Initially, the spring has no force on the piston and P₁ = 500kPa, T₁=150K, V₁ = 0.1m³. 1 Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2, T₂=900K, V₂=0.3m³. The gas is an ideal gas. 2 (1)How to determine the pressure P at the state 2? 2 O A. O B. OC. O D. P1, V1, T1 P. = 2 V T V T 1 V T 2 V T 1 V V 1 2 V 2 T 1 2 T T 1 2 1 P₁ P₁ P₁ P₁ P2, V2, T2
3-4. In each case, determine the requested property values and show the states on carefully-labeled p-v and T-v diagrams: (a) For H20 at p = 60 lbf/in.?, T= 358°F, determine v in ft/lb and u in Btu/lb. (b) For Propane at T = 50°C, v = 0.02861 m/kg, determine p, in bar. (c) For Ammonia at T= – 10 °C, v = 0.7 m/kg, determine p in bar and u in kJ/kg. (d) For H20 at p = 30 lbf/in.², x = 0.7 (70%), determine T in °F, v in ft/lb, and u in Btu/lb.
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
c. What is the internal energy, u, in kJ/kg of refrigerant R22 at temperature T=-10°C. and specific volume v=0.055 m³/kg? Draw a p-v and T-o diagram and locate the state. What is the phase of the state?
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 Δt = 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 mass of the gas, m__________ (kg)
Task 3 A 3 m³ tank contains air at 15 C and 400 kPa is connected through a valve to another tank containing 5 kg of air at 40 C and 300 kPa. After 10 minutes, the valve is opened, and the whole system will reach thermal equilibrium with the surroundings (T= 25 C). Determine the volume of the second tank and the final pressure of air. Explain the relationships between system constants for a perfect gas. In addition, discuss under what conditions is the ideal-gas assumption suitable for real gases?
An ideal gas is changed from p1 = 1bar, v1= 10m3 to p2 =10 bar , v2 = 1m3 , calculate Q & W for the follwing process: a- Isothermal process. b- adiabatic compression followed by cooling process at constant pressure. c- Heating at constant volume followed by cooling at constant pressure? Take Cp= (5/2)R & Cv=(3/2) R