A system consisting of a power cycle and a heat pump cycle, each operating between hot and cold reservoirs whose temperature are 500 K and 300 K, respectively. All energy transfers are positive in the directions of the arrows. The accompanying table provides two sets of steady-state data, in kW. For each set of data, determine if the system is operating in accord with the first and second laws of thermodynamics. Power cycle Heat pump cycle ăn Úc Weycte n ếc Wycte 80 60 20 100 80 20 (a) 60 40 20 (b) 120 80 40 cycle Power cycle - Hot reservoir. T₁= 500 K O'n m l'c Oc Cold reservoir, Te-300 K cycle Heat pump

A system consisting of a power cycle and a heat pump cycle, each operating between hot and cold reservoirs whose temperature are 500 K and 300 K, respectively. All energy transfers are positive in the directions of the arrows. The accompanying table provides two sets of steady-state data, in kW. For each set of data, determine if the system is operating in accord with the first and second laws of thermodynamics. Power cycle Heat pump cycle ăn Úc Weycte n ếc Wycte 80 60 20 100 80 20 (a) 60 40 20 (b) 120 80 40 cycle Power cycle - Hot reservoir. T₁= 500 K O'n m l'c Oc Cold reservoir, Te-300 K cycle Heat pump

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

The figure below provides steady-state operating data for an ideal vapor-compression refrigeration cycle with Refrigerant 134a as the working fluid. The mass flow rate of refrigerant is 30.59 lb/min. State 3 Expansion valve -4 Hot region 5 Cout Condenser Compressor mi = 30.59 Evaporator Oin Cold region lb min W р T h S (lbf/in.2) (°F) (Btu/lb) (Btu/lb.°R)
Q1. (Reading: Çengel and Boles, Thermodynamics: An Engineering Approach, 8th Ed., Pages 307-311) The amount of energy waste by a refrigerator increases by a number of malpractices. For example; opening the refrigerator door frequently will increase energy waste as the warmer air outside replaces the cool air inside. It is also not recommended to place the hot foods into the refrigerator before cooling them to the room temperature. Imagine a typical household refrigerator with an internal temperature of 4 °C. The refrigerator has a coefficient of performance of 1.4. The internal dimensions of this refrigerator are 186 cm (height) x 84 cm (width) x 75 cm (depth). The half of the refrigerator volume is used for storing food items. The air filling the other half of the refrigator volume contains 0.004 kg moisture/kg air on average. While the moisture content of the air in the kitchen is 0.01 kg/kg air, the temperature and pressure in the kitchen are 23°C and 97 kPa, respectively. Assuming…
within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of A gas three processes: Process 1-2: Constant volume, V = 0.06 m², U2 - U, = 40.4 kJ Process 2-3: Expansion with PV = constant, U3 - U2= 0 Process 3-1: Constant pressure, P =3 bar, W31 = (-20) kJ There are no significant changes in kinetic or potential energy. %3D Identify the process on a sketch of p-V diagram plotted for the cycle. Formulate the expression for heat transfer for process 2-3 and process 3-1. (Hint: Apply first law of thermodynamics for closed systems) (a) (b) (c) Solve to find the net-work for the cycle and heat transfer for the process 2-3 and Heat transfer for process 3-1, in kJ Identify if the above system executes a power cycle or a refrigeration cycle. Give (d) reason.
Given the following situations, tell whether it applies the first law of thermodynamics or second law of thermodynamics. Draw a smiley face if applies the first law and a heart if it applies the second law. 1. Food digestion 2. Rusting of iron 3. Photosynthesis 4. Using aircon during summer 5. Simple motor 6. Growing younger 7. Plugging TV to watch a program 8. Riding a bicycle 9. Generator 10. Heat flows from lower to higher temperature
QI A five kilograms of steam contained within a piston-cylinder assembly undergoes an expansion from state 1, where the specific internal energy is u, 2709.9 kJ/kg. to state 2, where uz = 2659.6 kJ/kg. During the process, there is heat transfer to the steam with a magnitude of 80 kJ. Also, a paddle wheel transfers energy to the steam by work in the amount of 18.5 kJ. There is no significant change in the kinetic or potential energy of the steam. Determine the en- ergy transfer by work from the steam to the piston during the process, in kJ. 5 kg of steam "pe? Ww-18.5 k Q= +80 kJ " = 2709.9 kkg g = 2059.6 kkg
What are some interesting application of thermodynamics in our daily life?
QI A five kilograms of steam contained within a piston-cylinder assembly undergoes an expansion from state 1. where the specific internal energy is u = 2709.9 kJ/kg. to state 2, where u, 2659.6 kJ/kg. During the process, there is heat transfer to the steam with a magnitude of 80 kJ. Also, a paddle wheel transfers energy to the steam by work in the amount of 18.5 kJ. There is no significant change in the kinetic or potential energy of the steam. Determine the en- ergy transfer by work from the steam to the piston during the process, in kJ. S kg of steam Ww-18.5 kl Q= +80 kJ #= 2709.9 kl/kg uy = 2059.6 k/kg
Air treated as an ideal gas and having a specific heat at constant volume Cv=1200 J/kg.K undergoes a process. During this process, heat is observed to exit the system with an amount of 10 k) while work is provided to the system with an amount of 24 kJ. If the initial temperature of air was 20 C, what is the final temperature of air if the mass of air undergoing the process is 0.2 Kg. Select one: O a. 81.5 C O b. 74.5 C O c. 69.5 C d. 78.3 C
HW4 EX1: An automobile moving over a rough road (Fig. 1.64) can be modeled considering (a) weight of the car body, passengers, seats, front wheels, and rear wheels; (b) elasticity of tires (suspension), main springs, and seats; and (c) damping of the seats, shock absorbers, and tires. Develop three mathematical models of the system using a gradual refinement in the modeling process. FIGURE 1.64 An automobile moving on a rough road. EX2 1.5* The consequences of a head-on collision of two automobiles can be studied by considering the impact of the automobile on a barrier, as shown in Fig. 1.65. Construct a mathematical model by considering the masses of the automobile body, engine, transmission, and suspen- sion and the elasticity of the bumpers, radiator, sheet metal body, driveline, and engine mounts. FIGURE 1.65 An automobile colliding with a barrier.
A closed thermodynamic system undergoes a cycle comprising four processes 1- 4. The following amount of heat is transferred through the system boundaries: Process 1: 50 kJ heat added to the system Process 2: 80 kJ heat removed from the system Process 3: 100 kJ heat added to the system Process 4: 40 kJ heat removed from the system What is the net work done in this cyclic process?
First law of Thermodynamics Conservation of Energy- Cycles Instruction: Completer the table and show solution step by step. Answer it in 1 hr.
Drag and Drop the correct answers in the blanks. A mass mis hanging from the end of a vertical spring that has a spring constant k. The equilibrium position of the mass, yo, is The total potential energy of the mass when it is displaced by s from the equilibrium position is given by Y. is zero + U(s) = ks + positive * negative 1 1 ks+ 21 + U(s) ks² + mgyo %3D U(s) mgyo