FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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kg
3. The working fluid in a steady flow process flows at a rate of 220
The fluid
min
rejects 100 -
KJ
passing through the system. The conditions of the fluid at the inlet
and outlet are given: V1 = 320 "; P, = 6.0 bar; U1 = 2,000 ; v1= 0.36 :
KJ
m3
and
kg
kg
m3
The suffix 1 indicates the
kg
KJ
V2 = 140 4; P2 = 1.2 bar; U2 = 1,400 :
; V2= 1.3
kg
condition at the inlet and 2 indicates the outlet of the system.
Determine the power capacity of the system in MW.
Q: The working fluid, in a steady flow process flows at a rate of 220 kg/min. The fluid
rejects 100 kJ/s passing through the system. The conditions of the fluid at inlet and outlet
are given as : C1 = 320 m/s, p1 = 6.0 bar, u1 = 2000 kJ/kg, v1 = 0.36 m3/kg and C2 = 140 m/s,
p2 1.2 bar, u2 = 1400 kJ/kg, v2 = 1.3 m3/kg. The suffix 1 indicates the condition at inlet
and 2 indicates at outlet of the system. Determine the power capacity of the system in MW.
The change in potential energy may be neglected.
Fluid
Fluid
leaves
System
enters
2. A power cycle receives energy QH by heat transfer from a hot reservoir at TH = 1200 R and rejects energy QC by heat transfer to a cold reservoir at TC = 400 R. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible.
(a) QH = 900 Btu, Wcycle = 450 Btu
(b) QH = 900 Btu, QC = 300 Btu
(c) Wcycle = 600 Btu, QC = 400 Btu
(d) Eff. = 70%
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Similar questions
- A closed system undergoes a thermodynamic cycle with 2 steps: process 1-2 (from state 1 to state 2), process 2-1 (from state 2 to state 1). During process 1-2, the system received energy by heat transfer of 25J. During process 2-1, energy was transferred from the system to its surrounding by heat transfer of 15J. This is a power cycle. True or false?arrow_forward1. A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Compression with PV = constant, from P₁ = 1 bar, V₁ = 2 m³ to V₂ = 0.2 m³, U₂ − U₁ = 100 kJ; 2 Process 2-3: Constant volume to P3 = P₁; Process 3-1: Constant-pressure and adiabatic process. Neglect the changes of kinetic and potential energy in all three processes. (a) Sketch the cycle on a P-V diagram; (b) Determine the net work (i.e., W12 + W23 + W31) of the cycle, in kJ; (c) Determine the heat transfer for process 2-3, in kJ. Hint: System's state variables remain unchanged after a cycle, i.e. (U₂ − U₁) + (U3 − U₂) + (U₁ − U3) = 0arrow_forwardThermodynamics Iarrow_forward
- A power cycle operating between two reservoirs receives energy QH by heat transfer from a hot reservoir at TH = 2000 K and rejects energy Qc by heat transfer to a cold reservoir at Tc= 400 K. For each of the following cases determine whether the cycle operates reversibly, irreversibly, or does not verify the second law of thermodynamics (make all necessary calculation for each case). a) QH= 1200 kJ and Wcycle = 1020 kJ b) QH= 1200 kJ and Qc = 240 kJ c) Wcycle = 1020 kJ and Qc = 600 kJ d) n =40%arrow_forwardA system consisting of a gas contained in a cylinder with a frictionless piston is taken around the closed path a→b→c→a where the process c→a is isothermal. During the closed cycle, the system expels 150 J to the environment. If the work done on the system during the isobaric leg b→c of the cycle is 250 J, what is the heat expelled/absorbed by the gas in the isothermal leg c→a in J.arrow_forwardThree sub steps of a thermodynamic cycle are employed in order to change the state of a gas from 1 bar, 1.5 cubic meter and internal energy of 512 kJ. The processes are: 1st step: Compression at constant PV to a pressure of 2 bar and internal energy of 690 kJ. 2nd step: A process where work transferred is zero and heat transferred is - 150 kJ. 3rd step: A process where work transferred is -50 kJ. without KE and PE changes, determine: a. heat transferred during 1st step (kJ) b. heat transferred during 3rd step (kJ)arrow_forward
- Problem 1 A power cycle operating between two reservoirs receives energy Qn by heat transfer from a hot reservoir at TH 1888 K and rejects energy Oc by heat transfer to a cold reservoir at Tc=377 K. For each of the following cases determine whether the cycle operates reversibly, irreversibly, or does not verify the second aw of thermodynamics (make all necessary calculation for each case): %3D a) QH=1700 kJ and Wrcle = 1600 b) QH=702 kJ and Qc= 351 kJ c) =94 % d) QH=1700 kJ and Wcl= 1800 kl %3D %3Darrow_forwardThe refrigerator shown in the figure below operates at steady state with a coefficient of performance (COP) of 5.0 within a kitchen at 23 °C. The refrigerator rejects 4.8 kW by heat transfer to its surroundings from metal coils located on its exterior. Determine: (a) the power input, in kW.(b) the lowest theoretical temperature inside the refrigerator, in K.arrow_forward8Q Prove that, whenever a system undergoes a cycle, p<0 (b) T.arrow_forward
- A reversible heat pump cycle operates at steady state between hot and cold reservoirs at TH = 30°C and Tc 10°C, respectively. The rate of heat transfer at the high temperature is 10 kW. a. Determine the net power input, in kW. b. Determine the heat transfer rate from the cold reservoir at Tc, in kW. c. Determine the coefficient of performance of the cycle.arrow_forwardI need some help in how to solve this problem. Any help will be appreciated. Thanksarrow_forward7. A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a hot reservoir at TH = 1600 K and rejects energy QC by heat transfer to a cold reservoir at TC = 400 K. For each of the following cases determine whether the cycle operates reversibly, operates irreversibly, or is impossible. a. QH = 1000 kJ, ŋ = 75% b. QH = 1100 kJ, Wcycle = 800 kJ c. QH = 900 kJ, QC = 300 kJarrow_forward
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