Fundamentals Of Engineering Thermodynamics, 9th Edition Epub Reg Card Loose-leaf Print Companion Set
9th Edition
ISBN: 9781119456285
Author: Michael J. Moran
Publisher: Wiley (WileyPLUS Products)
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Chapter 2, Problem 2.19CU
To determine
The concept of net energy transfer by working for a refrigeration or heat pump cycle.
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Five kg of steam is contained within a piston-
cylinder assembly. It undergoes an expansion from
state 1, where the specific internal energy is
u_1=2709.9 kJ/kg to state 2, where u_2=2659.6
kJ/kg. During the process, heat is transferred to the
steam with a magnitude of 80 kJ. Also, a paddle Ww=-18.5 kJ
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 energy transfer by work from the
steam to the piston during the process, in kJ.
Indicate whether the work is done on or done by the
system.
Q=+80 kJ
5 kg of
steam
W
u₁ = 2709.9 kJ/kg
U₂ = 2659.6 kJ/kg
piston
=?
An automobile industry using piston cylinder arrangement for their operation it under goes a thermodynamic cycle which includes three processes with an initial state where pressure is 1.5 bar, volume is 2 m3 and internal energy equals to 480 kJ. The processes are as follows:
1)first stage to second stage: Compression with pV equals to constant to p2 is equals to 2 bar, U2 equals to 720 kJ
2)Second stage to third stage: work is equals to zero, and Q2-3 = - 150 kJ
3)Stage third to one: work is equals to 75 kJ. Neglecting kinetic energy and potential energy changes, find the heat transfer Q1-2 and Q3-1.
Back-work ratio of a gas turbine is defined as
a. turbine work/compressor work
O b: (turbine work - compressor work)/turbine work:
Oc (turbine work - compressor work)/compressor work
O d. compressor work/turbine work
Chapter 2 Solutions
Fundamentals Of Engineering Thermodynamics, 9th Edition Epub Reg Card Loose-leaf Print Companion Set
Ch. 2 - Prob. 2.1ECh. 2 - Prob. 2.2ECh. 2 - Prob. 2.3ECh. 2 - Prob. 2.4ECh. 2 - Prob. 2.5ECh. 2 - Prob. 2.6ECh. 2 - Prob. 2.7ECh. 2 - Prob. 2.8ECh. 2 - Prob. 2.9ECh. 2 - Prob. 2.10E
Ch. 2 - Prob. 2.11ECh. 2 - Prob. 2.12ECh. 2 - Prob. 2.13ECh. 2 - Prob. 2.14ECh. 2 - Prob. 2.15ECh. 2 - Prob. 2.16ECh. 2 - Prob. 2.17ECh. 2 - Prob. 2.1CUCh. 2 - Prob. 2.2CUCh. 2 - Prob. 2.3CUCh. 2 - Prob. 2.4CUCh. 2 - Prob. 2.5CUCh. 2 - Prob. 2.6CUCh. 2 - Prob. 2.7CUCh. 2 - Prob. 2.8CUCh. 2 - Prob. 2.9CUCh. 2 - Prob. 2.10CUCh. 2 - Prob. 2.11CUCh. 2 - Prob. 2.12CUCh. 2 - Prob. 2.13CUCh. 2 - Prob. 2.14CUCh. 2 - Prob. 2.15CUCh. 2 - Prob. 2.16CUCh. 2 - Prob. 2.17CUCh. 2 - Prob. 2.18CUCh. 2 - Prob. 2.19CUCh. 2 - Prob. 2.20CUCh. 2 - Prob. 2.21CUCh. 2 - Prob. 2.22CUCh. 2 - Prob. 2.23CUCh. 2 - Prob. 2.24CUCh. 2 - Prob. 2.25CUCh. 2 - Prob. 2.26CUCh. 2 - Prob. 2.27CUCh. 2 - Prob. 2.28CUCh. 2 - Prob. 2.29CUCh. 2 - Prob. 2.30CUCh. 2 - Prob. 2.31CUCh. 2 - Prob. 2.32CUCh. 2 - Prob. 2.33CUCh. 2 - Prob. 2.34CUCh. 2 - Prob. 2.35CUCh. 2 - Prob. 2.36CUCh. 2 - Prob. 2.37CUCh. 2 - Prob. 2.38CUCh. 2 - Prob. 2.39CUCh. 2 - Prob. 2.40CUCh. 2 - Prob. 2.41CUCh. 2 - Prob. 2.42CUCh. 2 - Prob. 2.43CUCh. 2 - Prob. 2.44CUCh. 2 - Prob. 2.45CUCh. 2 - Prob. 2.46CUCh. 2 - Prob. 2.47CUCh. 2 - Prob. 2.48CUCh. 2 - Prob. 2.49CUCh. 2 - Prob. 2.50CUCh. 2 - Prob. 2.51CUCh. 2 - Prob. 2.52CUCh. 2 - Prob. 2.53CUCh. 2 - Prob. 2.54CUCh. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10PCh. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - Prob. 2.16PCh. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - Prob. 2.28PCh. 2 - Prob. 2.29PCh. 2 - Prob. 2.30PCh. 2 - Prob. 2.31PCh. 2 - Prob. 2.32PCh. 2 - Prob. 2.33PCh. 2 - Prob. 2.34PCh. 2 - Prob. 2.35PCh. 2 - Prob. 2.36PCh. 2 - Prob. 2.37PCh. 2 - Prob. 2.38PCh. 2 - Prob. 2.39PCh. 2 - Prob. 2.40PCh. 2 - Prob. 2.41PCh. 2 - Prob. 2.42PCh. 2 - Prob. 2.43PCh. 2 - Prob. 2.44PCh. 2 - Prob. 2.45PCh. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Prob. 2.48PCh. 2 - Prob. 2.49PCh. 2 - Prob. 2.50PCh. 2 - Prob. 2.51PCh. 2 - Prob. 2.52PCh. 2 - Prob. 2.53PCh. 2 - Prob. 2.54PCh. 2 - Prob. 2.55PCh. 2 - Prob. 2.56PCh. 2 - Prob. 2.57PCh. 2 - Prob. 2.58PCh. 2 - Prob. 2.59PCh. 2 - Prob. 2.60PCh. 2 - Prob. 2.62PCh. 2 - Prob. 2.63PCh. 2 - Prob. 2.64PCh. 2 - Prob. 2.65PCh. 2 - Prob. 2.66PCh. 2 - Prob. 2.67PCh. 2 - Prob. 2.68PCh. 2 - Prob. 2.69PCh. 2 - Prob. 2.70PCh. 2 - Prob. 2.71P
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- Steam enters a turbine with an enthalpy of 1292 BTU/lb and leaves with an enthalpy 1098 BTU/lb. The transferred heat is 13 BTU/lb. What is the work (a) in BTU/min?arrow_forwardExplain the ENERGY BALANCE FOR CLOSED SYSTEMS.arrow_forwardHow do heat transfer and energy transformation affect heat engines in electricity production?arrow_forward
- In your own words, define efficiency as it applies to a device designed to perform an energy transformation.arrow_forwardIdentify valid processes as those that satisfy both the first and second laws of thermodynamics.arrow_forwardThe net change in volume (a property) during a cycle is always zero.arrow_forward
- A closed system undergoes a thermodynamic cycle with three steps: process 1-2 (from state 1 to state 2), process 2-3 (from state 2 to state 3), process 3-1 (from state 3 to state 1). During process 1-2, the system internal energy increases by 20J, during process 3-1, the system internal energy decreases by 15J. What is the change of system internal energy in process 2-3?arrow_forwardA closed system undergoes a thermodynamic cycle with three steps: process 1-2 (from state 1 to state 2), process 2-3 (from state 2 to state 3), process 3-1 (from state 3 to state 1). During process 1-2, the system internal energy increases by 20J, during process 3-1, the system internal energy decreases by 15J. What is the change of system internal energy in process 2-3? Enter the answer with the sign: + or - , but without units. For example, +27. Enter zero with no sign: 0.arrow_forwardA gas inside a piston-cylinder assembly undergoes a refrigeration cycle consisting of these three processes: Process 1–2: Compression with pV = constant from p1 = 1 bar, V1 = 1 m3, to p2 = 10 bar, V2 = 0.1 m3. Process 2–3: Constant volume heating until p3 = p1. Process 3–1: Constant-pressure, adiabatic expansion. There are no changes in kinetic or potential energy. a) Find the work for process 1–2 in kJ. b) Find the work for process 2–3 in kJ. c) Find the work for process 3–1 in kJ. d) Find the net work for the entire cycle in kJ. e) Find the net heat transfer for the entire cycle, in kJ. f) Find the heat transfer for process 3–1 in kJ. g) Knowing Q12 = –100 kJ, find the heat transfer for process 2–3 in kJ.arrow_forward
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