Concept explainers
The method by which the control volume energy rate balance accounts for work done as mass flows across a boundary.
Answer to Problem 4.1E
Explanation of Solution
The amount of a substance flowing through a channel per unit of time is known as the mass flow rate. Since energy is an extensive property, it can neither be created nor be destroyed. The energy rate balance of a control volume can be obtained using energy balance criteria and doing some modifications in the closed system energy rate balance equation as follows:
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Chapter 4 Solutions
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- Apply the first law to a constant-volume process.arrow_forward1 kg of a fluid expands reversibly according to a linear law from 4.5 bar to 1.6 bar, the initial and final volumes are 0.004 m' and 0.02 m The fluid is then cooled reversibly at C. constant pressure. and finally compressed reversibly according to a law pV back to the initial conditions of 4,5 bar and 0.004 m Determine the work done in each process and the net work of the cycle. Sketch the cycle on a p-v diagram. =constantarrow_forwardA fluid at 0.5 bar occupying 0.07 m3 is compressed reversibly to a pressure of 9.8 bar and specific volume of 0.4 m3/kg according to the law pvn = c. The fluid then expands reversibly according to the law pv2 = c to 1.2 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the net work for the process in Joules to round figure. No mega or Kilo for units.arrow_forward
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- solve the following problem: Steam enters a turbine operating at steady state at 850oF and 450 lbf/in2 and leaves as a saturated vapor at 1.4 lbf/in2. The turbine develops 12,000 hp, and heat transfer from the turbine to the surroundings occurs at a rate of 2 x 106 Btu/h. Neglect kinetic and potential energy changes from inlet to exit. Determine the exit temperature, in oF, and the volumetric flow rate of the steam at the inlet, in ft3/s.arrow_forwardSteam enters a turbine operating at steady state at 850oF and 450 lbf/in2 and leaves as a saturated vapor at 1.2 lbf/in2. The turbine develops 12,000 hp, and heat transfer from the turbine to the surroundings occurs at a rate of 2 x 106 Btu/h. Neglect kinetic and potential energy changes from inlet to exit. Determine the exit temperature, in oF, and the volumetric flow rate of the steam at the inlet, in ft3/s.arrow_forward2. Please consider a universe that consisted of two very, very large bodies that exchanged 1,000 Btu. The first body was at 1,000 R. Please determine the change in entropy of (1) each body and (2) of the universe (in Btul R) if the second body was at a. 200 •R. b. 500 R c. 1,000 R.arrow_forward
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