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Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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
Transcribed Image Text:A reversible pump receives 40 kW of work to compress water from 1 bar to 5 bar. If the efficiency of the pump is 80%,
what will be the actual work necessary?
Select one:
a.
32 kW
O b. None
O c. 10 kW
O d. 50 kW
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- Nitrogen gas enters a 0.500 m diameter pipe at 31.0 °C, 2.50 atm (absolute), and 4.00 m/s. The pipe rises 31.0 ft and then falls 81.0 ft. The nitrogen gas exits the pipe at 31.0 °C and z, ft 1.60 atm (absolute). The ultimate goal is to find AÉk and AEp in the process. T, °C z, ft Assume N, behaves ideally. P, atm (absolute) и, m/s T, °C P, atm (absolute) и, т/s What is V 1, the volumetric flow rate of nitrogen gas into the pipe section? V1 = m³/s What is m, the mass flow rate into the pipe? m = kg/s What is u2 the average velocity of N2 leaving the pipe section? u2 = m/s What is AĖk, the change in kinetic energy of the gas between the end and the start of the pipe section? ΔΕΚ - J/sarrow_forwardEB, Parallel Pipes. Water flows into a smooth wall piping system through a pump which can provide a pressure head (Pg/pg = 30m) in the inlet manifold of the piping system. Water exits and enters the system at Pg = 0. The two pipe sections have: L1= 200m, D1 = 4cm; L2 = 100m, D2 = 2cm; 1= 2 = 0. For each of the two configurations pictured, find the total flow rate, Q, and pump power, Wp for (a) pipes in series; and (b) pipes in parallel. Neglect all minor losses in the inlet and exit piping manifolds and assume AV2 - 0 between the system inlet and outlet to and from the manifold. Hint: for parallel pipes the head loss is the same for each pipe and equal to the total pump head. SI constant Patm = 10^5 Pa; pwater - 1000 kg/m^3; pair ~ 1.2kg/m^3; μwater ~ 10^-3 N•s/m^2; Hair - 2 x 10^-5 N•s/m^2; g = 9.8 m/s^2 Expecting unit for (a) series: Q: 10^-4 m^3/s, Wp: 10^2W; (b) parallel: Q: 10^-3 m^3/s, Wp: 10^3 W. Li, D. La. De Li, D. L. 0₂arrow_forward
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