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Consider the transformer of Problem 8.103, whose lateral surface is being maintained at 47°C by a forced convection coolant line removing 1000 W. It is desired to explore cooling of the transformer by free convection and radiation, assuming the surface to have an emissivity of 0.80.
(a) Determine how much power could be removed by free convection and radiation from the lateral and the upper horizontal surfaces when the ambient temperature and the surroundings are at 27°C.
(b) Vertical fins, 5 mm thick, 75 mm wide, and 500 mm long, can easily be welded to the lateral surface. What is the heat removal rate by free convection if 30 such fins are attached?
CHEM 2001-INTRODUCTION TO CHEMICAL ENGINEERING - MATERIAL BALANCE ON TWO EQUIPNIENTS (ONE SHOULD BE REACTIVE AND OTHER NON REACTIVE )
Assume negligible miscibility between the aqueous and organic liquids in each other, and ignore any change in density on removal or addition of the enzyme to either stream.
A 60-Hz, 440-V, three-phase system feeds two balanced wye-connected loads in parallel. One load has a per-phase impedance of 8 + j3 Ω and the other 4 - j1 Ω.
(1) Determine the mass and the temperature of the steam in an insulated piston-cylinder arrangement if sufficient steam is admitted to displace the piston by one cubic foot. The cylinder originally is empty, and the piston main- tains a constant pres..
The heat capacity at constant pressure of hydrogen cyanide is given by the expression Cp[J/(mol ·°C)] = 35.3 + 0.0291T(°C) (a) Write an expression for the heat capacity at constant volume for HCN, assuming ideal gas behavior.
The slurry effluent from the reactor (digester), consisting of solid inert material from the ore and an aqueous solution of aluminum sulfate is then fed to a three-stage, countercurrent washing unit to separate the aqueous aluminum sulfate from th..
Where 'k1' and 'k2' are rate constants,tR,maxis the time at which the maximum concentration of 'R' is obtain and CR,maxis themaximum concentration of 'R'
The composition of a gas derived by the gasification of coal is, volume percentage: carbon dioxide 4, carbon monoxide 16, hydrogen 50, methane 15, ethane 3, benzene 2, balance nitrogen. If the gas is burnt in a furnace with 20% excess air
Burning the coke deposited on the catalyst particles generates all the heat necessary for catalytic cracking. Therefore, the coke burning rate is a critical parameter to control the rate of cracking. The composition of dry flue gas from the regenerat..
About 10 to 30 million cells at most can be made from a highly purified single hematopoietic stem/preprogenitor cell in vitro.
Additionally, the only stable isotope of fluorine is fluorine-19. Predict possible modes of decay for fluorine-21, fluorine-18, and fluorine-17.
Three identical impedances of 30 ∠30° Ω are connected in delta to a three-phase 173-V system by conductors that have impedances of 0.8 + j0.6 Ω each. Compute the magnitude of the line-to-line voltage at the terminals of the load.
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