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A dormitory at a large university, built 50 years ago, has exterior walls constructed of Ls = 25-mm-thick sheath-
(a) Show the thermal circuit representing the steady-state heat transfer situation. Be sure to label allelements, nodes, and heat rates. Leave in symbolic form.
(b) Assume the following conditions: Too = 20°C, h = 50 W/m2 · K, and T1 = 30°C. Calculate the heat flux q0" that is required to maintain the bonded surface at T0 = 60°C.
(c) Compute and plot the required heat flux as a function of the film thickness for 0 Lƒ 1 mm.
(d) If the film is not transparent and all of the radiant heat flux is absorbed at its upper surface, determine the heat flux required to achieve bonding. Plot your results as a function of Lƒ for 0 Lƒ 1 mm.
Problem 1: A small city four transportation alternatives for a bus depot based on three criteria: architectural worth, cost and public opinion. The serviceable life of the depot is 40 years.
What are the key advantages and disadvantages of using a liquid metal as a coolant in a nuclear reactor? Briefly explain and describe and draw diagrams for the two typical configurations that can be used for a liquid metal cooled reactor.
a 0.3-m3 rigid tank is filled with saturated liquid water at 200oc. a valve at the bottom of the tank is opened and
a homeowner has devised a humidifier that is shown below. water is taken from the faucet and fed to a reservoir that
a rigid vellel with the volume of 10 m3 contains a water-vapor mixture at 400 kpa at 60 percent quality. the pressure
What are the critical temperatures and pressures for Air, Ammonia, CO2 and Propane? Determine the specific volume of Air, Ammonia, CO2 and Propane at 1000C and 20 bar. Determine the specific volume of Air, Ammonia, CO2 and Propane at 1000C and 20 bar..
It is desired to purchase a steel tank to store 20,000 US gallons of liquid propane; design pressure is 250 psig, and design stress is 20,000 psi. For steel, SG = 7.9. What will be the weight of metal in the shell (excluding foundation, valves, manho..
an apparatus for measuring thermal conductivity employs an electrical heater sand- wiched between two identical samples
a cylinder is fitted with a frictionless piston contains 10 lbm of r-134a at 100 psia 300 f. the system is cooled at
A. When the two torques are applied to the composite shaft, determine: the maximum shear stress magnitude in aluminium tube (1), the rotation angle of joint B and c.
when you move up from the surface of the earth the gravitation is reduced as g 9.807 - 3.32 times 10-6 z with z as the
consider incompressible viscous flow between two very long plates separated by a distance h. the bottom plate is
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