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A new building to be located in a cold climate is being designed with a basement that has an L=200 mm thick wall. Inner and outer basement wall temperatures are t=20 c and t=0 c respectively. the architect can specify the wall material to be either aerated concrete block with k= 0.15 W/m.K or stone mix concrete. To reduce the conduction heat flux through the stone mix wall to a level equivalent to that of the aerated concrete wall, what thickness of extruded polystyrene sheet must be applied onto the inner surface of the stone mix concrete wall? Floor dimensions of the basement are 20 m * 30 m, and the expected rental rate is $50/m2/month. What is the yearly cost,in the terms of lost rental income, if the stone mix concrete wall with polystyrene insulation is specified?
if the exit velocity needs to be 27 ms and the nozzle tip has a diameter of 0.48 mm what is the volumetric flow rate
a two dimensional velocity field is described by the equation given below with a - 3 ms and b 12 ms. determine the
a gas turbine brayton cycle operates with an intercooler a re-heater and a regenerator. air enters the engine at 14 psi
Questions set on Entropy, Exergy, Cycles, Otto Cycle, Rankine Cycle. In a coal fired thermal power station, indicate where the exergy contained in the coal is destroyed. For each exergy destruction mechanism, explain whether there is a small..
a feed rate of 200gpm of a hydrocarbon mixture at 70c is being pumped from tank at 1 atm abs pressure to a distillation
steam enters an insulated nozzle with a velocity of 500 ms and a pressure of 5.0mpa and a temperature of 600 degrees
on a cloudless day the sunlight that reaches the surface of the earth has an intensity of about 1.2 103 wm2. what is
water with a quality of 70 is contained in a cylinder with a weight on a piston that maintains a water pressure of 500
A layer of water seperates two smooth surfaces a distance of 2r. Derive an experssion for the force needed to pul the two surfaces apart. Consider the bottom surface fixed. What is the force needed to seperate the top surface?
a 6.5m tall tank has a rectangular cross?section and is filled with water to a depth of 3.5m. assuming the pressure on
vinefera grapes are picked when the outside temperature is 35c and then cooled to 5c within a 12-h period. for each
If the bar is subjected to centric forces of magnitude P = 30 kN and knowing that EA = 70 GPa and EB = 105 GPa, determine the normal stress (a) in the aluminum layers, (b) in the brass layer.
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