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Consider the cylindrical, 0.12-m-diameter radiation shield of Example 9.5 that is installed concentric with a 0.10-m-diameter tube carrying steam. The spacing provides an air gap of L = 10 mm.
(a) Calculate the heat loss per unit length of the tube by convection when a second shield of 0.14-m diameter is installed, with the second shield maintained at 35°C. Compare the result to that for the single shield of the example.
(b) In the two-shield configuration of part (a), the air gaps formed by the annular concentric tubes are L = 10 mm. Calculate the heat loss per unit length if the gap dimension is L = 15 mm. Do you expect the heat loss to increase or decrease?
A sealed rigid tank of 1 m3 capacity contains 1.2 kg of water at 1 bar and 99.63 °C. To this tank we add heat until the pressure increases to 3 bar. What is the temperature at the end of the heating?
A process heater uses Dowtherm A heat transfer fluid to provide 850 kW of heat. Estimate the annual operating cost of the heater if the Dowtherm evaporator is 80% efficient and the price of natural gas is $4.60/MMBtu. Assume 8000 operating hours p..
Neglecting stator resistance and rotational losses, and assuming constant rotor resistance, determine the slip at maximum torque and the slip at full load.
Assuming that no lead was originally present, that all the 206Pb formed over the years has remained in the rock, and that the number of nuclides in intermediate stages of decay between 238U and 206Pb is negligible, calculate the age of the rock. (..
make a preliminary design for the absorption column. the feed will be 5000 kg/h of gas containing 8% v/v so2. the gas will be cooled to 20c. a 95% recovery of sulphur dioxie is required. the solubility data is provided in the table below
Develop the ordinary differential equations for each of the molecules in the cascade. (Each phosphorylated molecule is different from a nonphosphorylated molecule.)
Using the data below, calculate graphically the number of theoretical plates needed using an L/D of 1.6 times the minimum Reflux ratio Rm.
If the generated emfs are 200 and 210 V, respectively, determine the load voltage and the armature current of each machine.
A 1-liter container of nitrogen gas (N2) at a temperature of 23c is intially at a pressure of 1.25 atm. because of a slow leak the pressure falls to 1.15 atm 1 hour later what is the leak rate in molecules/second?
B is open to the atmosphere. the specific gravity for oil is 0.8, the distance h= 4 inches and the distance d= 6 inches. find the gage pressure and absolute pressure at A
A storage tank is purged continuously with a stream of nitrogen. The purge stream leaving the tank is saturated with the product stored in the tank.
But will only be known after you have chosen an alternative. Which alternative you will select based on the Expected value.
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