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The possible existence of an optimum insulation thickness for radial systems is suggested by the presence of competing effects associated with an increase in this thickness. In partic- ular, although the conduction resistance increases with the addition of insulation, the con- vection resistance decreases due to increasing outer surface area. Hence there may exist an insulation thickness that minimizes heat loss by maximizing the total resistance to heat transfer. Resolve this issue by considering the following system.
1. A thin-walled copper tube of radius ri is used to transport a low-temperature refrigerant and is at a temperature Ti that is less than that of the ambient air at T00 around the tube. Is there an optimum thickness associated with application of insulation to the tube?
2. Confirm the above result by computing the total thermal resistance per unit length of tube for a 10-mm-diameter tube having the following insulation thicknesses: 0, 2, 5, 10, 20, and 40 mm. The insulation is composed of cellular glass, and the outer surface convection coefficient is 5 W/m2 · K.
when the discharge upstream is suddenly increased to 70 cfs/ft. What is the speed and height of the surge wave
air at 40oc 1 bar and a volumetric flow rate of 60 m3min enters an insulated control volume operating at steady state
Air is initially at a temperature of 500 K and a pressure of 100 kPa. A process occurs so that the specific internal energy of the air increases by 200 kJ/kg (i.e. u2 - u1 = 200 kJ/kg). Modeling the air as an Ideal Gas, determine the final temperatur..
Describe what a riser is in the context of sand casting. What are its main functions? In light of Chvorinovs rule, what should be taken into account when determining the geometry, dimension, and location of a riser in a sand casting mold?
Sketch a preliminary layout for the following heat exchanger systems. Large air forced cooling tower. Small vertically mounted shell and tube. Spiral heat exchanger in duty standby configuration.
A vertical frictionless piston-cylinder device contains nitrogen at 125 kPa. The outside atmospheric pressure is 100kPa. The piston diameter is 25 cm. The height difference between the two columns of mercury manometer (in cm), connected to the side o..
The electronic components of a computer are cooled by air flowing through a fan mounted at the inlet of the electronic enclosure. At steady state, air enters at 18oC, 1 atm. For noise control, the velocity of the entering air cannot exceed 0.9 m/s. F..
air at 20 c 40 rh is mixed adiabatically with air at 40 c 40 rh in the ratio of 1 kg of the former to 2 kg of latter
an insulated piston-cylinder device contains 100 l of air at 400 kpa and 25degc. a paddle wheel within the cylinder is
in the movie eraser the bad guys had a gun that would shoot a 5 g aluminum slug at one quarter the speed of light. lets
air is used in a carnot cycle as a working substance . determine the efficiency of the cycle if as a result of an
an interior well is producing from a reservoir developed on a 40-acre square pattern which has the following
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