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Consider a jacket made up of six layers of 0.1 mm thick synthetic fabric (k = 0.15 W/m.K) with 1.2 mm thick air space (k = 0.026 W/m.K) between the fabric layers.
Assuming the inner surface temperature of the jacket to be 25 C and the surface area to be 1.25 m2, determine the heat loss through the jacket when the temperature of the outdoors is -5 C and the heat transfer co-efficient of outer surface is 25 W/m2.K.
What would be the thickness of a wool fabric (k = 0.04W/m.K) if the person has to achieve the same level of thermal comfort wearing a thick wool coat instead of a jacket.
An insulated piston-cylinder assembly containing a fluid has a stirring device operated externally. The piston is frictionless, and the force holding it against the fluid is due to standard atmospheric pressure and a coil spring. The spring constant ..
surface geostrophic velocity 0.5 ms density 1026kgm3 gravity 9.8ms ring radius 50km. you take velocity measurment
measurements are made on a particular part. the results are approximately normally distributed with a mean of 1.250
a rigid 110-l steam cooker is arranged with a pressure relief valve set to release vapor and maintain the pressure once
What is the work you get out of each kJ of heat extracted from the basin? Repeat for the case that the water is at 100C. Comment on why efficient car engines run so hot.
Calculate the heat transfer per kilogram of air between sections (1) and (2), and the stagnation pressure at section (2).
superheated steam at 15 mpa and 600 c enters the turbine of a steam power plant and is expanded to an exit pressure of
a storage tank is 40 feet above a river. water is pumped from the river to the storage tank at a rate of 0.095m3s. the
an element of a material experiences stresses sigmaz ?20 mpa sigmax 40 mpa tauexz 40 mpa sigmay 80mpa. the shear
What outer sphere diameter is required so that the convection heat transfer from the inner sphere is the same as if it were placed in a large, quiescent environ- ment with air at Too = 20°C?
an ideal diesel cycle has r23 and rc1.86. determine the specific net-work i.e. net-work per unit mass flow in terms of
a 70 meter tall cylindrical tower with outer diameter 12 meters is exposed to a very cold evening where the temperature
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