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Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible expla- nation for this situation (with supporting calculations) by considering a room whose air temperature is main- tained at 20°C throughout the year, while the walls of the room are nominally at 27°C and 14°C in the sum- mer and winter, respectively. The exposed surface of a person in the room may be assumed to be at a tempera- ture of 32°C throughout the year and to have an emis- sivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m2 · K.
the water in a large lake is to be used to generate electricity by the installation of a hydraulic turbine-generator at
a gravimetric analysis of atmospheric air results in approximately 23.15 oxygen and 76.85 nitrogen. what is the partial
determine the dimentionless parameters that characterize the average velocity of the flow in a smooth pipeline if the
in the recent years the united states produced 50.8 percent of its electricity in the amount of 1.6181012 kwh from
you have been asked to estimate the cost of 100 prefabricated structures to be sold to a local school district. each
What is the mass of the lead weight, if 100 J of heat is lost from the water after the weight falls a distance of 3 m.
a cannon-ball of 5 kg acts as a piston in a cylinder of 0.15 m diameter. as the gun-powder is burned a pressure of 7
Air undergoes a poly tropic process in a piston-cylinder assembly from P1 = 1 atm, T1 = 70ºF to P2 = 3 atm. Employing the ideal gas model with constant specific heats at 80ºF, determine the work and heat transfer per unit mass, in Btu/lbm, if
a 180 degree elbow takes in water density water 1000 kgm3 at an average velocity of 1 ms at the horizontal inlet where
Colorado State equilibrium code - Use the general Gibbs energy minimization approach
consider a device with one inlet and one outlet. if the volume flow rates at the inlet and at the outlet are the same
the power p required to drive a fan is believed to depend on density p flow rate q impeller dia. d and angular veloctiy
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