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Let us consider a solar powered water heater. The solar collector surface is coated with black chrome, whose emissivity can be approximated to be 0.9 for radiation at wavelengths less than 5 m and 0.05 for radiation greater than 5 m. How much heat does this surface deliver to the water circulating in the collector when solar radiation is incident on the surface at a rate of 600 W/m2 and the absorber surface temperature is 70C. The air and effective sky temperatures are 25C and 15C, respectively, and the convection heat transfer coeffcient is 10 W/m2 -K. Assume that the temperature of the sun is 5800 K.
the true stress-strain curve of a material obeys the power-hardening law with n 0.18. a piece of this material was
the tensile strength of a copper sheet increases to 45 ksi by 25 cold work. we want to produce a 0.040 thick sheet of
The tank cover is airtight, and the pressure above the water surface is 2 atm gage. The system is at sea level. Determine the max height to which the water stream could rise.
air undergoes a process with the states given below. find the change of entropy using the ideas gas table and compare
the temperatures on the faces of a plane wall 15 cm thick are 375 and 85 degrees celsius. the wall is constructed of a
but they vary in number of outputs, interfacing, cascadability, current limiting, and drive capability. As always, examine the data sheets carefully before substituting these parts! What is a Capacitor?
a steel ball of diameter 3.0 mm starts sinking with zero initial velocity in olive oil was viscosity is 0.90p. how soon
Mainframe computing used to be the only way to manage enterprise data. Then personal computers changed the data management scene. How do these two computing styles differ, and how did shift to PC-based computing evolve.
a pump accepts liquid water at 60 degf and 14 psia and compresses it isothermally to a pressure of 100 psia. the pump
r-134a is throttled from 1200kpa and 40oc to 200kpa. it is known that heat of 5kjkg is lost from r-134a to the
an engineer proposes to buy a machine for 100000 today that will save 60000 in labor costs at the end of each of the
problem 1a horizontal steel pipe having a diameter of 5 cm is maintained at a temperature of 50degc in a large room
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