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In the central receiver concept of a solar power plant, many heliostats at ground level are used to direct a con- centrated solar flux qs" to the receiver, which is posi- tioned at the top of a tower. However, even with absorption of all the solar flux by the outer surface of the receiver, losses due to free convection and radiation reduce the collection efficiency below the maximum possible value of 100%. Consider a cylindrical receiver of diameter D = 7 m, length L = 12 m, and emissivity s = 0.20.
(a) Estimate the heat gain through the door for the worst case condition corresponding to no insulation (L = 0).
(b) Compute and plot the heat gain and the outer sur- face temperature Ts,o as a function of insulation thickness for 0 L 25 mm.
assume that the heat treatment supervisor in charge of processing the some gears is on an economy program directed
Ideal vapor-compression refrigeration cycle, An ideal vapor-compression refrigeration cycle, with ammonia as the working fluid, has an evaporator temperature of -20c and a condenser pressure of 12 bar
The 60W fan of a central heating system is to circulate air through the ducts. The analysis of the flow shows that the fan needs to raise the pressure of the air by 50Pa to maintain flow. The fan is located in a horizontal flow section whose diameter..
gaseous nitrogen is exposed to one face of a pure iron plate at 715oc. the surface concentration of nitrogen is
the piston diameter is dp 3 mm and the piston position is initially s1 5 cm from the bottom of the piston. at this
Consider a supersonic wind tunnel with test section Mach number of 2 and fixed geometry diffuser designed to operate with minimum stagnation pressure losses (smallest diffuser area).
What is the current factor of safety against a quick condition at A‘? (The FS is defined as the ratio of the critical gradient to the existing gradient).
a standard steel specimen of 13 mm diameter elongated 22 mm when it was subjected to a tensile force of 29.5 kn if the
A piston cylinder closed system expands from state 1 to state 2 due to heat addition and then is compressed from state 2 to state 3. If this process (1-2-3) is a cycle, what can be said about Temperature (T) and Pressure (P)?
hot water at an average temperature of 90oc passes through a row of eight parallel pipes that are 4 m long and have an
a small radiant heater has a metal strips 6 mm wide with a total length of 3 m. the surface emissivity of the strips is
Methane gas in a piston-cylinder assembly goes under an adiabatic (no heat transfer) quasi- equilibrium compression. (This process is called isentropic process). The pressure and volume of the gas during the process are related as PV 1.3=constant.
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