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1. Consider an opaque, gray surface whose directional absorptivity is 0.8 for 0 () 60° and 0.1 for () > 60°. The surface is horizontal and exposed to solar irradia- tion comprised of direct and diffuse components.
(a) What is the surface absorptivity to direct solar radiation that is incident at an angle of 45° from the normal? What is the absorptivity to diffuse irradiation?
(b) Neglecting convection heat transfer between the surface and the surrounding air, what would be the equilibrium temperature of the surface if the direct and diffuse components of the irradiation were 600 and 100 W/m2, respectively? The back side of the surface is insulated.
An air heater may be fabricated by coiling Nichrome wire and passing air in cross flow over the wire. Consider a heater fabricated from wire of diameter D=1 mm, L= 2m, electrical resistivity rho=10^-6 ohms, thermal conductivity k=25W/mK, and emiss..
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A two-dimensional reducing bend as shown is used to control flow rate and direction of flow in a home air conditioning duct. In the reducing bend shown, there is a linear velocity profile at section (1). The flow is uniform at sections (2) and (3). T..
Determine the Fourier transform methods to determine the response of the following systems for the given input
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what is the type of analog anti aliasing filter in DSA HP3566a? is that butterworth, chebyshev, inverse chebyshev or elliptic? and what order of that filter? thanks very much.
an engineer proposes to buy a machine for 100000 today that will save 60000 in labor costs at the end of each of the
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