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A hot fluid passes through circular channels of a cast iron platen (A) of thickness LA = 30 mm which is in poor contact with the cover plates (B) of thickness L B = 7.5 mm. The channels are of diameter D = 15 mm with a centerline spacing of La = 60 mm. The thermal conductivities of the materials are k A = 20 W/m · K and k B = 75 W/m · K, while the contact resistance between the two materials is Rt,c = 2.0 X 10-4 m2 · K/W. The hot fluid is at Ti = 150°C and the convection coefficient is 1000 W/m2 · K. The cover plate is exposed to ambient air at T8 = 25°C with a convection coefficient of 200 W/m2 · K. The shape factor between one channel and the platen top and bottom surfaces is 4.25.
(a) Determine the heat rate from a single channel per unit length of the platen normal to the page, q;.
(b) Determine the outer surface temperature of the cover plate, Ts.
(c) Comment on the effects that changing the centerline spacing will have on q; and Ts. How would insulating the lower surface affect qi and Ts?
Your VHDL description should be structural and constructed from 3 behavioral VHDL 1-bit ALU blocks, a special behavioral VHDL 1-bit ALU block for the most significant bit and a behavioral VHDL block for the zero detect logic.
Write an instruction sequence to set bits 3, 2, 1, and 0 of memory location at $1000 to 1 and leave the upper four bits of the same locations unchanged. use hcs12/9s12 to program.
In a 10-μm long bar of donor-doped silicon, what donor concentration is needed to realize a current density of 1 mA/μm2 in response to an appliedvoltage of 1V.
i) Calculate the number of calls/hour/cell and the number of calls/hours/km2 ii) Calculate the number of users/hour/cell and the number of users/hours/channel iii) Find the modulation frequency for this system.
An electric field is expressed in rectangular coordinates by E = 6x2ax + 6y ay +4az V/m. Find: a.) VMN if point M and N are specified by M(2,6,1) and N(-3, -3, 2). b.) VM if V = 0 at Q(4, -2, -35)
Given and airplane whose velocity relative to air (airspeed)is 120 km/hr (heading), the direction of the velocity vector is 70degrees east of north. Velocity relative to ground(groundspeed) is 110 km/hr (course)
Suppose a standard single-phase transformer that has a rating of a 15 kVA, 600V/120V, 60 Hz is reconnected as an autotransformer to obtain 600 V primary to 720 V secondary voltage ratio.
Vs=310 V (Vrms=219 V) at the input of bridge rectifier Need LC filter at the output of bridge which can provide 240 V +-10V DC, with 2 A constant current. find method to find appropriate values of LC which can provide these specification.
suppose that the sequence 110010011 is used as a synchronization sequence preamble to a data packet. propose a method
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Suppose a coaxial capacitor with inner radius 1.0 cm, outer radius2.0 cm and length 1.0m is constructed with two differentdielectrics. When oriented along the z-axis, εr for0o
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