Afinned – tube, cross flow heat exchanger (both fluids unmixed)is designed to cool oilwhich enters at 100 ºc and 2 kg/s. cold water is used for this duty which enters at 20 ºc and 0.48 kg/s. determine:
a) the exit temperature of the water.
b) the exit temperature of the oil.
c) the heat transfer rate.
hint: 1) use the suitable equation to calculate the effectiveness (do not use any figure).
2) use eqn. (11.20) and eqn.(11.21) to find the fluid outlet temperatures
data
oil heat capacity, cp = 2.0 kj /kg°c
water heat capacity, cp = 4.170 kj /kg°c
overall heat transfer coefficient u = 400 w/m2.k
surface area of the heat exchanger = 12.5 m2

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia