A natural-draft cooling tower receives 250,000 ft3/min of air at standard atmospheric pressure, 70 oF, and 45 percent relative humidity. The air leaves saturated at 100oF. 3500 gallons per minute of water at 104 oF is cooled. Calculate (a) the temperature of the water at the tower exit, and (b) the necessary height of the tower if the total pressure losses are 2.00 lbf/ft2.

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?