Aprocess fluid having a specific heat of 3500 j/kg · k and flowing at 2 kg/s is to be cooled from 80°c to 50°c with chilled water, which is supplied at a temperature of 15°c and a flow rate of 2.5 kg/s. assuming an overall heat transfer coefficient of 2000 w/m2 · k, calculate the required heat transfer areas using the ntu method for the following exchanger configurations: (a) parallel flow, (b) counterflow, and (c) shell-and-tube, one shell pass and two tube passes.

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. 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?

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)