An automobile radiator may be viewed as a cross-flow heat exchanger with both fluids unmixed. Water enters the radiator at a flow rate of 0.05 kg/s and a temperature of 400 K, and leaves the radiator at 330 K. The water is cooled by air that enters at a rate of 0.75 kg/s with a temperature of 300 K. (a) If the overall heat transfer coefficient is 200 W/m2K, what is the required heat transfer surface area

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?