an air stream is used to boil a water stream in a steady flow insulated exchanger. the air enters this exchanger at 100 kpa and 227 c and leaves at 100 kpa and 127c the water enters as saturated liquid at 200 kpa and leaves saturated vapor at 200 kpa what is the change in the enthalpy of the water

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?