A pump in a chilled water system draws 8 kW to pump of 15 kg/s of water at 5 C through a system. The pressure entering the pump is 250 kPa absolute and that leaving is 700 kPa absolute. Determine the pump efficiency and the temperature rise of the water through the pump.

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?