Saturated steam coming off the turbine of a steam power plant at 40°C condenses on the outside of a 3-cm-outer-diameter, 35-m-long tube at a rate of 140 kg/h.

Determine the rate of heat transfer from the steam to the cooling water flowing through the pipe.

93.57 KJ/s

Explanation:

Rate of heat transfer from the steam to the cooling water = mass rate * Heat of vaporization of water at 40 °C

H vaporization of water 40 °C at saturation pressure = 2406.0 kJ / Kg

rate of heat transfer = 2406.0 kJ / Kg * 140 Kg / (60 * 60s) = 93.57 KJ/s