Saturated steam coming off the turbine of a steam power plant at 40°c condenses on the outside of a 3-cm-outerdiameter, 35-m-long tube at a rate of 63 kg/h. determine the rate of heat transfer from the steam to the cooling water flowing through the pipe. the properties of water at the saturation temperature of 40°c are hfg

Explanation:

According to the water table, the value of enthalpy of evaporation at a temperature of is 2406.0 kJ/kg.

Hence, we will calculate the rate of heat transfer by using the formula as follows.

               Q =

where,  m = mass

            = enthalpy of evaporation

Putting the given values into the above formula as follows.

              Q =

                  =

                  = 151578 kJ/h

or,              =

                  = 42.105 kW

Thus, we can conclude that rate of heat transfer from the steam to the cooling water flowing through the pipe is 42.105 kW.