Given that there are 1/4 approximately 12 no. 1 inch (internal diameter) steel pipes; a) Determine the effective length of the pipes to the wet areas given that the required pressure is 39.24kPa at a discharge flow rate of 0.001 m/s.

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?