A6cm od, 2cm thick copper hollow sphere [k=386w/m. c] is uniformly heated at the inner surface at a rate of 150w/m2. the outside surface is cooled with air at 20c with a heat transfer coefficient of 10w/m2.oc. calculate the temperature of the outer surface

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.