A380-l tank contains steam, initially at 400c, 3 bar. a valve is opened, and steam flows out of the tank at a constant mass flow rate of 0.005 kg/s. during steam removal, a heater maintains the temperature within the tank constant. determine the time, in sec, at which 75% of the initial mass remains in the tank. also, determine the specific volume, in m^3 /kg, and pressure, in bar, in the tank at that time.

Explanation:

The given data is as follows.

   Tank volume (V) = 380 L = 0.38

   Initial pressure () = 3 bar

  Temperature (t) =

 Outlet mass flow rate () = 0.005 kg/s

  Final mass () =  

First, we will calculate the initial mass as follows.

                       =

                       = 0.368 kg

and,    

also,      

As,      

                      =

                      = 18.4 s

                   =

                   = 1.376

According to the table A-4, value of pressure at and T = is 2.5 bar.

Therefore, value of is 18.4 s, is 1.376 and is 2.5 bar.

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