4.83 As shown in Fig.

P4.83, a 247.5-ft3 tank contains

saturated vapor water initially at

30 lbf/in.2 The tank is

connected to a large line

carrying steam at 180 lbf/in.2,

450°F. Steam flows into the

tank through a valve until 2.9 lb

of steam have been added to the

tank. The valve is then closed

and the pressure in the tank is

40 lbf/in.² Determine the

specific volume, in ft3/lb, at the

final state of the control volume

and the magnitude and

direction of the heat transfer

between the tank and its

surroundings, in Btu.