Refrigerant 22 in a refrigeration system enters one side of a counter-flow heat exchanger at 12
bar, 28oC. The refrigerant exits at 22 bar, 20oC. A separate stream of R-22 enters the other side
of the heat exchanger as saturated vapor at 2 b
Problem 3.133 Two kg of nitrogen (N2) gas are contained in a closed, rigid tank surrounded by a
10-kg water bath, as shown in Fig. P1.133. Data for the initial states of the nitrogen and water are
shown on the figure. The entire unit is well
5.77 A quantity ot‘woter within a piston-cylinder assembly executes a Carnot power cycle.
During isothermal expansion. the water is heated from saturated liquid at 5!} her until it is a
saturated vapor. The VEPDF then expands ailinhntieall}
Two kilograms of oxygen fills the cylinder of a piston-cylinder assembly. The initial volume
and pressure are 2 m3 and 1 bar, respectively. Heat transfer to the oxygen occurs at constant
pressure until the volume is doubled. Determine the he
Complete the following exercise using heat transfer relations:
(a) Referring to Fig. 2.12, determine the rate of conduction heat transfer, in W, for = 0.07
W/mK, A = 0.125 m2, T1 = 298 K, T2 = 273 K.
(b) Referring to Fig. 2.14, determine the