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
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
A tank contains a two-phase liquid-vapor mixture of Refrigerant 22 at 10 bar. The mass of
saturated liquid in the tank is 25 kg and the quality is 60%. Determine the volume of the tank, in
m3, and the fraction of the total volume occupied by
An electric motor draws a current of 10 amp with a voltage of 110 V, as shown in Fig. P2.62.
The output shaft develops a torque of 9.7 Nm and a rotational speed of 1000 RPM. For
operation at steady state, determine for the motor
(a) the elect
Carbon monoxide gas (CO) contained within a piston-cylinder assembly undergoes three
processes in series:
Process 1-2: Constant pressure expansion at 5 bar from V1 = 0.2 m3 to V2 = 1 m3.
Process 2-3: Constant volume cooling from state 2 to st
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
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}