2.44 As shown in Fig. P2.44, a gas contained within a piston-

cylinder assembly, initially at a volume of 0.1 m³, undergoes a constant

pressure expansion at 2 bar to a final volume of 0.12 m³, while being

slowly heated through the base. The change in internal energy of the

gas is 0.25 kJ. The piston and cylinder walls are fabricated from heat-

resistant material, and the piston moves smoothly in the cylinder. The

W/m² K, local atmospheric pressure is 1 bar.

ction heat

a. For the gas as the system, evaluate work and heat transfer, each

in kJ.

nd (b) the

e area.

Lations:

ction heat

= 298 K,

Hen probe

its outer

tion from

0.85, and

er whose

ed by the

xchanged

2.41 is at

- for con-

V/m².K.

d and the

face area.

47°C

0.93

b. For the piston as the system, evaluate work and change in

potential energy, each in kJ.

Piston

Patm

Gas

= 1 bar

2.45 A gas contained within

- p = 2 bar

V₁ = 0.1 m³

V₂ = 0.12 m³

(U₂-U₁) = 0.25 kJ

FIGURE P2.44

F

2.48

fillec

to th

The

Dete

2.49

V₁=

twe

0.25

dur

pot

2.5

rig

wh

1 E

mc

ро

2.

pr

0_

D

3

a