1. BITS Pilani
Pilani Campus
Lecture 13 – FIRST LAW ANALYSIS FOR
FIRST-
A CONTROL VOLUME
2. Compressor
A compressor receives 0.1 kg/s R-134a at 150
g
kPa, -10oC and delivers it at 1000 kPa, 40oC.
The power input is measured to be 3 kW. The
compressor h h t t
has heat transfer t air at 100 kP
f to i t kPa
coming in at 20oC and leaving at 25oC. How
much is the mass flow rate of air?
BITS Pilani, Pilani Campus
3. Mixing Chamber
In engineering applications, the
section where the mixing
process takes place is
commonly referred to as a
y
mixing chamber
The T elbow of an ordinary shower serves as the
T-elbow
mixing chamber for the hot- and the cold-water
streams. BITS Pilani, Pilani Campus
4. Thermal Power Plant
Equipments Involved with simple Thermal Power
Plant
• Boiler
• Turbine
• Condenser
• Pump
BITS Pilani, Pilani Campus
5. Thermal Power Plant
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
6. Thermal Power Plant
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
7. Thermal Power Plant
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
8. Thermal Power Plant
Boiler
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
9. Multi component systems
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
10. Multi component systems
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
11. Multi component systems
A modern jet engine has a temperature after
combustion of about 1500 K at 3200 kP as it enters
b ti f b t t kPa t
the turbine section, see state 3 Fig. P.6.100. The
compressor inlet is 80 kPa 260 K state 1 and outlet
kPa,
state 2 is 3300 kPa, 780 K; the turbine outlet state 4
into the nozzle is 400 kPa, 900 K and nozzle exit
,
state 5 at 80 kPa, 640 K. Neglect any heat transfer
and neglect kinetic energy except out of the nozzle.
Find the compressor and turbine specific work terms
and the nozzle exit velocity.
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
12. Multi component systems
BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956
16. Refrigerator
A R-410a heat pump cycle (refrigerator) shown in Fig. P6.99
has a R-410a flow rate of 0.05 kg/s with 5 kW into the
compressor. The following data are given
Calculate the heat transfer from the compressor, the heat
transfer from the R-410a in the condenser and the heat
transfer to the R-410a in the evaporator
R 410a evaporator.
BITS Pilani, Pilani Campus
