1- Two stage compressor with suction pressure and temperature of (100kPa) and (300K). The compression ratio for the low pressure stage is (5.5:1) and for high pressure ratio is (6.5:1). The temperature of the air leaving the intercooler is (47°C). Determine the work done in the two stages of compression on air, the heat loses in the two stages. Take the compression according to PV¹2C. 2- Prove that the heat rejected from a compressor, of the compression is according to the law PV-C is determined by the following relation for each stage. ('-.*)--(*#* -»)- *·
1- Two stage compressor with suction pressure and temperature of (100kPa) and (300K). The compression ratio for the low pressure stage is (5.5:1) and for high pressure ratio is (6.5:1). The temperature of the air leaving the intercooler is (47°C). Determine the work done in the two stages of compression on air, the heat loses in the two stages. Take the compression according to PV¹2C. 2- Prove that the heat rejected from a compressor, of the compression is according to the law PV-C is determined by the following relation for each stage. ('-.*)--(*#* -»)- *·
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
![Problems-3
1- Two stage compressor with suction pressure and temperature of (100kPa) and
(300K). The compression ratio for the low pressure stage is (5.5:1) and for
high pressure ratio is (6.5:1). The temperature of the air leaving the intercooler
is (47°C). Determine the work done in the two stages of compression on air,
the heat loses in the two stages. Take the compression according to PVC.
2- Prove that the heat rejected from a compressor, of the compression is
according to the law PV-C is determined by the following relation for each
stage.
n(k-1 CpT
k(n-1))
3- Two stage air compressor compress air from (100kPa), (300K) to (4200kPa).
The compression is according to (PV32 C), the intercooling is ideal. Find 1-
the work done in the compressor.2- the required quantity of water to absorb
the heat in the intercooling if the water temperature rice not exceed (15°C). 3-
the heat loses by the two stages and the intercooling.
4- Two stage compressor delivered air at (1760kPa). The compression is
according to PV-C for both stages. Clearance volume for the low pressure
cylinder is (4%)of the stroke volume. At the beginning of compression stroke
for the low pressure cylinder, the pressure is (100kPa). The atmospheric
pressure and temperature are (105kPa) and (25°C) respectively. The
temperature at the beginning of every compression stroke is (35°C) and the
intermediate pressure is (400kPa). Determine the volumetric efficiency and
the compressor work per (kg) of air.
5- Multi stages compressor is designed to rise the pressure from (100kPa) to
(10000kPa). The compression ratio do not exceed (4:1). Determine (1) number
of stages (2) the actual compression ratio (3) inter mediate pressure.
78
6- Three stages air compressor compresses air from (100kPa) to (3300kPa) and
delivered to the storage tank at the high pressure. The initial temperature is
(27°C) and the compression is according to the law (PV2C) for all
compression stages. By assuming the maximum work and ideal intercooling
and neglecting effects of valves and clearances, determine the power required
to compress (16m'/min) measured at the compression line and the
intermediate pressures.
7- Three stages compressor takes the air at pressure (100kPa) and temperature
(27°C) and delivers it at (800okPa. Considering ideal intercooling Find the
minimum work done in the compressor per (Ikg) and the heat rejected in the
intercoolers if the compression is according to PV22.
8- Three stage single acting air compressor with ideal intercoolers takes air with
a pressure and temperature at the end of the suction line (100kPa) and (27°C)
respectively. The delivering from the last stage at a pressure of (7200kPa). The
volumetric flow rate of air at the end of the suction condition is (8m'/min).for
minimum work required determine: 1) the output pressure of the first and
second stage.2) cylinders volume ratio. 3) indicating energy required.
Neglecting the clearance and assuming the compression according to
PV12 C.
9- Determine the brake work of two stage compressor that compresses
(300m'/hr)of air from (100kPa) and (27°C) to (3400kPa). The air is cooled by
intercooler to (40°C) at pressure (600kPa). Assume the mechanical efficiency
to be (85%) and the compression is adiabatic.
10-
Compressor compresses air to (1050kPa). The pressure and temperature of air
entering the compressor at the suction line are (100kPa) and (300K)
respectively. The air enters the high pressure stage after leaving the intercooler
at (35°C) and (350kPa). Determine 1- the power required to compress
(22.5kg/min) of air. 2- the water mass flow rate to intercooler if the
temperature rise of (5°C). assume the polyyropic index is (1.25).
11- Determine the minimum work required to compress air at (100kPa) and
(300K) to (900kPa) in two stages. The compression is adiabatic and the
intercooler is ideal. Find the save in energy as comparison with single
compression.
12- Two stage compressor compress air from (100kPa) and (300K) to (3600kPa)
for minimum work and ideal intercooler. Determine the cylinders diameter
ratio if the stroke length is equal for the two stages. Determine the work done
per kg of air, if the compression according to PV13 C](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F293f2bc6-4b11-4918-b9b7-b2ff87657004%2Fc7486326-8206-479b-8eda-6c99f0ccb3d1%2Fs2yq3q9_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Problems-3
1- Two stage compressor with suction pressure and temperature of (100kPa) and
(300K). The compression ratio for the low pressure stage is (5.5:1) and for
high pressure ratio is (6.5:1). The temperature of the air leaving the intercooler
is (47°C). Determine the work done in the two stages of compression on air,
the heat loses in the two stages. Take the compression according to PVC.
2- Prove that the heat rejected from a compressor, of the compression is
according to the law PV-C is determined by the following relation for each
stage.
n(k-1 CpT
k(n-1))
3- Two stage air compressor compress air from (100kPa), (300K) to (4200kPa).
The compression is according to (PV32 C), the intercooling is ideal. Find 1-
the work done in the compressor.2- the required quantity of water to absorb
the heat in the intercooling if the water temperature rice not exceed (15°C). 3-
the heat loses by the two stages and the intercooling.
4- Two stage compressor delivered air at (1760kPa). The compression is
according to PV-C for both stages. Clearance volume for the low pressure
cylinder is (4%)of the stroke volume. At the beginning of compression stroke
for the low pressure cylinder, the pressure is (100kPa). The atmospheric
pressure and temperature are (105kPa) and (25°C) respectively. The
temperature at the beginning of every compression stroke is (35°C) and the
intermediate pressure is (400kPa). Determine the volumetric efficiency and
the compressor work per (kg) of air.
5- Multi stages compressor is designed to rise the pressure from (100kPa) to
(10000kPa). The compression ratio do not exceed (4:1). Determine (1) number
of stages (2) the actual compression ratio (3) inter mediate pressure.
78
6- Three stages air compressor compresses air from (100kPa) to (3300kPa) and
delivered to the storage tank at the high pressure. The initial temperature is
(27°C) and the compression is according to the law (PV2C) for all
compression stages. By assuming the maximum work and ideal intercooling
and neglecting effects of valves and clearances, determine the power required
to compress (16m'/min) measured at the compression line and the
intermediate pressures.
7- Three stages compressor takes the air at pressure (100kPa) and temperature
(27°C) and delivers it at (800okPa. Considering ideal intercooling Find the
minimum work done in the compressor per (Ikg) and the heat rejected in the
intercoolers if the compression is according to PV22.
8- Three stage single acting air compressor with ideal intercoolers takes air with
a pressure and temperature at the end of the suction line (100kPa) and (27°C)
respectively. The delivering from the last stage at a pressure of (7200kPa). The
volumetric flow rate of air at the end of the suction condition is (8m'/min).for
minimum work required determine: 1) the output pressure of the first and
second stage.2) cylinders volume ratio. 3) indicating energy required.
Neglecting the clearance and assuming the compression according to
PV12 C.
9- Determine the brake work of two stage compressor that compresses
(300m'/hr)of air from (100kPa) and (27°C) to (3400kPa). The air is cooled by
intercooler to (40°C) at pressure (600kPa). Assume the mechanical efficiency
to be (85%) and the compression is adiabatic.
10-
Compressor compresses air to (1050kPa). The pressure and temperature of air
entering the compressor at the suction line are (100kPa) and (300K)
respectively. The air enters the high pressure stage after leaving the intercooler
at (35°C) and (350kPa). Determine 1- the power required to compress
(22.5kg/min) of air. 2- the water mass flow rate to intercooler if the
temperature rise of (5°C). assume the polyyropic index is (1.25).
11- Determine the minimum work required to compress air at (100kPa) and
(300K) to (900kPa) in two stages. The compression is adiabatic and the
intercooler is ideal. Find the save in energy as comparison with single
compression.
12- Two stage compressor compress air from (100kPa) and (300K) to (3600kPa)
for minimum work and ideal intercooler. Determine the cylinders diameter
ratio if the stroke length is equal for the two stages. Determine the work done
per kg of air, if the compression according to PV13 C
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