Question

In: Physics

Is it possible to compress air adabatically from kPa, 15oC, to (a) 200 kPa, 30oC ?...

Is it possible to compress air adabatically from kPa, 15oC, to (a) 200 kPa, 30oC ? (b) 200 kPa, 105oC ?

Solutions

Expert Solution

Yes it is possible to compress air adabatically

Temperature of the air decreases the pressure also decreases

The temperature of the air increases the pressure also increase

Because air contains number of gas molecules

So it contains polyatomic Nature

Degrees of freedom value r=4/3

According to the concept of kinetic theory of gases

Therefore the air is not compress in both cases because the temperature increases


Related Solutions

Air enters a constant diameter pipe at a pressure of 200 kPa. At the exit of...
Air enters a constant diameter pipe at a pressure of 200 kPa. At the exit of the pipe the pressure is 120 kPa, the Mach number is 0.75, and the stagnation temperature is 330°C. Determine the inlet Mach number and the heat transfer per unit mass of air.
An air compressor operating in adiabatic steady flow takes in air at 17 C, 200 kPa...
An air compressor operating in adiabatic steady flow takes in air at 17 C, 200 kPa and discharges is at 1300 kPa. Calculate the minimum work required to drive the compressor assuming the compressor has i) constant specific heats. ii) non-constant specific heats.
At steady state, air at 200 kPa, 330 K, and mass flow rate of 0.5 kg/s...
At steady state, air at 200 kPa, 330 K, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. The inlet cross-sectional area is 6 cm2. At the duct exit, the pressure of the air is 100 kPa and the velocity is 250 m/s. Neglecting potential energy effects and modeling air as an ideal gas with constant cp = 1.008 kJ/kg · K, determine: (a) the velocity of the air at the...
An adiabatic gas turbine uses air to produce work. Air expands adiabatically from 600 kPa and...
An adiabatic gas turbine uses air to produce work. Air expands adiabatically from 600 kPa and 287 C to 90 kPa and 67 C. Take specific heats at room temperature (300 K). a) Find the isentropic efficiency of the turbine. b) Find the work produced by the turbine for a mass flow rate of 2.5 kg/s. c) If the mass flow rate of air is again 2.5 kg/s, find the entropy generation under steady conditions
1 kg / s of steam is compressed in an adiabatic compressor from 200 kPa and...
1 kg / s of steam is compressed in an adiabatic compressor from 200 kPa and 200 ° C to 3000 kPa and 400 ° C. How powerful is the compressor? is this transformation possible (briefly argue)?
Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The...
Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The temperature at the inlet to the first turbine stage is 1400 K. The expansion takes place isentropically in two stages, with reheat to 1400 K between the stages at a constant pressure of 300 kPa. A regenerator having an effectiveness of 100% is also incorporated into the cycle. The turbine and the compressor each have am isentropic efficiency of 80%. Determine the following: (a.)...
One way to store a lot of energy is to compress air in a large cave....
One way to store a lot of energy is to compress air in a large cave. The air starts at the corner marked by the black dot, where P = 1 atmosphere, V = 1 cave volume (let's choose 1,000,000 cubic meters), and T = 300 K. It is then adiabatically compressed to half the volume by a pump. As the air comes out of the pump it is hotter (how hot? what is the pressure?), but it cools to...
(a) How much work is required to compress 4.92 mol of air at 19.9
(a) How much work is required to compress 4.92 mol of air at 19.9
A gas turbine expands air adiabatically at 1000 kPa and 550 ⁰C to 120 kPa and...
A gas turbine expands air adiabatically at 1000 kPa and 550 ⁰C to 120 kPa and 130⁰C. Air enters the turbine through a 0.25 m 2 opening with an aveage velocity of 45 m/s, and exhausts through a 1 m2 opening. Assume the air is ideal gas with constant specific heats. Take the constant pressure specific heat and gas constant of air as Cp= 1.05 kJ/(kg K) and R=0.287 kJ/(kg K), respectively. Determine; (a) the mass flow rate of air...
Air is supplied to a convergent–divergent nozzle from a reservoir where the pressure is 100 kPa....
Air is supplied to a convergent–divergent nozzle from a reservoir where the pressure is 100 kPa. The air is then discharged through a short pipe into another reservoir where the pressure can be varied. The cross-sectional area of the pipe is twice the area of the throat of the nozzle. Friction and heat transfer may be neglected throughout the flow. If the discharge pipe has constant cross-sectional area, determine the range of static pressure in the pipe for which a...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT