- #1
rancam
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This is a thermodynamics question.I am a beginner and know only algebra.Here's a description.A cylinder full
of CO2 gas at 670 psi is compressed by a piston.At the far end of the cylinder is a pipe,through which the CO2 gas flows to push a piston into another cylinder.At one third of the stroke the gas is still 670 psi because the gas that
flows through the pipe prevents the piston from compressing the gas,or because the gas is expanding and being compressed simultaneously.
Here are the questions;
1) It appears that the gas is compressed and expanded at the same time.Is it possible to compress and expand a gas simultaneously?
2)How would one calculate the entropy,enthalpy and temperature of the gas at the end of the one third of a stroke?Is it just a matter of calculating the these properties for expansion and compression and then taking either the difference or the average of the two?
3)I have read that increasing temperature causes entropy to increase and increasing pressure reduces entropy.Which influences entropy more,pressure or temperature?In this case at the end of the one third stroke,would the entropy,temperature and enthalpy of the 670 psi gas be more or less than at the beginning of the stroke?
of CO2 gas at 670 psi is compressed by a piston.At the far end of the cylinder is a pipe,through which the CO2 gas flows to push a piston into another cylinder.At one third of the stroke the gas is still 670 psi because the gas that
flows through the pipe prevents the piston from compressing the gas,or because the gas is expanding and being compressed simultaneously.
Here are the questions;
1) It appears that the gas is compressed and expanded at the same time.Is it possible to compress and expand a gas simultaneously?
2)How would one calculate the entropy,enthalpy and temperature of the gas at the end of the one third of a stroke?Is it just a matter of calculating the these properties for expansion and compression and then taking either the difference or the average of the two?
3)I have read that increasing temperature causes entropy to increase and increasing pressure reduces entropy.Which influences entropy more,pressure or temperature?In this case at the end of the one third stroke,would the entropy,temperature and enthalpy of the 670 psi gas be more or less than at the beginning of the stroke?