1. By standard legislation, by how much does the temperature drop when high-pressure nitrogen at 6.5 MPa is reduced to 0.5 MPa?
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1. By standard legislation, by how much does the temperature drop when high-pressure nitrogen at 6.5 MPa is reduced to 0.5 MPa? How to calculate it?
So what exactly is throttling, expansion, and cooling in air separation? This is what I mainly want to know, as well as how to calculate these processes
Enthalpy is composed of internal energy and volume energy, H=Q+PV. When PV changes, Q changes, which is manifested as a change in temperature. A pressure relief valve can be considered to represent an isenthalpic process, while an expander can be regarded as an isentropic process; it does more work, which results in a higher refrigeration efficiency. As for the calculations, they can be done manually using flow diagrams; it is better to use process simulation software such as Aspen, or any suitable small program if available
Assuming the inlet temperature is 30°C, this process can be considered an isenthalpic process; after pressure reduction, the temperature becomes 18.65°C. Note that the pressure relief valve calculation function has not yet been released.
Can this pressure relief valve be used to calculate the temperature of a mixed gas after pressure reduction?