Seeking advice on temperature changes after air pressure reduction
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Since a pressure reducing valve is required on the device to reduce the air pressure, it is necessary to estimate the temperature after pressure reduction in advance. The conditions are as follows: the air volume is approximately 1000 Nm3/h, the temperature before depressurization is about 130 degrees, and the pressure is 3.0 MPa (gauge pressure). Reduce the pressure to 1.0 MPa. What’s the temperature approximately? If the air volume is reduced to 500 Nm3/h with all other conditions remaining unchanged, what will be the temperature after depressurization? I would appreciate it if fellow sailors could provide a detailed calculation method and steps. Thank you~~
I’m asking fellow sailors for help. Please assist me.
Is it necessary to check the temperature-entropy diagram of the air, or are there existing formulas that can be applied directly?
This is similar to the process of reducing steam temperature and pressure; the enthalpy value of air is determined using the temperature and pressure before pressure reduction, while the temperature is determined using the enthalpy value and pressure after pressure reduction
Could you help check it? I really can’t find a table of temperature and entropy for air here. Steam is available, though. Thank you!