The discussion revolves around calculating the power consumption during the compression of steam, specifically from a saturated state at 50°C to a saturated state at 100°C and 1 bar. Participants explore various methods for this calculation, including enthalpy changes and ideal gas equations, while addressing the differences between gas and vapor behavior during compression.
Participants do not reach a consensus on the methods for calculating power consumption, with multiple competing views on the applicability of gas laws to steam and the behavior of steam during compression. Disagreements persist regarding the assumptions of temperature and saturation states throughout the process.
Some participants highlight the need for specific enthalpy values and the degree of superheating to accurately calculate power consumption. There are unresolved questions about the assumptions made regarding adiabatic processes and the definitions of gas versus vapor.
This discussion may be of interest to those studying thermodynamics, particularly in the context of steam systems, as well as professionals involved in engineering applications related to fluid dynamics and energy systems.
The final temperature is not 100 C, so you can't use the data at 100 C for anything. The final temperature is 450 C, and that results in a much lower volume compression ratio. (For some reason, you seem obsessed with 100 C).pranj5 said:As per wikipedia (https://en.wikipedia.org/wiki/Water_(data_page)#Water.2Fsteam_equilibrium_properties), density of steam at 20C saturated level is 0.01728 kg/m3 and at 100C it's 0.5974 kg/m3. Density in inversely proportional to volume and kindly count the compression ratio by volume.
The higher the final temperature, the lower the volume compression ratio.pranj5 said:I haven't said anything about temperature, but rather pressure. The exhaust steam will be at 1 bar pressure. And, as far as I know, the higher the temperature, lesser will be density i.e. bigger will be the volume.
From the ideal gas law,pranj5 said:"The higher the final temperature, the lower the volume compression ratio."
How?