Roto-flow turbo expander

I did not understand thermodynamics at university. It seemed to be an exotic subject with no relevance to my future as a refinery process engineer. It wasn t until I had spent many years working with steam turbines, surface condensers, steam distribution systems, and most especially vacuum ejectors that I realized that without a firm understanding of thermodynamics, I could not operate or troubleshoot such facilities with any degree of confidence. 

For those of you who work in the liquefied natural gas industry, all of the above principles discussed relating to steam apply to light liquid hydrocarbons as well. The Roto-Flow Turbo Expander, which you use to partially liquefy the natural gas, is much the same as a steam turbine. That is, the motive gas is partially condensed to ethane and propane, as the temperature of the gas is converted to velocity, as the gas flows into the Roto-Flow turbine case. Much of the torque developed by the expander turbine is derived from the latent heat of condensation of the liquefied petroleum fractions. 

Change in entropy = Change in heat divided by temperature Or 

But what does this actually mean to ordinary people Not people like Einstein or Edison or Marie Curie, but to people like you and me, who got a D in thermo  

Entropy is a measure of the amoimt of heat that s available at a particular temperature. Lots of entropy is really bad. Heat available at a low temperature, which means the heat has lots of entropy, is bad. 

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