1 / 12

Δ S of Pure Substances, Isentropic Processes, and Property Diagrams

Δ S of Pure Substances, Isentropic Processes, and Property Diagrams. Δ S of Pure Substances. Can be calculated from defining equations However, very complicated. Generally use tables or EES Be careful mixing methods. can have different reference states. T-s diagram for water.

ginata
Download Presentation

Δ S of Pure Substances, Isentropic Processes, and Property Diagrams

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ΔS of Pure Substances,Isentropic Processes,and Property Diagrams

  2. ΔS of Pure Substances • Can be calculated from defining equations • However, very complicated. • Generally use tables or EES • Be careful mixing methods. • can have different reference states.

  3. T-s diagram for water

  4. Constant Volume Process

  5. Constant Pressure Process

  6. Isentropic Process An adiabatic reversible process will be constant entropy. However, an isentropic process is not necessarily an adiabatic reversible process.

  7. Ideal pumps, turbines, nozzles, and diffusers are isentropic and enable us to assign idealized efficiencies. Because the turbine is isentropic, s2 = s1 can help us find the final state.

  8. Use of T-s diagrams Entropy definition can be rearranged to: δQint rev = TdS Similar to dw = Pdv is area under P-v curve.

  9. One Trivial Example: Isothermal processes are also easy to integrate.

  10. h-s diagram Δh part indicates the work out of a steady- flow adiabatic turbine Δs part indicates the irreversibilities of the process

  11. T-s diagram of a carnot heat engine Wnet = QH - QL

More Related