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Flowstead v3.6.0

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@github-actions github-actions released this 11 Nov 17:09
v3.6.0
eed9107
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Flowstead v3.6.0 (app version 3.6.0).

Faster solves

  • Bubble and dew points are no longer calculated at every solve. They were most of a solve's time (four extra flashes per stream). A stream's editor, the results, a table that lists them and the documents ask for them when they are needed, so they still appear wherever they are shown.

Enthalpy and entropy as HYSYS

  • Enthalpy and entropy now include each compound's heat of formation and absolute entropy, as HYSYS reports them (Peng-Robinson, SRK and Lee-Kesler). Absolute values now compare with HYSYS; differences such as duties are unchanged.
  • Fluid package → Enthalpy and entropy switches back to DWSIM's reference. A case that types an enthalpy or an entropy keeps DWSIM's reference unless you change it.
  • The choice is saved with the case, so a case opened in Flowstead Web shows the same values.

Solve backward through more units

  • A stream leaving a heat exchanger, a splitter, a separator or a tank can now be given what it must be, as well as the streams of valves, heaters, coolers, pumps, compressors, expanders and pipes. For example, the gas leaving a separator at −10 °C and 90 mol/s finds the wellhead temperature and flow behind the choke.
  • A flow given behind a splitter or a separator finds the feed's flow. A product's enthalpy can be given too, and finds the feed temperature.

Fixes

  • Absolute entropy on HYSYS's basis was too low for n-butane and heavier normal paraffins (a liquid n-hexane showed a negative entropy). It now matches NIST.
  • Typing the first enthalpy into a case no longer switches the whole case to DWSIM's reference.

Install: download flowstead-v3.6.0.apk on your Android phone (Android 8.0 or newer, 64-bit), open it and allow installing from this source.

Coming from a 0.x test build? Those were signed with the public debug key and this release is signed with the release key, so Android can't install it over them: export each project you want to keep (project menu → Export DWSIM file), uninstall the old app, install this one and import the files (Projects → Import DWSIM file). Data-sheet fields and line-sizing criteria are not part of a DWSIM file. Later releases install as updates.

Solves on the phone: DWSIM runs on the device (Settings → Engine → On this phone, the default); the first solve after starting the app takes a few seconds while DWSIM loads. A remote Flowstead engine (docs/engine-setup.md) is optional.

Release certificate SHA-256: d7883cfc24f1cb62db989086d69d217beed109b5b84164ff5394ad9e3e0bb921. flowstead-v3.6.0-mapping.txt de-obfuscates crash reports. Status and known limitations: docs/STATUS.md.

Commit: eed9107

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