Joule-Thomson (JT) Cooling

Joule-Thomson Design and Analysis

CRTech tools are used to model the complexities of Joule-Thomson or JT cooling systems, as either blow-down systems or closed cycles (e.g, Linde-Hampson). Because they provide compact and vibration-free cold heads, such coolers are popular for cooling of sensors and electronics including cryogenic and MEMS (microcooling) applications.

The combination of SINDA/FLUINT plus FloCAD® (an optional Thermal Desktop® module) can be used for detailed modeling, system-level modeling, and sizing and sensitivity analyses of cold heads and other heat exchangers.

Key features relevant for analyzing JT cooling systems include:

  • Real-gas and saturation dome properties readily available for the most commonly used fluids including hydrogen, helium, nitrogen, argon, CO2, methane, and propane. Additional and custom fluids (e.g., mixed gas coolers) descriptions can be created by CRTech or the user.
  • System-level heat exchangers (e.g., NTU, UAtot, effectiveness) for sizing (e.g., set an outlet temperature) and for high-level simulations
  • Complex heat exchangers in cold heads and in multi-stage coolers (regenerators, recuperators, intercoolers)
  • Transient analyses including tank blow-down and structural cool down
  • Expansion into the dome including two-phase heat exchange. See also Two-phase Flow Analysis.
  • Arbitrarily complex control systems (PID etc.) applied to valves, compressors, etc.
  • Access to parametric modeling and Advanced Design Modules (optimization and sizing, automated model calibration to test data, reliability and statistical design, etc.)

Sample Model of a JT Cold Finger

A sample model is available to illustrate the application of SINDA/FLUINT and Thermal Desktop/FloCAD to the modeling of the Joule-Thomson cycle. These examples demonstrate:

  • JT cryostat analysis
  • Design optimization and dynamic blow-down (chilldown) analysis
  • Modeling of labyrinth seals (even though they purposely leak in this application)
  • Modeling of heat exchangers, at both the system and detailed levels
    • Including application of compact heat exchanger (CHX) methodology
  • Use of FloCAD for both sketch-pad modeling and for geometric modeling

The models with documentation are available for download.

Click here to fetch the JT Modeling Example from our User Forum

 

Reacting Flows

Tuesday May 5th, 2pm MT (1pm PT, 4pm ET)

Reacting Flows is a capability that allows FloCAD to simulate fuel reformers, deal with the electrochemistry of flow batteries, predict combustion reactions in gas generations, and work with ionized and dissociated gases.

This webinar will explain how to use a working fluid as a reactant. It will also detail various options for determining reaction rates such as equilibrium, finite rate with stoichiometric coefficients, and percent complete based on inflowing reagents. Example applications are summarized.

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Dissolved Gases

Thursday May 7th, 2pm MT (1pm PT, 4pm ET)

When vapor meets liquid, it can condense. When gas (NCG) meets liquid, it can dissolve. When there is too much gas in the liquid, it can either evolve slowly at a wall or at the surface ... or it can come out explosively.

Whether your interests are environmental control, liquid propulsion, fire retardant delivery, or beer, this webinar offers a rare glimpse into an advanced modeling topic.

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