Vapor Compression

Air Conditioning and Climate Control Design

SINDA/FLUINT and FloCADĀ® are used in automotive climate control, electronics cooling, and building HVAC design to simulate transient operation of vapor compression (VC) cycles and for the prediction of pressures, coefficients of performance, and condenser/evaporator liquid positions in a closed two-phase system with a fixed fluid charge. The programs can also be used to size components, to estimate the impact of tolerances and other variations, and to help estimate uncertainties given limited test data.

This widespread application of FloCAD to VC cycles is largely due to an increased demand for transient modeling of air conditioning systems needed to improve energy efficiency. FloCAD's unique abilities to analyze transient two-phase phenomena have been recognized as being critical to achieving accurate performance predictions.

A key advantage of using FloCAD to model VC cycle air conditioners is that it is not written specifically to address such systems: the general-purpose nature of the code can be exploited to integrate the VC cycle model with detailed models of the application (vehicle, building, electronics cabinet, etc.).

Sample Model: See Sample G: Vapor Compression Cycle in the SINDA/FLUINT Sample Problem Appendix (included with SINDA/FLUINT installation)

Applications in this field have included:
Results of Transient Air Conditioning Prediction

  • Component modeling (compressor, evaporator, heat exchangers, heat pump, condenser, throttling devices)
  • Tracking of charge for steady state and transient simulation
  • Cabin/room psychrometrics and venting
  • System pressure prediction
  • Parametrical analysis and design optimization for sizing of compressors and heat exchangers
  • Effects of time- and direction-varying body forces
  • Regenerative interconnections


Recorded Videos

FloCAD online training

Class times: May 2 & 4 from 10am to 2pm MT

Cost: $425

This online class will provide an introduction to fluid modeling components within FloCAD. The class will be held over a 2-day period, with daily sessions running approximately 4 hours each. The class uses a mixture of lecture, demonstrations, and self-paced tutorials to allow attendees to practice building fluid system models and interpreting results. The presentations will comprise 2 - 3 hours of each session, and the instructor will be available during the remainder of the time for questions during tutorials. Attendees must have basic working knowledge of SINDA and Thermal Desktop as these topics will not be covered but their usage is required for FloCAD.

Register here

Thermal Desktop, RadCAD, and TD Direct in-class training

Date: April 25-28, 2017, 8:00 a.m. to 5:00 p.m., daily
Location: Lakewood, CO

CRTech will be hosting introductory training for Thermal Desktop, RadCAD and TD Direct. Lecture and hands-on tutorials introduce attendees to basic Thermal Desktop and RadCAD usage and allow practice building models and interpreting results. The class will also introduce students to SpaceClaim direct modeling CAD interface and advanced meshing tools in TD Direct.

Daily Schedule

Day 1 and 2: Introduction to SINDA and Thermal Desktop
Day 3: Introduction to RadCAD
Day 4: Introduction to TD Direct

To learn more about this class and to register, visit our Training Page.

Anode and cathode of a flow battery

Using Sinaps? It is not too soon to get started with TD/FloCAD!

This webinar describes the process for converting from Sinaps to Thermal Desktop (TD) and FloCAD. This process includes using an exporter which works with Version 6.0 of the CRTech tool suite (expected to be released in May of 2017).

Come learn about the basics of TD/FloCAD, including many compelling features not available in Sinaps. The webinar will also cover how to manage the transition period, during which you may be using both programs simultaneously. This is also a chance to ask questions. 

If you missed this webinar, please contact us for the presentation material and recording.