Products

C&R Technologies® provides a suite of tools that can handle all of your heat transfer and fluid flow modeling problems. Built on top of our core solving engine, SINDA/FLUINT, we provide geometric (Thermal Desktop®, FloCAD®, RadCAD®, and SINDA/FLUINT) or nongeometric (Sinaps® and SINDA/FLUINT) GUI tools that can help you build and analyze any system. Review our Product Selection Matrix and Getting Started Guide for assistance in selecting the products which best meet your needs. All of our products are available for free evaluation.

We are dedicated to producing software tools that not only help heat transfer and fluid flow design engineers produce analytical answers, but also product solutions. Regardless of which GUI tool suite you select, you can apply advanced techniques that transcend traditional steady state and transient simulations into the realm of design optimization and statistical analyses. CRTech also offers the most comprehensive two-phase thermohydraulic analyzer available.

SINDA/FLUINT

SINDA/FLUINT is a comprehensive finite-difference, finite element, lumped parameter (circuit or network analogy) tool for analyzing complex heat transfer and fluid flow systems.
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Thermal Desktop

Thermal Desktop is a PC based thermal model builder with a built-in mesher. Thermal Desktop incorporates both familiar parameter based finite difference surfaces with finite elements using CAD technology to model heat transfer in a system. Thermal Desktop develops the capacitance and conductance network for input to SINDA/FLUINT. Additionally Thermal Desktop provides capabilities such as applying contact conductance, insulation, heat loads, and heaters.
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RadCAD

RadCAD is the thermal radiation analyzer for use with Thermal Desktop or standalone. RadCAD provides options for using Monte Carlo Ray Tracing or progressive radiosity to calculate form factors, radiation conductors, and heating rates for geometrically defined surfaces. RadCAD is an add-on module for Thermal Desktop.
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FloCAD

FloCAD is a graphical fluid analyzer module available for use with Thermal Desktop facilitating the integrated analysis of fluid and thermal systems within a CAD-based environment. FloCAD is an add-on module for Thermal Desktop which provides access to all of the capabilities in FLUINT.
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TD Direct

TD Direct is an add-on module for Thermal Desktop providing a bi-directional port to SpaceClaim, enhancing the CAD preparation and model maintenance processes. Analysts can extend the CAD preparation features in SpaceClaim by meshing surfaces and solids during import into Thermal Desktop, tag surfaces for heat loads, contact conductance, convection, and easily update the mesh if the part geometry changes.
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Sinaps

Sinaps has been deprecated. FloCAD now provides a superset of Sinaps non-geometric modeling features, including geometric options. Existing Sinaps models can now be exported to Thermal Deskop and FloCAD. Please contact CRTech for more information.
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dispersed vs. coalesced front

Tuesday, June 26, 2018, 1-2pm PT, 4-5pm ET

This webinar describes flat-front modeling, including where it is useful and how it works. A flat-front assumption is a specialized two-phase flow method that is particularly useful in the priming (filling or re-filling with liquid) of gas-filled or evacuated lines. It also finds use in simulating the gas purging of liquid-filled lines, and in modeling vertical large-diameter piping.

Prerequisites: It is helpful to have a background in two-phase flow, and to have some previous experience with FloCAD Pipes.

Register here for this webinar

FloCAD model of a loop heat pipe

Since a significant portion of LHPs consists of simple tubing, they are more flexible and easier to integrate into thermal structures than their traditional linear cousins: constant conductance and variable conductance heat pipes (CCHPs, VCHPs). LHPs are also less constrained by orientation and able to transport more power. LHPs have been used successfully in many applications, and have become a proven tool for spacecraft thermal control systems.

However, LHPs are not simple, neither in the details of their evaporator and compensation chamber (CC) structures nor in their surprising range of behaviors. Furthermore, there are uncertainties in their performance that must be treated with safety factors and bracketing methods for design verification.

Fortunately, some of the authors of CRTech fluid analysis tools also happened to have been involved in the early days of LHP technology development, so it is no accident that Thermal Desktop ("TD") and FloCAD have the unique capabilities necessary to model LHPs. Some features are useful at a system level analysis (including preliminary design), and others are necessary to achieve a detailed level of simulation (transients, off-design, condenser gradients).

CRTech is offering a four-part webinar series on LHPs and approaches to modeling them. Each webinar is designed to be attended in the order they were presented. While the first webinar presumes little knowledge of LHPs or their analysis, for the last three webinars you are presumed to have a basic knowledge TD/FloCAD two-phase modeling.

Part 1 provides an overview of LHP operation and unique characteristics
Part 2 introduces system-level modeling of LHPs using TD/FloCAD.
Part 3 covers an important aspect of getting the right answers: back-conduction and core state variability.
Part 4 covers detailed modeling of LHPs in TD/FloCAD such that transient operations such as start-up, gravity assist, and thermostatic control can be simulated.