Blog Archive

Tiny Density Gradients, a Song by the Transcriticals

Brent Cullimore

Tiny Bubbles was a hit song by Don Ho (before even my time). Tiny Density Gradients just won’t make the charts.

But that’s what happens when you take a pure fluid substance to high enough pressure or temperature: the distinction between liquid and vapor disappears. Instead, you instead get a dense, spongy state called a “supercritical fluid.” It happens easily with carbon dioxide (aka CO2 in the chemical world or r744 in the refrigerant world) because of its relatively low critical temperature (31°C, 87.8°F).

Vapor Compression Cycles

Tuesday March 10th, 2pm MST

This webinar explains how the toolbox approach of Thermal Desktop and FloCAD can be used to design and simulate vapor compression cycles at various levels of detail. Applications include heat pumps, automotive climate control, and refrigeration systems.

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Working Fluid Mixtures

Thursday March 12th, 2pm MST

Working fluid mixtures can be as simple as air and water. Or as complex as ... well, air and water.

"Air" might be a simple perfect gas or a collection of real gases ... itself a mixture. "Water" might be a simple nonvolatile approximation of liquid water, or it might be a volatile liquid.

This webinar discusses mixture types, and repercussions such as pressure and temperature range limits. It illustrates both how to set initial conditions and how to determine what is going on in results.

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