Design Considerations for Turbo Expander Supersonic Turbines with Liquid to Gas-Liquid Flow Transition

by Oleg Dubitsky, Corporate Fellow, Director of Corporate Technology on Sep 28, 2020 10:50:05 AM

A small turbine (for ORC, air liquification processes) , operating with low volumetric flows at inlet and significant pressure ratio in a single stage configuration (to reduce costs) is often associated with flow of media with transition from liquid to gas-liquid state, with operating levels of Mach numbers above 1.8 at nozzle exit, that assumes convergent-divergent nozzle geometry, and may require partial admission.

Using an Economizer in Centrifugal Compressor Chiller Cycles

by Daniel V. Hinch, Corporate VP Sales and Marketing, Concepts NREC on Sep 18, 2020 11:00:00 AM

In the chiller industry, the evolution of centrifugal compressor chiller cycles has led to an interesting and powerful cycle and related compressor configuration which involves reinjection of refrigerant between stages. Such systems are thermodynamically identified broadly as cascade cycle options and have the common objective of improving the Coefficient of Performance (COP) of the standard refrigeration cycle.

Optimization using Dakota in Concepts NREC’s TurboOPT II

by Rachel Moore, Senior Software Engineer on Sep 11, 2020 11:00:00 AM

Automated optimization is becoming more and more common place in the turbomachinery industry today.  What was once exclusively the domain of academics and high-end researchers, has become much more widespread today.  The rise of optimization is directly related to ever increasing computer power available and the advent of new software tools to set it up.  Virtually every category of turbomachinery has adopted it, at least to some degree.  One can find many examples of advanced optimization in the open literature but more practical applications can add value to your product line in a very reasonable time and effort.  

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