SpinOffs

When and Why You Should Hire an Expert

by Barbara Shea on Aug 17, 2017 4:30:08 PM

Every company in the turbomachinery industry needs robust technical expertise to survive in this very mature business. Whether you make a rotating component or use one in a product, your in-house engineers have to consider many factors when designing a product. They must find the appropriate balance between the competing factors of higher efficiency, lower cost, ease of manufacturability and increased performance. Doing this task well requires insight across many disciplines. It also requires a deep understanding of the impact the various trade-offs made on the product and your bottom line.

The Best CFD Averaging Methods for Distortion

by Mark R. Anderson on Aug 9, 2017 3:24:38 PM

Three-dimensional flow fields typically have some degree of distortion in the flow properties and flow profiles across a given cross section. These distortions can be quite significant in regions that include the exit plane of the impeller. Because most designers are interested in averaged values of performance, the question often arises as to what averaging technique is the best to use.

One of the most important design choices facing a chiller compressor designer is whether to utilize open or shrouded impellers. The impacts of this verdict are wide ranging, which arguably makes this most basic selection the most critical one.

Important Considerations When Designing a Volute

by Jamin Bitter on Jul 26, 2017 1:56:37 PM

When designing a new compressor or pump, most of the focus is put on the impeller and diffuser because they are the elements that are responsible for the work input and its conversion from kinetic energy into static pressure. However, they are not the only elements in a typical turbomachine stage. The volute can also play a significant, and sometimes dominant, role in stage performance. This blog will explore important factors in volute design.

Design Tradeoffs and Compromises in Integrally Geared Turbomachinery

by Andrew Provo on Jul 21, 2017 10:14:08 AM

When designing turbomachines, the quality of the final product can often be improved by implementing a holistic approach to the engineering process. As with many complex mechanical systems there are a significant number of competing requirements that impact the overall success of the system. By fully understanding the nature of these compromises, and how the various subsystems interact, the design will be improved. This interplay is particularly noticeable in the design of integrally geared (IG) turbomachinery.

Why You Now Need to Learn More about Turbomachinery

by Dr. Nicholas C. Baines on Jul 21, 2017 9:15:46 AM

Once when asked about his priorities, British Prime Minister Tony Blair replied, “Education, education, education.” We can be sure he was not thinking specifically about courses in mechanical engineering, but his proclamation does highlight the fact that nobody in or out of public life can neglect the need for more or better knowledge.

Turbomachinery Textbooks Focused on Engineering Design

by Barbara Shea on Jul 14, 2017 9:42:54 AM

The vast majority of turbomachinery textbooks emphasize analysis when the heart of engineering is based in design. Concepts NREC is uniquely qualified to share the nature and process of engineering design. When Concepts NREC decided to write and publish a range of turbomachinery textbooks, the objective was to emphasize engineering design rather than analysis.  

How to Design a Pump for Reduced NPSH

by Kerry Oliphant on Jun 20, 2017 4:39:30 PM

Cavitation occurs in a pump when the bulk liquid pressure starts to approach the vapor pressure of the liquid, and cavities of vapor form as seen in Figure 1.  This figure shows the inlet of a cavitating pump tested in Concepts NREC’s water flow loop.  These cavities can degrade the head rise and efficiency of the pump, create instabilities, and cause significant damage to the pump impeller and other components.  To avoid these effects, a pump must operate with an inlet head that is at least as high as the required net positive suction head (NSPH) that the pump was designed to achieve.  The NPSH is the difference in the inlet head and the liquid vapor head (or vapor pressure converted to liquid head).  Many pumping systems would benefit from the ability to operate at lower NPSH and so reducing the required NPSH of a pump is often of great concern to pump designers.

Turbomachinery is the Key for Sustainable Development

by Thiago Ebel on Jun 15, 2017 4:28:44 PM

While common sense might lead one to conclude otherwise, increasing energy consumption worldwide is a good thing. Higher per capita energy consumption is associated with a higher quality of life: electricity for home appliances, transportation, affordable heating, lighting and so on. On the other hand, there is and should be enormous concern about the type of energy being used to fuel this increased consumption stemming from issues such as environmental impact, national security, etc.  

The chiller industry is under tremendous pressure to convert to new, more environmentally friendly refrigerants.  This change is driven by new global regulations including, the Montreal Protocol and European Union (EU) F-gas regulation. Many chiller OEMs are already announcing new lines of chillers redesigned to use this latest generation of refrigerants. OEMs that have not have started their redesign efforts have a lot of work to do.

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