Concepts NREC  Knows Refrigeration

We have broad experience working on refrigeration. 

Our engineering services group can work on any stage of chiller refrigerant conversion, from determining the effects of a ‘drop-in’ refrigerant change on capacity, to redesigning compressors for new refrigerants, to analyzing chiller system Balance of Plant impact.  

In addition, Concepts NREC’s Agile Engineering Design System® software can help OEM’s in-house designers more quickly and accurately (higher performance, better COP) convert to the latest generation of refrigerants.

We also manufactures and sells specialized turbomachinery products that serve well-defined niche applications. The DeepChill™ Air Cycle Refrigeration System using air as the refrigerant in place of CFCs or other harmful coolants offers better efficiency than more traditional refrigeration cycles such as Cascade-, LN2-, and Ammonia-based systems, making air cycle refrigeration well suited and safe for food processing.


Technical Papers

Development of A Meanline Model for Preliminary Design Of Recirculating Casing Treatment In Turbocharger Compressors
Presented At: ASME Turbo Expo 2018

A Novel Non-Radial Turbocharger Turbine Created Using Numerical Optimisation
Presented At: National Laboratory of Engine Turbocharging Technology of China 2016

Designing Turbochargers with an Integrated Design System
Presented At: ASME Turbo Expo 2013

Turbocharging the Internal Combustion Engine - (Presentation Slides) 
Presented At: ASME Turbo Expo 2013

Aero Design Challenges in Wide-Operability Turbocharger Centrifugal Compressors
Presented At: SAE World Congress 2012

Meanline Modeling of Ported Shroud Turbocharger Compressor
Presented At: ASME Turbo Expo 2012

Experimental and Computational Analysis of Impact of Self Recirculation Casing Treatment on Turbocharger Compressor
Presented At: SAE World Congress 2010

Modeling and Manufacturing of Turbocharger Compressors 
Presented At: SAE World Congress 2010

Radial and Mixed Flow Turbine Options for High Boost Turbochargers
Presented At: 7th International Conference on Turbochargers and Turbocharging


Case Studies


Concepts NREC designs, manufactures and tests turbochargers and turbocharger components for diesel and gasoline engines as well as compressor and turbine stages for gas turbine engines. We can also provide auxiliary system components for engines including fuel, oil and water pumps.

Waste Heat Recovery

Concepts NREC has extensive experience in the field of waste heat recovery, including providing ORC turbines for exhaust heat recovery from diesel and gas turbine engines.

Air, Land, Water

We cover the full range of transportation industries, including passenger cars, trucks, F1 racing, off-road vehicles, marine craft of all sizes, and aircraft piston, turbojet and turbofan engines.

Case Studies


Concepts NREC Develops, Manufactures, and Sells its Own Products

In addition to contract manufacturing complete turbomachinery products for customers, Concepts NREC manufactures and sells specialized turbomachinery products that serve well-defined niche applications.

These products are jointly developed with customers who first establish a market need for a new or improved technology. Concepts NREC then supplies the development expertise to turn their specification into a successful product. However, rather than just providing services for a fee, development costs are shared, enabling Concepts NREC to establish additional applications and markets for the product and generate noncompetitive sales. The results allow development costs to be amortized over larger production quantities, and both companies further benefit by producing a better product at a lower cost.

Website Refrigeration HERO image


Technical Papers

Agile Products Support (APS)

APS is Concepts NREC’s software maintenance and support program that elevates us from just a software provider to a valued partner. 

An APS subscription is included with all annual licenses and is a highly-recommended option for perpetual software licenses. Every software customer is supported for one month following purchase for any installation questions that may arise. Learn more on the Agile Products Support Membership Benefits Datasheet

  • Free software updates
  • One business day response times
  • Expert technical assistance
  • Major discounts on software workshops
  • Discounted professional development course
  • Annual balloting system for development planning
  • Annual Meetings
Turbomachinery Innovation Forum

Centrifugal Chiller Compressors

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Related Textbooks


Axial and Radial Turbines

Hany Moustapha, Mark F. Zelesky, Nicholas C. Baines, and David Japikse


The design basics presented in this textbook provide the analyst with a single source that is necessary to determine if a radial or axial turbine should be used to meet the design point conditions of the sCO2 system.


Centrifugal Compressor Design and Performance

David Japikse


This textbook provides a detail analysis of centrifugal compressors that are expected to be required for moderate to high pressure ratios (Pr=2.0 to 4.0) for sCO2 systems using the recompression cycle.

Compressor Surge and Stall

Ronald C. Pampreen

The parallel operation of two compressors used in a typical Recompression sCO2 cycle will require the mastery of the techniques described in this textbook to avoid surge and stall in compressors as well as to control the splitting of the flow between the two compressors.


Introduction to Turbomachinery

David Japikse and Nicholas C Baines
This textbook provides the best overall summary of the basic design aspects of turbines and compressors.  It is an essential “must read” for any engineer who is serious in not only understanding the turbomachinery designs required for sCO2 systems but for any thermodynamic cycle or process that uses turbomachinery.

Advanced Experimental Techniques in Turbomachinery

David Japikse, Editor
The experimental techniques presented in this textbook are relevant to the enhanced and sophisticated instrumentation and data collection that is needed to optimize the performance of the turbomachinery used in the advanced sCO2 system.