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Careful Compressor Selection Improves Refrigeration System Efficiencies

In a regulatory environment where phase-down proposals for refrigerants containing HFCs are giving rise to a new class of refrigerant alternatives, retailers are faced with making decisions about how to design refrigeration systems. Our recent Making Sense webinar, entitled “Best Practices for Evaluating Compressor System Performance,” took a closer look at this issue to help retailers balance sustainability concerns within the contexts of evaluating operating costs, maintenance requirements and readiness of available technology.

From distributed DX rack systems that reduce refrigerant charge to cascading and transcritical booster CO2-based systems, today’s refrigeration systems are become increasingly complex in response to regulatory and consumer demands. Not only do these more complex systems reduce refrigerant charge, they also promise improved energy efficiencies and lower GWP potential. Choosing a compressor that meets these demanding requirements is a critical aspect of refrigeration system design.

Through Emerson Climate’s software-guided selection tools, we’re helping retailers make this important decision. When selecting a compressor that meets your application’s requirements, you must carefully evaluate factors that impact compressor performance:

  • Difference between mid-point and dew point
  • Compressor and evaporator capacity
  • Mechanical sub-cooling and vapor injection

Once retailers have a good idea of fundamental design conditions — from refrigerant choice and mid-point selection to minimum condensing temperature and liquid sub-cooling preferences — they can use our product selection software to recommend the best available compressor option.

As we explained in the webinar, we suggest the following best practices when selecting a compressor for your next refrigeration system:

  • Use mid-point, not dew point, as the basis of the decision, because that’s essentially what the refrigeration system is seeing.
  • To avoid oversizing your system, let evaporator capacity (rather than compressor capacity) inform the decision process. This provides a better reflection of how the system would operate.

At the end of the day, the primary goal retailers should keep in mind is to select a compressor capable of meeting the load at the highest ambient temperature while providing the best annual energy efficiency. To learn more about how to select the right compressor for your application, please visit our Making Sense website and listen to the archived webinar on demand.

Mike Saunders
Director, End User Technical Sales and Support
Emerson Climate Technologies

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