Ammonia screw compressor packs utilizing parallel operation of two or three smaller industrial NH3 screw compressors offer the optimum way to fulfill maximum part load efficiency, increased redundancy, and other highly desirable features in the industrial refrigeration industry. Optimized parallel operation can secure continuous operation and can in most applications be configured to improve overall operating economy. New compressors have been developed to meet requirements for flexibility in operation and have intelligent controls. The intelligent control system must focus on all external demands and strive to offer always the lowest possible absorbed power, including future scenarios with connection to smart grid. This paper builds on and includes most of the results of an earlier investigation to show how to implement a series of compressor packs following basically the results of these findings.
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