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New capacity control algorithm for large systems with fixed capacity ejectors.

Number: 0013

Author(s) : KRIEZI E., SEVER M., WERNER M., PRINS J.

Summary

Fixed capacity ejectors for CO2 system have been used in several applications.  A single fixed capacity ejector cannot control the system capacity in off design conditions, so a common solution is to utilise an array of different sizes of ejectors and control the system capacity by steps. This method is used in the Danfoss Multi Ejector Solution™. The step control concept fits in common food retail application with a design capacity less than 300 kW. However, in large industrial system or heat pump applications larger than 1 MW, the step control will result in a large number of ejectors, which is not optimal for implementation. Hence, a combination of a high-pressure valve or a variable capacity ejector unit in parallel with an array of large capacity ejectors can be used instead. In this paper a new algorithm to control and distribute the flow between ejectors and high-pressure valve is presented and validated with experimental data.

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Pages: 8

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Details

  • Original title: New capacity control algorithm for large systems with fixed capacity ejectors.
  • Record ID : 30030972
  • Languages: English
  • Subject: Technology
  • Source: 10th IIR Conference on Ammonia and CO2 Refrigeration Technologies.
  • Publication date: 2023/04/27
  • DOI: http://dx.doi.org/10.18462/iir.nh3-co2.2023.0013

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