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Energy-optimal speed control of fans and compressors in a refrigeration system.

Author(s) : JAKOBSEN A., RASMUSSEN B. D.

Summary

Use of variable speed compressors and variable speed fans for both the evaporator and the condenser make the refrigeration system more flexible, add to the degree of freedom of the control system and therefore make it possible to (on-line) optimize the various speeds involved. For example, the cooling capacity must be increased due to increased cooling load. This can be done by increasing the compressor speed and/or the evaporator fan speed and also to some extent by increasing the condenser fan speed. The general control problem is to obtain the desired temperature of the cooled air, while choosing the combination of compressor speed, evaporator fan and condenser fan speeds which minimises the total power consumption of the motors involved. A system and integrated control viewpoint is necessary as a "component-oriented" and "single-loop-control" approach will not lead to the discovery and therefore the achievement of the potential for energy saving. This control/optimization problem is investigated using a steady-state simulation model.

Details

  • Original title: Energy-optimal speed control of fans and compressors in a refrigeration system.
  • Record ID : 1999-3460
  • Languages: English
  • Source: Thermodynamics, heat and mass transfer of refrigeration machines and heat pumps. Proceedings of the EUROTHERM Seminar 59./ Thermodynamique et transferts de chaleur et de masse dans les machines à froid et pompes à chaleur. Comptes rendus du séminaire EUROTHERM 59.
  • Publication date: 1998/07/06
  • Document available for consultation in the library of the IIR headquarters only.

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