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Integration of an expansion-compression unit for CO2 into a refrigeration system in the field.

Number: pap. ID: 533

Author(s) : GERBER R., WENZEL M.

Summary

Carbon dioxide is known to perform well as a refrigerant in applications like heat pump water heaters, mobile air conditioning and commercial refrigeration. The coefficient of performance in a transcritical CO2 cycle can be improved by minimizing the thermodynamic throttling losses with an expansion-compression unit. In this project, an expansion-compression-unit (ECU), based on a free piston design, was integrated into a CO2 refrigeration system to verify the practicability and the performance of the system in the field. The expansion-compression-unit was designed and dimensioned, machined and assembled. The integration of the machine into the refrigeration system required evaluation, design and assembling of additional components such as an intercooler, piping, valves and control components. A regulation scheme was developed and has successfully been implemented into the standard refrigeration controls. Technical challenges have been met in terms of lubrication, control strategy, dynamics and mechanics after commissioning the refrigeration plant and the ECU.

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Pages: 8 p.

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Details

  • Original title: Integration of an expansion-compression unit for CO2 into a refrigeration system in the field.
  • Record ID : 30001109
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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