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Optimisation of the throttling system in a CO2 refrigerating machine.

Author(s) : CASSON V., CECCHINATO L., CORRADI M., et al.

Type of article: Article, IJR article

Summary

This article providres an answer to the need to find an optimal solution for the throttling system in refrigerating machines using CO2 as working fluid; such a solution must combine reliability, low installation cost and high energy efficiency. To this purpose, different expansion systems are compared by means of a simulation programme, including a new one, operating with a differential valve, a liquid receiver and a thermostatic valve. The typical compression refrigerating cycle performed by CO2 involves transcritical operations and therefore the upper pressure needs to be adjusted to the optimal value, that, unlike the traditional cycle, is not determined by heat transfer. The innovative system here proposed shows an intrinsic self-adjusting capability that leads to COP values quite close to the maximum ones when a fixed suitable value of the differential pressure is chosen, even if the temperature of the secondary fluid varies to a large extent.

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Format PDF

Pages: 926-935

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Details

  • Original title: Optimisation of the throttling system in a CO2 refrigerating machine.
  • Record ID : 2004-0612
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 8
  • Publication date: 2003/12

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