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An experimental bench confronted with facts.

Un banc expérimental à l'épreuve des faits.

Author(s) : BOUTEILLER P., TOBALY P., TERRIER M. F., et al.

Type of article: Article

Summary

The efficiency of CO2 (R-744) heat pumps for domestic hot water production is well-known, but this technology shows rather low
performances when applied to central heating of buildings. Indeed, the efficiency of CO2 cycles is, among other parameters, linked to the gas cooler outlet temperature: the colder it is, the higher the coefficient of performance (COP). The return temperature of central heating circuits (30 to 60°C depending on the heat emitters) is not cold enough to fit the usual conditions for optimum CO2 transcritical cycle performance. This study deals with the modification of the characteristics of CO2 cycles, using CO2-based mixtures. The main objective is to obtain higher efficiency for central heating production, without degrading performances of domestic hot water generation. Adding other chemicals to CO2 refrigerant raises the critical point of the fluid, and generally the equilibrium lines also. This leads to modifications of the cycle which can be used in order to improve the efficiency of central heating as well as domestic hot water production. This article presents the facility established to study thermodynamic cycles using CO2 -based mixtures. The experimental bench has the particularity of analysing in-line fluid composition in several points of he cycle using infra-red spectrometry.

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Pages: 26-32

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Details

  • Original title: Un banc expérimental à l'épreuve des faits.
  • Record ID : 30018389
  • Languages: French
  • Source: Revue générale du Froid & du Conditionnement d'air - n. 1156
  • Publication date: 2016/03

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