Skip to Main content Skip to Navigation

Etude expérimentale de cycles de pompe à chaleur utilisant des mélanges à base de CO2

Abstract : The aim of this work is to experiment CO2 based mixtures as working fluids for heat pump applications in buildings, in order to enhance their performances compared to pure CO2 dual services heat pumps. Since adding other chemicals to CO2 moves the critical point and generally equilibrium lines, it is expected that lower operating pressures as well as higher global efficiencies can be reached. A simple stage pure CO2 cycle is used as reference, with fixed external conditions. Two scenarios are considered: water is heated from 10 °C to 65 °C for Domestic Hot Water (DHW) scenario and from 30 °C to 35 °C for Central Heating (CH) scenario. In both cases, water at the evaporator inlet is set at 7 °C to account for such outdoor temperature conditions. In order to understand the dynamic behaviour of thermodynamic cycles with mixtures, it is essential to measure the fluid circulating composition. To this end, we have developed a non intrusive method. Online optical flow cells allow the recording of infrared spectra by means of a Fourier Transform Infra Red spectrometer. A careful calibration is performed by measuring a statistically significant number of spectra for samples of known composition. Then, a statistical model is constructed to relate spectra to compositions. After calibration, compositions are obtained by recording the spectrum in few seconds, thus allowing for a dynamic analysis. Mixtures of CO2 & propane and CO2 & R-1234yf have been tested and showed great potential on enhancing performances of the heat pump for central heating applications.
Complete list of metadatas

Cited literature [57 references]  Display  Hide  Download
Contributor : Abes Star :  Contact
Submitted on : Wednesday, September 6, 2017 - 7:28:07 PM
Last modification on : Wednesday, March 20, 2019 - 4:52:15 PM


Version validated by the jury (STAR)


  • HAL Id : tel-01583171, version 1



Paul Bouteiller. Etude expérimentale de cycles de pompe à chaleur utilisant des mélanges à base de CO2. Thermique [physics.class-ph]. Conservatoire national des arts et metiers - CNAM, 2017. Français. ⟨NNT : 2017CNAM1089⟩. ⟨tel-01583171⟩



Record views


Files downloads