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Forschungsstelle
BFE
Projektnummer
101582
Projekttitel
Stockage de froid par fluide diphasique

Texte zu diesem Projekt
 DeutschFranzösischItalienischEnglisch
Schlüsselwörter
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Kurzbeschreibung
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Publikationen / Ergebnisse
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Schlussbericht
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Erfasste Texte


KategorieText
Schlüsselwörter
(Deutsch)
TP0072;F - Solarwärme u. Wärmespeicherung
Kurzbeschreibung
(Deutsch)
Les dangers de l'impact des fluides frigorigènes synthétiques sur
l'environnement ainsi que les importantes mesures de sécurité, poussent l'industrie du froid à rechercher et à s'engager sur de nouvelles voies permettant de supprimer certains gaz ou d'en diminuer les quantités
dans les installations. Une des solutions est l'utilisation du "coulis dyphasique " comme fluide caloporteur (technologie du refroidissement indirect).
Publikationen / Ergebnisse
(Englisch)
The apparent viscosity and flow regime of CO2 hydrate slurry were investigated with a XL7-100 on-line resonant viscometer. Possible reasons for the viscosity changes before and after the nucleation of hydrates are discussed. In addition, super saturation of the CO2 solution under certain pressure and temperature conditions as well as its density and apparent viscosity were examined. The hydrate’s solid fraction and the dissociation enthalpy were evaluated by an on-line Micro DSC system. Real-time coupled multi-electrode array sensor (CMAS) probes were applied to measure the maximal localized corrosion rate of three different materials subjected to CO2 hydrate slurry and saturated CO2 solution in the temperature range of 1 to 18 °C and pressure range of 25 to 30 bar. The density of CO2 hydrate slurry was also experimentally investigated and the relation between the density and the solid fraction has been established.

Auftragnehmer/Contractant/Contraente/Contractor:
Nestec

Autorschaft/Auteurs/Autori/Authors:
Sari,Osmann
Hu,Jin
Eicher,Sarah
Egolf,Peter W.
Homsy,Paul
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Publikationen / Ergebnisse
(Französisch)
L’Institut de génie thermique d’Yverdon-les-Bains, en partenariat avec Axima Réfrigération et Nestlé, a mis au point un nouveau fluide frigoporteur très prometteur, notamment pour la climatisation : le coulis de glace et d’hydrates de CO2. Explications

Auftragnehmer/Contractant/Contraente/Contractor:


Autorschaft/Auteurs/Autori/Authors:
Sari,Osmann
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Schlussbericht
(Englisch)
In the present report, 2 large-scale continuous CO2 hydrate formation-dissociation conditions were experimentally investigated on a fully functional laboratory demonstrator for industrial applications. The solid fraction of CO2 hydrate slurry was evaluated by a numerical approach based on a CO2 mass balance. A first CO2 hydrate slurry production system with compressor was tested. In this system the CO2 hydrate slurry formation and dissociation pressure, temperature, density and dynamic viscosity were measured. The consumption of CO2 hydrate slurry in the consumer installed in the climate room was successful;. The continuous formation and dissociation processes in this loop were not very successful. A second experimental loop for hydrate production without compressor was completed. The new test rig is an industrial prototype approach. The new test rig is simple, easy to be modified and adapted to new devices. Axima heat exchanger was modified and is being used for hydrate slurry production. Kenics mixing elements and Sulzer SMV gas mixers were tested in the loop. Experimental results showed that the mixing elements and gas mixers can promote hydrate formation. CO2 hydrate slurry density was measured with a value of 1032 kg/m3 which corresponds to over 30% solid fraction (150 kJ/kg dissociation enthalpy of water). Power of the pump was tested and it was showed that it is not sufficient to pump CO2 hydrate slurry when density is over 1030 kg /m3; The Cp of water and of ice, the enthalpy of ice and of CO2 hydrates were obtained using a differential scanning calorimetry, Micro DSCVII. It confirmed that CO2 dissolved in water depresses the freezing point of water. On-line measurements of corrosion rates were performed and reliable results obtained.

Auftragnehmer/Contractant/Contraente/Contractor:


Autorschaft/Auteurs/Autori/Authors:
Hu,Jin
Sari,Osmann
Brun,Frederic
Eicher,Sarah
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