| Titre : | Water-coupled carbon dioxide microchannel gas cooler for heat pump water heaters. Part II – Model development and validation (2011) |
| Titre original : | Refroidisseur de gaz à microcanaux sur eau souterraine pour des pompes à chaleur au dioxyde de carbone utilisées pour chauffer de l'eau sanitaire. Partie II – Développement et validation du modèle |
| Auteurs : | Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | International journal of refrigeration (Vol. 34 N° 1, Janvier 2011) |
| Article en page(s) : | pp. 17-28 |
| Note générale : | Génie Mécanique |
| Langues : | Anglais |
| Index. décimale : | 621.5 (Energie pneumatique. Machinerie et outils. Réfrigération) |
| Tags : | Heat exchanger Gas cooler Carbon dioxide Transcritical cycle Microchannel pump Heating Hot water Modelling Simulation |
| Résumé : | An experimental and analytical study on the performance of a compact, microchannel water-carbon dioxide (CO2) gas cooler was conducted. The experimental results addressed in Part I of this study are used here in Part II to develop an analytical model, utilizing a segmented approach to account for the steep gradients in the thermodynamic and transport properties of supercritical CO2. The model predicted gas cooler heat duty with an average absolute deviation of 7.5% with varying refrigerant and water inlet conditions. The segmented model reveals that near the pseudo-critical point, there is a significant local decrease in refrigerant-side thermal resistance, which yields a sharp increase in local heat duty. The impact of this spike on gas cooler performance is analyzed. Results from this study can be used to predict the effect of changing geometric parameters of the heat exchanger without the need for expensive prototype development and testing. |
| DEWEY : | 621.5 |
| ISSN : | 0140-7007 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S014070071000109X |
