DocumentCode :
63532
Title :
Evacuated Tube Collectors - Influence of thermophysical properties in numerical simulations by CFD
Author :
De Cesaro Oliveski, Rejane ; Souza, Fabio Ricardo O. ; Krenzinger, Arno
Author_Institution :
Univ. do Vale do Rio dos Sinos (UNISINOS), Sáo Leopoldo, Brazil
Volume :
13
Issue :
1
fYear :
2015
fDate :
Jan. 2015
Firstpage :
129
Lastpage :
135
Abstract :
Solar liquid heating systems using evacuated tube collectors currently have a better performance than flat plate collectors for high temperature operation. This is due to reduced heat losses by convection, as a result of the vacuum layer over the inner tube. The solar collectors with vacuum tubes are a novelty in Brazil, in addition, its use on a commercial scale is less than 10 years and there are many questions to be answered about their use and efficiency. To get a better understanding of the operation of this equipment, it has started a program of study through a collaboration between the NETE - UNISINOS (Study Center Thermal and Energy of University of Vale do Rio dos Sinos) and LABSOL-UFRGS (Solar Energy Laboratory of Federal University of Rio Grande do Sul). The methodology consists in the numerical simulation by CFD (Computer Fluid Dynamics) and validate the methodology through numerical and experimental results. The results of velocity fields and mean temperature indicate that the methodology is quite adequate.
Keywords :
computational fluid dynamics; convection; heat losses; solar absorber-convertors; solar heating; vacuum tubes; Brazil; LABSOL-UFRGS; NETE-UNISINOS; Solar Energy Laboratory of Federal University of Rio Grande do Sul; Study Center Thermal and Energy of University of Vale do Rio dos Sinos; computer fluid dynamics; convection; evacuated tube collectors; heat loss; numerical simulations; solar collectors; solar liquid heating systems; thermophysical properties; vacuum layer; vacuum tubes; Adaptation models; Computational fluid dynamics; Computational modeling; Educational institutions; Electron tubes; Numerical simulation; Solar energy; CFD; Evacuated tube; Numerical Simulation; Solar Energy;
fLanguage :
English
Journal_Title :
Latin America Transactions, IEEE (Revista IEEE America Latina)
Publisher :
ieee
ISSN :
1548-0992
Type :
jour
DOI :
10.1109/TLA.2015.7040639
Filename :
7040639
Link To Document :
بازگشت