Natural convective flow and heat transfer in a collector with an immersed heat exchanger: Numerical study
Su Y.; Davidson J.H.
Source PublicationInternational Solar Energy Conference
AbstractA three-dimensional model and dimensionless scale analysis of the transient fluid dynamics and heat transfer in an inclined adiabatic water-filled enclosure with an immersed cylindrical cold sink is presented. The geometry represents an integral collector storage system with an immersed heat exchanger. The modeled enclosure has an aspect ratio of 6:1 and is inclined at 30 degrees to the horizontal. The heat exchanger is represented by a constant surface temperature horizontal cylinder positioned near the top of the enclosure. A scale analysis of the transient heat transfer process identifies four temporal periods: conduction, quasi-steady, fluctuating and decay. It also provides general formulations for the transient Nusselt number, and volume averaged water temperature in the enclosure. Insight to the transient fluid and thermal processes is provided by presentation of instantaneous flow streamlines and isotherm contours during each transient period. The flow field consists of two distinct zones. The zone above the cold sink is nearly stagnant. The larger zone below the sink is one of strong mixing and recirculation initiated by the cold plume formed in the boundary layer of the cylindrical sink. Correlations predicted with the model for the transient Nusselt number and the dimensionless volume averaged tank temperature expressed in terms of the initial Rayleigh number compare favorably to prior measured data. Copyright © 2005 by ASME.
KeywordHeat exchanger Integral collector storage Natural convection Solar
URLView the original
Fulltext Access
Citation statistics
Document TypeConference paper
CollectionUniversity of Macau
AffiliationUniversity of Minnesota Twin Cities
Recommended Citation
GB/T 7714
Su Y.,Davidson J.H.. Natural convective flow and heat transfer in a collector with an immersed heat exchanger: Numerical study[C],2005:165-174.
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Su Y.]'s Articles
[Davidson J.H.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Su Y.]'s Articles
[Davidson J.H.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Su Y.]'s Articles
[Davidson J.H.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.