Parameters that control heat transfer and mixing in energy extraction from indirect solar storage tanks that employ an immersed heat exchanger with a straight baffle beneath are identified and estimated. The analysis of flow in the baffle is based on boundary layer theory and provides insight into the effectiveness of a baffle in controlling growth of the thermal plume from the heat exchanger. The important physical mechanisms are the restricted entrainment and heat transfer to the storage fluid. For an adiabatic baffle as a base case, key design factors are the point of attachment of the plume on the baffle and the width of the baffle relative to that of the heat exchanger.
Issue Section:
Technical Briefs
1.
Arora
, S.
, Davidson
, J.
, Burch
, J.
, and Mantell
, S.
, 2001, “Thermal Penalty of an Immersed Heat Exchanger in Integral Collector Storage Systems
,” ASME J. Sol. Energy Eng.
0199-6231, 123
, pp. 180
–186
.2.
Davidson
, J. H.
, Mantell
, S. C.
, and Jorgensen
, G.
, 2002, “Status of the Development of Polymeric Solar Water Heating Systems
,” Advances in Solar Energy
, Goswami
, D. Y.
, ed., American Solar Energy Society
, Boulder
, Vol. 15
, pp. 149
–186
.3.
Bourne
, D.
, Lee
, E.
, Callaway
, D.
, and Plaisted
, J.
, 2003, “Design and Development of a Low Cost ICS Solar Water Heater
,” Solar 2003, Proc. of 32nd American Solar Energy Society Annual Conference
, Campbell-Howe
, R.
, ed., American Solar Energy Society
, Boulder
, pp. 55
–60
. 4.
Bourne
, D.
, Callaway
, D.
, Dwiggins
, H.
, and Lee
, E.
, 2004, “Durability Testing of a Low Cost ICS Solar Water Heater
,” Solar 2004, Proc. of 33rd American Solar Energy Society Annual Conference
, Campbell-Howe
, R.
, ed., American Solar Energy Society
, Boulder
, pp. 381
–386
.5.
Streicher
, W.
, and Bales
, C.
, 2005, “Combistores
,” Thermal Energy Storage for Solar and Low Energy Buildings
, Hadorn
, J.-C.
, ed., International Energy Agency
, Paris
, Task 32, pp. 29
–40
, www.iea-shc.orgwww.iea-shc.org6.
Liu
, W.
, Davidson
, J. H.
, Kulacki
, F. A.
, and Mantell
, S. C.
, 2003, “Natural Convection From a Horizontal Tube Heat Exchanger Immersed in a Tilted Enclosure
,” ASME J. Sol. Energy Eng.
0199-6231, 125
, pp. 67
–75
.7.
Liu
, W.
, Davidson
, J. H.
, and Kulacki
, F. A.
, 2004, “Natural Convection From a Tube Bundle in a Thin Inclined Enclosure
,” ASME J. Sol. Energy Eng.
0199-6231, 126
, pp. 702
–709
.8.
Liu
, W.
, Davidson
, J. H.
, and Kulacki
, F. A.
, 2005, “Thermal Characterization of Prototypical ICS Systems With Immersed Heat Exchangers
,” ASME J. Sol. Energy Eng.
0199-6231, 127
, pp. 21
–28
.9.
Su
, Y.
, and Davidson
, J. H.
, 2005, “Natural Convective Flow and Heat Transfer in a Collector Storage With an Immersed Heat Exchanger: Numerical Study
,” ASME J. Sol. Energy Eng.
0199-6231, 127
, pp. 324
–332
.10.
Mather
, D.
, Hollands
, K. G. T.
, and Wright
, J. L.
, 2002, “Single- and Multi-Tank Energy Storage for Solar Heating Systems: Fundamentals
,” Sol. Energy
0038-092X, 73
(1
), pp. 3
–13
.11.
Ragoonanan
, V.
, Davidson
, J. H.
, Homan
, K. O.
, and Mantell
, S. C.
, 2005, “The Benefit of Dividing an Indirect Thermal Storage into Two Compartments: Discharge Experiments
,” Sol. Energy
0038-092X, 80
(1
), pp. 18
–31
.12.
Andersen
, E.
, Shah
, L. J.
, and Furbo
, S.
, 2004, “Thermal Performance of Danish Solar Combi Systems in Practice and in Theory
,” ASME J. Sol. Energy Eng.
0199-6231, 126
, pp. 744
–749
.13.
Drück
, H.
, 2002, “Influence of Different Combistore Concepts on the Overall System Performance
,” IEA-SHC Task 26, Industry Workshop, Oslo, pp. 39
–46
.14.
Drück
, H.
, and Bachmann
, S.
, 2002, “Hot Water Performance of Solar Combistores-Description of a Test Method and the Experience Gained with the Application of the Method on Three Different Types of Combistores
,” IEA-SHC Task 26 Report, Combisystems, Nov.15.
Chauvet
, L. P.
, Nevrala
, D. J.
, and Probert
, S. D.
, 1993, “Influences of Baffles on the Rate of Heat Recovery via a Finned-Tube Heat-Exchanger Immersed in a Hot-Water Store
,” Appl. Energy
0306-2619, 45
, pp. 191
–217
.16.
Jordan
, U.
, and Vajen
, K.
, 2002, “Influence of the DHW Load Profile on the Fractional Energy Savings: A Case Study of a Solar Combi-System With TRNSYS Simulations
,” Sol. Energy
0038-092X, 73
, pp. 33
–42
.17.
Mote
, R.
, Probert
, S. D.
, and Nevrala
, D.
, 1992, “Rate of Heat Recovery From a Hot-Water Store: Influence of the Aspect Ratio of a Vertical-Axis Open-Ended Cylinder Beneath a Submerged Heat-Exchanger
,” Appl. Energy
0306-2619, 41
, pp. 115
–136
.18.
Feiereisen
, T. J.
, Klein
, S. A.
, Duffie
, J. A.
, and Beckman
, W. A.
, 1982, “Heat Transfer From Immersed Coils
,” ASME Winter Annual Meeting, ASME, New York, ASME Paper No. 82-WA∕SOL-18.19.
Eckert
, E. R. G.
, and Drake
, R. M.
, 1972, Analysis of Heat and Mass Transfer
, McGraw-Hill
, New York
, p. 408
.20.
Morgan
, V. T.
, 1975, “The Overall Convective Heat Transfer From Smooth Circular Cylinders
,” Advances in Heat Transfer
, Irvine
, T. R.
, and Hartnett
, J. P.
, eds., Academic Press
, New York
, Vol. 11
, pp. 199
–264
.21.
Eckert
, E. R. G.
, and Gross
, J.
, 1963, Introduction to Heat and Mass Transfer
, McGraw-Hill
, New York
, pp. 186
–194
.22.
Jaluria
, Y.
, 1980, Natural Convection Heat and Mass Transfer
, Pergamon Press
, New York
, pp. 102
–115
.23.
Gebhart
, B.
, Pera
, L.
, and Schorr
, A. W.
, 1970, “Steady Laminar Convection Plumes Above a Horizontal Line Heat Source
,” Int. J. Heat Mass Transfer
0017-9310, 13
, p. 161
–168
.24.
Wirtz
, R. A.
, and Chiu
, C. M.
, 1974, “Laminar Thermal Plume Rise in a Thermal Stratified Environment
,” Int. J. Heat Mass Transfer
0017-9310, 17
, pp. 323
–329
.25.
Morton
, B. R.
, 1967, “Entrainment Models for Laminar Jets, Plumes, and Wakes
,” Phys. Fluids
0031-9171, 10
, pp. 2120
–2127
.Copyright © 2007
by American Society of Mechanical Engineers
You do not currently have access to this content.
