Natural convection, radiation and conduction heat transfer in passive solar massive wall systems with fins attached to the heated surface and without glazing is experimentally studied. The system was 0.78 m high, 0.40 m wide, and 0.10 m thick concrete wall with 0.025 m long, 0.004 m thick horizontal fins made as an integral part of it and placed at 0.01 m intervals. A heat source was used to impose a constant heat flux which could be varied from about 200 to 800 W/m2. Temperatures at various points and heat flux by convection at the back were measured. Using periodicity hypothesis and various assumptions, the wall with fins was also analyzed theoretically. The results indicate that for the case considered, about 35 percent of the heat flux imposed on the finned surface goes through the system and is dissipated at the back. [S0199-6231(00)00701-2]

Issue Section:
Technical Papers
Keywords:
solar heating, natural convection, radiative transfer, heat conduction, ventilation, passive solar buildings
Topics:
Convection, Fins, Heat, Heat conduction, Heat flux, Heat transfer, Natural convection, Radiation (Physics), Solar energy, Temperature, Wall systems, Cavities
1.
Bilgen, E., and Michel, J., 1979, “Integration of Solar Systems in Architectural and Urban Design,” in Solar Energy Application in Buildings, ed. A. A. Sayigh, Chap. 9, Academic Press, New York.
2.
Zrikem
,
Z.
, and
Bilgen
,
E.
,
1986
, “
Theoretical Study of a Non-Convective Trombe Wall Collector With Honeycomb Structure
,”
J. Solar Wind Technol.
,
3
, pp.
33
–
44
.
3.
Hasnaoui
,
M.
,
Zrikem
,
Z.
,
Vasseur
,
P.
, and
Bilgen
,
E.
,
1990
, “
Radiation Induced Natural Convection in Enclosures with Conducting Walls
,”
J. Solar Wind Technol.
,
7
, No.
5
, pp.
515
–
525
.
4.
Hasnaoui
,
M.
,
Vasseur
,
P.
, and
Bilgen
,
E.
,
1992
, “
Natural Convection in Rectangular Enclosures With Adiabatic Fins Attached on the Heated Wall
,”
Wa¨rme und Stoffu¨bertragung
,
27
, pp.
357
–
368
.
5.
Lakhal
,
E. K.
,
Bilgen
,
E.
, and
Vasseur
,
P.
,
1995
, “
Natural Convection and Conduction in Massive Wall Solar Collectors With Honeycomb and Without Vents
,”
ASME J. Sol. Energy Eng.
,
117
, pp.
173
–
180
.
6.
Penot
,
F.
,
1982
, “
Numerical Calculation of Two-Dimensional Natural Convection in Isothermal Open Cavities
,”
Numer. Heat Transf.
,
5
, pp.
421
–
437
.
7.
Chan
,
Y. L.
, and
Tien
,
C. L.
,
1985
, “
A Numerical Study of Two-Dimensional Natural Convection in Square Open Cavities
,”
Numer. Heat Transf.
,
8
, pp.
65
–
80
.
8.
Kenny
,
S. P.
, and
Davidson
,
J. H.
,
1994
, “
Design of a Multiple-Lamp Large-Scale Solar Simulator
,”
ASME J. Sol. Energy Eng.
,
116
, pp.
200
–
205
.
9.
Siegel, R., and Howell, J. R., 1981, Thermal Radiation Heat Transfer, McGraw-Hill, New York.
10.
Churchill
,
S. W.
, and
Chu
,
H. H. S.
,
1975
, “
Correlating Equations for Laminar and Turbulent Free Convection From a Vertical Plate
,”
Int. J. Heat Mass Transf.
,
18
, pp.
1323
–
1329
.
Copyright © 2000
 by ASME
You do not currently have access to this content.