MIL-HDBK-1003/19
properties ([rho]ck products of 7.5, 15, or 30, where 30 corresponds to the
high density concrete used in the reference designs of other system types).
The 21 combinations of these parameters used for both the vented and
unvented Trombe wall reference designs are presented in Appendix A.
Certain characteristics of the Trombe wall reference designs are fixed.
These fixed characteristics are listed in table VIII.
TABLE VIII.
Trombe wall reference design characteristics.
Optical Properties
Solar absorptance of wall surface (black)
0.95
Solar absorptance of selective surface
0.90
Infrared emittance of wall surface
0.90
Infrared emittance of selective surface
0.10
Thermocirculation vents
Total vent area (percent of wall area)
6
Vertical separation of vents (feet)
8
5.1.3.5 Water walls. The parameters varied in the water wall reference
designs are the thermal storage capacity or wall thickness (3, 6, 9, 12, 18,
or 24 inches), the number of glazings (1, 2, or 3), the optical properties
of the wall surface (flat black or selective), and the night insulation
(none or R-9). The optical properties for the flat black and selective
surface walls are the same as those specified for Trombe walls in table
VIII. system parameters for fifteen reference designs are presented in
Appendix A.
5.1.3.6 Concrete block walls. Eight reference designs for unvented
thermal storage walls constructed of 8-inch x 8-inch x 16-inch concrete
building blocks are provided in Appendix A. The concrete blocks used to
develop the correlations weighed about 25 pounds each and had two hollow
rectangular cores. The eight reference designs include single and double
glazed systems with and without mortar filling in the cores; the systems may
employ R-9 night insulation or none. The optical properties of the surface
are the same as for a flat black Trombe wall as specified in table VIII.
The concrete block wall reference designs include secondary thermal
storage mass in the floor. The floor is 4-inch thick high density concrete
and has an area three times the size of the glazed block wall. The massive
floor was included in the reference designs to more realistically represent
typical concrete block building construction.
5.1.3.7 Sunspaces. The principal sunspace glazing is assumed to face
due south. Thus, wall locations are referred to by the compass directions:
the principal glazing is the south wall, the principal common wall is the
north wall, and the end walls are the east and west walls.
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