MIL-HDBK-l003/19
APPENDIX D
WORKSHEET 3
System Parameters
THERMAL STORAGE
EHC/Ac =
Effective heat capacity:
(Direct gain or radiant heat panel only)
2
2
56.96 Btu/F-ft
DHC/A c =
Diurnal heat capacity per ft of aperture:
FIRST SYSTEM
Direct gain
System type:
.
6442
System number:
0.966
Scale factor:
=
F 1
2
4.42
Btu/F-ft -day
Effective aperture conductance (daily):
=
F 1
2
Btu/F-ft -hr
0.35
u
Steady-state aperture conductance (hourly):
=
cl
0.97
System solar absorptance:
=
al
2
791
ft
Collection aperture area:
A
=
cl
SECOND SYSTEM
System type:
System number:
Scale factor:
F2 =
Btu/F-ft2-day
Effective aperture conductance (daily):
G2 =
Btu/F-ft2-hr
u
Steady-state aperture conductance (hourly):
=
C2
System solar absorptance:
=
a
2
1
2
ft
A
Collection aperture area:
=
c2
= Acl/(Acl + AC2)
FIRST SYSTEM AREA FRACTION
f1
f2 = Ac2/(Acl + AC2)
SECOND SYSTEM AREA FRACTION
MIXED SYSTEM PARAMETERS
Scale factor;
F = ( fl Z Fl )+
(f2 F2 )
=
Effective aperture
2
Btu/F-ft -day
G = (fl
Gl ) + ( f2 Z
G
conductance (daily):
Steady-state aperture U =(f Z U )+
2
Btu/F-ft -hr
f2 Uc2 ) =
conductance(hourly): c
1
cl
System solar absorptance: a = (fl a1) + (f2 Z a2) =
f t2
Collection
aperture
area:
Ac = Acl+ Ac2=
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