MIL-HDBK-l003/19
APPENDIX D
WORKSHEET 5
Weather Parameters
VIRGINIA
STATE :
LOCATION
NORFOLK
CITY :
DDa =
2,778
Annual heating degree days:
FIRST SYSTEM
NGL =
2
Number of glazings:
degrees
θ =
15
Orientation:
ϕ=
degrees
o
Tilt:
2
(VTn/DD)1 =
27.60
Btu/ft -D
South-vertical radiation to degree day ratio:
0.637
a
South-vertical city parameter:
=
0
Coefficients for azimuthl/tilt convection:
-0,2437
-0.0848 AS =
A4 =
0.3078
-0.1572 A2 = -0.4382 A3 =
Al =
-1.159
B4 =
1.054 B5 =
0.3319
B1 =
0,0885 B2 = -0.7389 B3 =
Corrected city parameter:
0,616
al =
(Use equation 5.16)
Corrected radiation to degree day ratio:
2
Btu/ft -D
(VTn/DD)l =
27.51
(Use equation 5.17)
SECOND SYSTEM
NGL =
Number of glazings:
θ
degrees
Orientation:
=
ϕ=
degrees
Tilt:
2
Btu/ft -D
(VTn/DD)1=
South-vertical radiation to degree day ratio:
=
a
South-vertical city parameter:
o
Coefficients for azimuth/tilt convection:
A3 =
A5=
A4 =
A2 =
A1 =
B4 =
B5 =
B1 =
B3 =
B2 =
Corrected city parameter:
=
a l
(Use equation 5.16)
Corrected radiation to degree day ratio:
2
Btu/ft -D
(VTn/DD)l =
(Use equation 5.17)
MIXED WEATHER PARAMETERS
Radiation degree day ratio:
2
Btu/ft -D
VTn/DD = fl(VTn/DD)l + f2(VTn/DD) 2 =
a = f1a1 + f2a2 =
City parameter:
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