MIL-HDBK-1003/19
APPENDIX C
WORKSHEET 5
Weather Parameters
LOCATION
STATE:
______________________________________________
CITY:
______________________________________________
Annual heating degree days:
DDa = ________
FIRST SYSTEM
Number of glazings:
NGL = ________
Orientation:
[theta] = ________ degrees
Tilt:
[open phi] = ________ degrees
South-vertical radiation to degree day ratio:
(VTn/DD)o = ________ Btu/ft2-DD
South-vertical city parameter:
ao = ________
Coefficients for azimuth/tilt convection:
A1 = ________
A2 = ________
A3 = ________
A4 = ________
A5 = ________
B1 = ________
B2 = ________
B3 = ________
B4 = ________
B5 = ________
Corrected city parameter:
(Use equation 5.16)
a1 = ________
Corrected radiation to degree day ratio:
(Use equation 5.17)
(VTn/DD)1 = ________ Btu/ft2-DD
SECOND SYSTEM
Number of glazings:
NGL = ________
Orientation:
[theta] = ________ degrees
Tilt:
[open phi] = ________ degrees
South-vertical radiation to degree day ratio:
(VTn/DD)o = ________ Btu/ft2-DD
South-vertical city parameter:
ao = ________
Coefficients for azimuth/tilt convection:
A1 = ________
A2 = ________
A3 = ________
A4 = ________
A5 = ________
B1 = ________
B2 = ________
B3 = ________
B4 = ________
B5 = ________
Corrected city parameter:
(Use equation 5.16)
a1 = ________
Corrected radiation to degree day ratio:
(Use equation 5.17)
(VTn/DD)1 = ________ Btu/ft2-DD
MIXED WEATHER PARAMETERS
Radiation degree day ratio:
VTn/DD = f1(VTn/DD)1 + f2(VTn/DD)2 = ________ Btu/
City parameter:
a = f1a1 + f2a2 = ________
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