MIL-HDBK-1003/19
APPENDIX D
WORKSHEET 10
Annual Incremental Cooling Load
ANNUAL HEAT TO LOAD RATIO
(Use Worksheets 4, 5, and 6
QA
with Tset = Tmax - 10)
=
0.37
QL
a
ANNUAL AUXILIARY HEAT REQUIRED
(From Worksheet 6 with Tset = Tmax - 10)
QA =
32.6 x 10
QA
ANNUAL SOLAR HEATING FRACTION
SHFa = 1 -
=
0.63
QL
a
ANNUAL UTILIZATION EFFICIENCY
(eu)a =
[TLCe [multiplied by] SHFa + (24 Uc - G) Ac] [multiplied by] DDa
=
0.
(QD)a
Note:
Use:
TLCe from Worksheet 7
Uc, G, and Ac from Worksheet 3
DDa from Worksheet 5
(QD)a from Worksheet 9
ACTUAL INDOOR TEMPERATURE (ANNUAL AVERAGE)
(Use:
Tset = Tmax - 10)
Tact = Tset + 10 SHFa [multiplied by] (1 - eu)0.2 =
75.8 d
ACTUAL ANNUAL DEGREE DAYS
(Use Worksheet No. 4 with
DDact =
3,827
d
Tset = Tact to determine Tb)
ACTUAL ANNUAL HEAT LOAD
Qact = (NLC + 24 Uc [multiplied by] Ac) [multiplied by] DDact =
133.5 x 1
INCREMENTAL COOLING LOAD
Q1 = QD + QA - Qact =
76.5 x 10
184
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