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MIL-HDBK-1003/13A
7.0 LIST OF SYMBOLS
Ac
Collector area (ft2)
CF
Cost of fuel ($/106 Btu)
Cmin
Lesser of the heat capacity
flow rates in the space
heating load exchanger
COP
Coefficient of performance
Cp
Specific heat of fluid
(Btu/lbm deg. F)
f
Fraction of building load
supplied by solar heating
_
f
Average of f over one year
FI
Function of energy absorbed
by collector/building heating
load (ft -2)
FL
Function of collector heat
losses/building heating load (ft -2)
FR
Collector heat removal factor
(see 3.2)
F'R
Collector heat exchanger
efficiency factor (see 3.2)
G
Flow rate through collector
per unit area (lbm/hr ft2)
I
Solar insolation
(Btu/ft2-day)
IT
Average instantaneous solar
insolation on collector
surface
L
Gross heat loss rate
(Btu/ft2-degree day)
M
Area of building (ft2)
.
m
Mass flow through collector
(lbm/hr)
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