MIL-HDBK-1003/13A
UA
Overall heat loss coefficient
of building times building
area (Btu/hr deg. F)
UL
Collector overall heat loss
coefficient (Langleys/deg. F-day)
V
Net space heat load = R x [eta]w
W
Weight of DHW to be
heated/day (lbm)
[alpha]
Absorptance
[epsilon]
Emittance
[epsilon]c
Effectiveness of the
collector-tank heat exchanger
[epsilon]L
Effectiveness of the space
heating load heat exchanger
[eta]
Collector efficiency
[eta]collect
Average collector efficiency
[eta]delivery
Delivery efficiency
[eta]w
Heater (DHW or space)
utilization efficiency
[theta]
Hours of useful sun/day
[(tau alpha)]
Product of cover transmittance
and plate absorptance account-
ing for dirt and shading
[(tau alpha)]
Average value of [(tau alpha)] over
one day
[(tau alpha)]n
[(tau alpha)] at normal radiation
incidence
[phi]
Utilizability (see 3.12)
Preparing Activity:
Navy - YD
Project FACR-0151
152
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