UFC 3-420-01
25 October 2004
(3) Solution:
(a) Peak Domestic Hot Water Demand:
T d
V p = (h)(occ)(P)
T s
2occupants 90L 43C
occupant 60C
V p
= (36heads)
head
V
= 4644L(1227 gal )
p
(b) Storage Tank Size:
2occupants 50L
occupant
St
= (36heads)
head
S
= 3600L(951gal )
t
Use 2 tanks of 1893 L (500.0 gal) each to fit into the available
space.
(c) Recovery Rate:
9.5 min
60 sec
(2occupants)
d=
= 1140 sec
occupant
min
4644L - (75% x2eachx1893L)
R=
= 1.58 Lps (1505 gph)
1140 sec
E-8
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