ETL 1110-3-489
3 April 98
(3) Solution:
(a) Peak Domestic Hot Water Demand:
90
Td
Vp = h occ
occupant Ts
2 occupants 90 L 43 C
Vp = (36heads)
occupant 60 C
head
Vp = 4644 L (1227 gal )
(b) Storage Tank Size:
2 occupants 50 L
St = (36 heads)
occupant
head
St = 3,600 L (951 gal)
Use 2 tanks of 1893 L (500 gal) each to fit into the available space.
(c) Recovery Rate:
60 sec
d = 9.5 min (2 occupants)
= 1140 sec (0.32 hours)
occupant
min
4644 L - 75% 2 each 1,893 L
R=
= 1.58 Lps (1505 gph)
1140 sec
(d) Flow rate for circulation pump (heat loss through piping is 0.629 kW):
0.629 kW
Qp =
= 0.0302 Lps (0.48 gpm)
kW ⋅ sec
5K
4.1679
L⋅K
7
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