UFC 3-420-01
25 October 2004
Td =43C (110F)
TS = 60C (140F)
M = 75% useable tank capacity
∆T = 5K (9F) Maximum temperature drop through distribution system.
∆Tt= 54K (97F)
Piping system consists of:
9 meters of 50 mm pipe
6 meters of 25 mm pipe
15 meters of 20 mm pipe
A separate tank and hot water boiler will be used.
qpipe = 0.10 kW = 341.18 BTUH
(2) Find:
(a) Peak domestic hot water demand, L
(gal).
(b) Storage tank size, L (gal).
(c) Recovery rate required given the tank size selected, Lps
(gph).
(d) Flow rate required for domestic hot water circulation
pump.
(e) Flow rate required for boiler circulation pump.
E-7
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