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10.
4.
2.
1 Maximum daily water consumption of the system
The maximum daily water consumption Qa (L/d) of the system can be calculated as follows:
Q d =Nq d
In the formula, N is the number of people served by the system, person; gd is the water quota, L/(d·person)
.
The water supply quota for the quality of the pipeline: 5L/(d·person) for residential buildings, 7～85L/(d·person) in economically developed areas; 2～3L/(d·person) for office buildings
.
10.
4.
2.
2 Maximum water consumption of the system
(1) The water consumption Qh (L/h) at the maximum time of the system can be calculated as follows:
Q h =k h Q d /T
In the formula, k h is the coefficient of time change, which is taken according to Table 10-1; T is the use time of direct drinking water in the system, and h is taken according to Table 10-1
.
Table 10-1 System change coefficient and use time when drinking water
(2) Probability of tap use The probability P of tap use can be calculated as follows:
P=aQ h /(1800nq 0 )
In the formula, a is the empirical coefficient, 0.
6～0.
9; n is the number of faucets; q 0 is the rated flow of the faucets, L/s
(3) The number of taps used during the instantaneous peak water consumption, m, can be calculated as follows:
In the formula, Pn is the probability of not more than m taps being used simultaneously; P is the probability of taps being used; k is an intermediate variable
When the number of faucets is small, the empirical value shown in Table 10-2 should be used
Table 10-2 The experience value of the number of faucets used during the instantaneous peak
(4) Instantaneous peak water consumption The instantaneous peak water consumption q s (L/s) can be calculated as follows:
q s = q 0 m
(5) The circulating flow rate q x (L/h) of the circulating flow system can be calculated as follows:
q x =V/T 1
In the formula, V is the total volume of the water supply system, L; T 1 is the allowable water retention time of the pipe-quality water supply system, h, generally 6h
Related Links: Design Principles of Pipeline Water Supply Network System
