21
■ All-day hot water supply system
Centralized hot water supply system designed all-day hot water volume for where needs all-day hot
water supply, such as residence, villa, rest houses, training centers, guest rooms of hotels (excluding
staff dormitory), inpatient departments of the hospital, old people’s home, kindergartens, nurseries (with
accommodation) and other buildings:
G
r
’ — all-day hot water consumption amount (m
3
), (water temperature at 60ºC);
m — quantity for water consumption calculation (number of persons or number of beds);
q
r
— water use quota (L/person•day or L/bed•day), see Appendix I.
In formula (1), all-day hot water supply volume is calculated at water temperature of 60ºC according to
Appendix I (refer to "Code for Design of Building Water Supply and Drainage").
Calculate all-day hot water consumption amount based on the set water temperature of the storage tank:
G
r
— all-day hot water consumption amount (m
3
);
t — rated hot water temperature (ºC), t=60ºC in this case;
t
r
— water tank water temperature (ºC);
t
l
— local tap water temperature (ºC).
Designed hot water supply per hour:
G
h
— designed hot water supply amount per hour (m
3
/h);
K
h
— hour variation coefficient, see the table below;
T — hot water supply time (h), supply for 24h.
Hot water system hour variation coefficient K
h
:
Model Selection and Hydraulic Calculation
Water supply volume calculation
1000
r
r
mq
G
=
′
Formula (1)
Formula (2)
Formula (3)
l
r
l
r
r
t
t
t
t
G
G
−
−
′
=
T
K
G
G
h
r
h
=
Peak variation
coefficient k
Number of residents for residence and hotel; number of beds for hospital
35
50
60
75
100
150
200
250
300
450
500
600
900
1000
Residence
6.58
5.12
4.49
4.13
3.38
3.7
3.28
2.86
Hotel
9.65
6.84
5.61
4.97
4.58
4.19
Hospital
7.62
4.55
3.54
2.93
2.6
2.23
1.95
