Model Selection And Hydraulic Calculation - Daikin UHA075B5 Catalogue/Engineering Data

Model Selection and Hydraulic Calculation

Water supply volume calculation
■ 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 ' — all-day hot water consumption amount (m
r
m — quantity for water consumption calculation (number of persons or number of beds);
q — water use quota (L/person•day or L/bed•day), see Appendix I.
r
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 — all-day hot water consumption amount (m
r
t — rated hot water temperature (ºC), t=60ºC in this case;
t — water tank water temperature (ºC);
r
t — local tap water temperature (ºC).
l
Designed hot water supply per hour:
G — designed hot water supply amount per hour (m
h
K — hour variation coefficient, see the table below;
h
T — hot water supply time (h), supply for 24h.
Hot water system hour variation coefficient K
Peak variation
coefficient k
35 50
Residence 6.58
Hotel
Hospital 7.62 4.55
m q
'
G
= r
Formula (1)
r
1000
3
), (water temperature at 60ºC);
t − t
'
G = G l
r r
t − t
r l
3
);
K
G = G h
Formula (3)
h r
T
:
h
Number of residents for residence and hotel; number of beds for hospital
60 75 100 150
5.12 4.49
9.65 6.84
3.54
Formula (2)
3
/h);
200 250 300
4.13 3.38 3.7
5.61
2.93 2.6
450 500 600 900
3.28
4.97 4.58 4.19
2.23
1000
2.86
1.95
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