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Design & Selection
6 Selection of the Water Tank
6.1 Specifications of the Water Tank
SXVD200LCJ/A-K
SXVD300LCJ/A-K
SXVD200LCJ2/A-K
SXVD300LCJ2/A-K
SXVD200LCJ/A-M
SXVD300LCJ/A-M
SXVD200LCJ2/A-M
6�2 Volume Selection of the Water Tank
6.2.1 Selection Based on Water Consumption Per Capita
Building Type
House
Villa
6�2�2 Selection Based on Sanitary Utensils
Utensil Type
Bathtub, Sprinkler system (with shower)
Bathtub, Sprinkler system (without shower)
Shower
Wash Basin
6� 2�3 Selection of the Water Tank
Selection of the water tank should consider the flow rate of the shower head, duration of use per person
and daily water consumption.
Volume of the Water Tank=
t (design temperature): generally it is 60°C ;
t (entering cold water temperature): it differs for different regions.
t ( water tank temperature set point): it is the target heating temperature of the water tank
α: correction factor
Duration of Use
(min/Person)
Flow Rate of the Shower Head
(L/min)
4
6
8
10
15
Empirical values are worked out under conditions of 80L consumption (per day per person), 8L/min flow rate
of the shower head, and 10 minutes use duration per person.
7 Examples for Model Selection
7�1 General Introduction to the Example Project
For a two-floor house, there is a master room and a both room for each floor and both of
them require floor heating. Other rooms use the heat pump for heating in winter. The master
2
room covers 28m
and the both room covers 12m
220~240V-1Ph-50Hz
A single coil with the electric heater is integrated, used for floor heating system
220~240V-1Ph-50Hz
Dual coils with the electric heater are integrated, used for floor heating system and the solar system
380~415V-3Ph-50Hz
A single coil with the electric heater is integrated, used for floor heating system
380~415V-3Ph-50Hz
Dual coils with the electric heater are integrated, used for floor heating system and the solar system
Unit
Daily Water Consumption (L)
Per person, Per day
Per person, Per day
Consumption (L)
t(design temperatuere)-t(entering cold water temperatuere)
t(water tank temperatuere set point)-t(entering cold wa ter temperature)
Empirical Values for Volume Correction of the Water Tank
10
0.48
0.71
0.95
1.18
1.76
40~80
70~110
Daily Water
150
125
70~100
3
15
20
0.71
0.94
1.06
1.42
1.42
1.89
1.77
2.36
2.65
3.54
2
.
8
Water Temperature (°C)
60
60
Water Temperature (°C)
40
40
37~40
30
•consumption
25
30
1.18
1.42
1.77
2.12
2.36
2.83
2.95
3.54
4.42
5.31
40
1.89
2.83
3.77
4.72
7.08