4.2 Design of the storage tank
You can use the following table to calculate the approximate required volume of the buffer tank.
Temperature in buffer tank [°C]
HW temperature [°C] set on
controller
Reqd. Storage tank volume per
litre of HW [Litre]
50
45
1.3
60
45
0.8
50
1.0
55
1.4
70
45
0.7
50
0.8
55
0.9
80
45
0.5
50
0.6
55
0.7
Sample calculation for the design of the buffer tank:
Temperature of buffer tank: 50 °C, required dispensing medium flow rate at water valve: 20 l/min
DHW temperature set on the controller: 45 °C
How large must the Storage tank be if a 20-minute dispensing operation is to take place without reheating?
20 l/min x 20 min = 400 l
400 l x 1.3 = 520 l
ð
The heated part of the buffer tank must be 520 litres in size.
The required buffer volume for 1 litre of water
is calculated using the following formula:
V
P
V
W
P
V =
Bv: Required buffer volume
Vb: Volume of buffer
Vh: Volume of hot water
If there is a large temperature spread between the
buffer and the drinking water (e.g. 90-45):
0.5
If there is a medium temperature spread between
the buffer and the drinking water (e.g. 70-45):
0.7
If there is a low temperature spread between the
buffer and the drinking water (e.g. 55-45):
1.0
The hot water volume depends on the position
of the installed S 08 probe (Smart Control hot
water probe). The higher this is installed on the
buffer tank, the lower the hot water volume.
REMKO fresh water station
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