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7 Commissioning [specialist]
18
996404631-mub-en - V02
2015/12
7.3
Maximum withdrawal flow rate
The following diagram shows the maximum withdrawal flow rate depending on the tank
temperature with a preset hot water temperature of 45 °C at the tap. The integrated control
prevents the temperature from falling as long as the maximum flow rate is not exceeded.
Wi
thd
ra
wal
flo
w
rate
[l
/min]
Po
wer [k
W]
Domestic hot water temperature: 45 °C
Boundary conditions: cold water temperature: 10 °C
Max. pressure drop on the domestic hot water side of the DHW module: 1000 mbars
The following examples show the relations between the variables temperature of domestic hot
water, withdrawal flow rate and temperature of the buffer tank and show their effect on the heat
transfer capacity of the DHW module.
Example 1
Domestic hot water temperature at the withdrawal point: 45 °C
Temperature in the buffer tank: 50 °C
DHW module: max. withdrawal flow rate: 17 l/min, heat transfer capacity: 41 kW
Example 2
Domestic hot water temperature at the withdrawal point: 45 °C
Maximum withdrawal flow rate 28 l/min
DHW module: temperature in the buffer tank: 60 °C, heat transfer capacity: 67 kW
FriwaMini with circulation
Temperature of the
buffer tank
Example 2
Example 1