7 Commissioning [specialist]
22
99640x5xx-mub-en – V01
2020/06
The following diagram illustrates the maximum withdrawal flow rate at a domestic hot water
temperature of 45 °C at the tap, after the addition of cold water of 10 °C.
The domestic hot water temperature set at the controller is of 60 °C.
W
ith
dr
awa
l f
lo
w
ra
te
[l/
m
in
]
Pow
er
[k
W
]
Boundary conditions: Cold water temperature: 10 °C
Example 1
Domestic hot water temperature at the controller: 60 °C
Temperature in the buffer tank: 70 °C
FriwaMidi: maximum withdrawal flow rate: 53 l/min, transfer capacity: 129 kW
FriwaMaxi: maximum withdrawal flow rate: 82 l/min, transfer capacity: 200 kW
Example 2
Domestic hot water temperature at the controller: 60 °C
Maximum withdrawal flow rate: 60 l/min
FriwaMidi: temperature in the buffer tank: ~75 °C, transfer capacity: 150 kW
FriwaMaxi: temperature in the buffer tank: ~65 °C, transfer capacity: 150 kW
Buffer tank temperature
Domestic hot water temperature:
45 °C after heating to 60 °C
and addition of cold water (10 °C)
FriwaMaxi
FriwaMidi
Example 2
Example 1
