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GB 24
The following sample calculation can be helpful for dimensioning the buffer
tank:
The following assumptions have been made in this regard:
Senso M H2OPiko H2O
Size of the buffer tank: 750 l
(approx. 750 kg water)
Water temperature in the buffer
tank at the beginning: 30°C
Water temperature in the buffer
tank at the end: 60°C
Temperature differential 30°C
(corresponds to 30 K)
Water is not taken from the tank
during heating by the Senso M
H2O!
Size of the buffer tank: 500 l
(approx. 500 kg water)
Water temperature in the buffer
tank at the beginning: 40°C
Water temperature in the buffer
tank at the end: 70°C
Temperature differential 30°C
(corresponds to 30 K)
Water is not taken from the tank
during heating by the Piko H2O!
Q = cp×m×t
Q = 4,187 kJ × 750kg×30K
kg×K
Q = 94207 kJ
Q = cp×m×t
Q = 4,187 kJ × 500kg×30K
kg×K
Q = 62805 kJ
This means: To heat up 750 litres
of water in a buffer tank, from an
assumed 30°C to 60°C, a theore-
tical heat quantity of 94207 kJ is
required (losses or heat withdra-
wals in the system have not been
taken into account). This heat
quantity corresponds to approx.
26.2 kWh.
This means: To heat up 500 litres
of water in a buffer tank, from an
assumed 40°C to 70°C, a theore-
tical heat quantity of 62805 kJ is
required (losses or heat withdrawals
in the system have not been taken
into account). This heat quantity
corresponds to approx. 17.5 kWh.
ϑ
E
F
G
H
KLM
N
P
O
QR
S
I
J
B
T
C
D
A
A = temperature sensor for thermal discharge safety valve
B = temperature sensor for thermostatic switch ½'' IG
C = return ¾'' IG
D = flow ¾'' IG
E = safety valve 3 bar
F = bleeding
G = thermostatic switch - pump
H = return riser
I = connection for heating system
J = buffer reservoir
K = return flow temperature boost
L = circulation pump
M = filling and draining fitting
N = diaphragm expansion tank
O = thermal discharge safety device
P = free discharge in e.g. sewer network
Q = "discharge" safety heat exchanger ½'' IG
R = "inlet" safety heat exchanger ½'' IG
S = bleeding 3/8¨
T = thermal discharge safety device
24


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