Viessmann VITOCELL 100-W - Page 26

Calculating the required flow rate on the heating water side
µ
HW
= Flow rate on the heating water side in l/h
²
req.
or Φ
req.
= Required continuous output in kW
ΔT
HW
= Heating water temperature differential in K
c = Spec. thermal capacity
1 kWh
860 l · K
²
req.
c · ΔT
HW
µ
HW
= =
860 ... ²
req.
ΔT
HW
Φ
req.
c · ΔT
HW
= =
860 ... Φ
req.
ΔT
HW
860 · 69
20
=
= 2967 l/h (total)
= 1484 l/h (per DHW
cylinder)
Sizing
(cont.)
26
VIESMANN
DHW heating
4
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