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Well installation
Circulation pump
the circulation pump of the heat
pump system must be sized in
accordance with the system-specific
conditions. the well pump must be
sized based on the following details:
Heat pump flow rate (heat source
side)
Heat pump pressure differential
(heat source side)
Pressure differential in the line
between the supply well and the
return well
Pressure differential in the valves,
e.g. non-return valve (supplement
approx. 30% on top of the
pressure differential in the line)
Pressure drop in the return well
(empirical value approx. 200 hPa)
Geodetic head (for systems sealed
at the well side)
the total of all pressure differentials
and the heat pump flow rate enables
the selection of the well pump from
the manufacturer's diagram.
Water temperature
the heating heat pump can, when
used as water | water heat pump,
be used to a minimum heat source
temperature of 7 °C.
Checking the flow rate
(to be implemented during heat
pump commissioning) Measure
the flow and return temperatures
of the heat source. Determine the
temperature differential from both
actual values and calculate the flow
rate.
Connection
to prevent the transmission of noise
as far as possible, connect the heat
source circuit with flexible pressure
hoses. install pre-filters or settlement
basins, if higher levels of solid
particles (sand, fine sludge, etc.) are
transported with the well water (water
analysis). otherwise the evaporator
might get blocked.
Circulation pump for well installations
(geodetic head up to 20 metres)
Heat pump
Flow rate
m³/h
Pressure differential
hPa
Circulation pump
type (Grundfos)
Pipe diameter
wPw 7
1.5
105
sP 3A-6
28 x 1.5
wPw 10
2.1
130
sP 3A-6
28 x 1.5
wPw 13
2.6
155
sP 3A-6
35 x 1.5
wPw 18
3.4
280
sP 3A-6
35 x 1.5
wPw 22 M
4.4
370
sP 5A-6
42 x 1.5
Summary of Contents for Heat pumps
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