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Source
Outside the residential units, a heat pump is used as a heat generator on the primary side of the source,
which keeps the sufficiently dimensioned (vapour diffusion-tight) source buffer tank (depending on the
number and size of the residential units) at a constant 20 °C, for example. All REMKO heat pump series can
be used for this purpose, depending on the power requirement. The buffer tank generally provides the usual
dimensions that can be accommodated in any technical or heating room.
From the source buffer tank on the secondary side of the source, a ring line is laid in the house with respec-
tive spur lines to each individual residential unit, from which the respective modular residential heat pump
can draw the necessary energy when required. As explained before for the heat pump module, the 20 °C
warm source water returns to the source buffer tank after energy is released at 15 °C, where it is heated up
again to the necessary 20 °C. The source water is then stored in the source buffer tank.
If, for example, a PV system is used as an option, this system can be combined/coupled with the regulation
of the MWL 35 and used so that - as soon as there is a demand for own electricity - the source buffer tank is
not heated up to 20 °C but to 50 °C, for example. In this case, however, the temperature would be too high
for the heat pump. For this reason, a mixing valve is then used in the secondary hydraulic cycle between the
source buffer tank and the residential heat pump. The inlet is thus always kept at 20 °C by always adding
cold water. This means that at this point there is not 100 % flow from the source buffer tank, but only 40 %,
for example, and the remaining 60 % goes back into the return flow. The PV current is thus converted into
thermal energy in the form of hot water (e.g. with the help of the heating rod). As a side effect, the heating
rod additionally serves as a heat generator in case of failure of the source heat pump.
In this case, we call the buffer tank "source buffer", as this component is in principle the central point for the
collection of all heat generators - whether PV, a heat pump, a stack with water pocket (for e.g. detached
houses), a pellet boiler, CHP, a gas boiler, a solar plant, etc. Any type of (thermal) energy can be fed into this
buffer tank and stored there continuously so that it can subsequently be distributed centrally from here.
The diaphragm expansion vessel [8] can be designed for the entire heating system due to an internal bypass
line within the MWL.
Fig. 7: Source
I:
Residential unit
II: Heating room
1: Air/water heat pump type LWM
(incl. circulating pump)
2: Source buffer 20 °C
3: PV current E-heater
In combination with the MWL 35 modular heat pump, the entire system shown below can thus be described
as "heating in two stages".
I
5
1
4
II
4: Smart Control Touch
5: External probe
6: Source pump (pressure controlled)
7: Mixing valve optional with multiple sources
8: Diaphragm expansion vessel
6
7
M
2
3
8
19
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