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How split systems work
3. How split systems work
An air/water heat pump extracts thermal energy from the
ambient air (low temperature) and transmits it together with
electrical drive energy in the form of useful heat (higher
temperature) to a heating and/or DHW circuit.
The heat pump consists of separated circuits linked togeth-
er via heat exchangers:
► Heat source circuit (extracting heat)
► Refrigerant circuit
► Heat sink circuit (supply of heat for room heating and/
or DHW)
Outdoor air is a heat source that is available everywhere
in unlimited amounts and can be utilised without approval.
It is especially suitable for retrotting.
A split system consists of an indoor unit and a separately
installed outdoor unit. The outdoor air is routed through the
outdoor unit by means of a fan. The indoor and outdoor
units are connected through refrigerant lines.
Due to the defrosting mode integrated into OCHSNER air/
water heat pumps, the system also operates awlessly at
temperatures below -15°C.
For air/water heat pumps, the most ecient and therefore
most common operating mode is bivalent parallel opera-
tion.
Due to the integral defrosting mode, the monovalent op-
erating mode is also possible. As the heating output of an
air/water heat pump at an outdoor temperature of +15°C
is approx. triple the heating output at -15°C, such systems
are vastly oversized for operation in spring and autumn
and therefore not recommended.
1 Evaporator (outdoor unit)
2 Compressor
3 Condenser (plate heat exchanger)
4 Expansion valve
5 Heat sink (heating, DHW)
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