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Hybrid heat pumps

Hafner-Muschler has been producing heat pumps for commercial and industrial heat and cold generation in the thermal power range above 80 kW for simultaneous provision of industrial heat and industrial cooling energy for many years. The exhaust heat released when cooling the supply medium is provided to heating, including the compression energy.

Hybrid heat pumps by Hafner-Muschler are multi-functional, energy-efficient, reliable and produced customised to our customers' needs in our manufacture.


For asymmetrical cooling requirements and heat demands, the automatic control compensates via the energy source/sink. This way, the energy source is only used at the difference between heat demand and exhaust offer.

Typical thermal sources/sinks:
Latent-energy storage, geothermal energy, ground water, river water, energy piles, sewage, low-ex energy composite


The machine ready for connection contains all hydraulic devices required for the intended operating functions, including speed-controlled circulation pumps, control and switching valves. The integrated freely programmable control is used to monitor the process functions within the defined balance limit. The recommended MSR interface with the peripheral crafts is in the buffer storage of the batch handover.


Typical operating functions

Heating operation:

The heating connection supplies the specified medium temperature. Energy comes to 80% from the source, 20% from electricity as drive energy.

 Heating high-temperature heat pump

Cooling mode:

The cooling connection supplies the specified medium temperature. The exhaust heat is supplied to the sink.

Cooling high-temperature heat pump

Direct cooling:

The cooling connection supplies the desired medium temperature if the sink temperature is sufficient. The sink circuit and useful cooling circuit are separated by plate heat exchangers. The compressors are not in operation.

Direct cooling high-temperature heat pump

Simultaneous heating + cooling:

The desired medium temperatures are provided at the connections for cooling and heating. The exhaust heat of the cooling process, including the compressor heat, is available on the heating side.

Simultaneous heating and cooling high-temperature heat pump

Duo heating mode:

The heating connection supplies low-temperature heat with specified medium temperature. 10% of the heating output is available in parallel as high-temperature heat up to approx. 60 °C.

Duo heating high-temperature heat pump

HM heat pumps – set up well for the future

  • Power range thermal 80 – 2,000 kW*
  • Temperature energy source min. +6 °C (water)
  • Temperature energy source min. -10 °C (water/glycol-mixture)
  • Temperature energy sink max. +35 °C (earth-coupled)
  • Temperature energy sink max. +45 °C (outdoor air)
  • Useful temperatures cooling-side +6 to +20 °C, heating-side +25 to +65 °C
  • Environmentally compatible refrigerants
  • High-efficiency circulation pumps to the buffer accumulator
  • High-efficiency circulation pump for source/sink
  • Programmable logic controller, process visualisation
  • Energy monitoring, data recording
  • Web-based remote system monitoring
    * Outputs above 500 kW are constructed divided for reasons of transport. The connection points are prepared completely in the factory.

Highly efficient cooling circuit with suction-gas-cooled compressor units. Screw-type compressors are used for outputs exceeding 100 kW. Electronic expansion valves, suction gas supercooling. All temperature-carrying lines are diffusion-tightly insulated..


Due to their diversity and the high primary energy efficiency, electrically powered heat pumps are a future-capable solution for the provision of heating and cooling energy. With electrical power increasingly generated from renewable sources, environmental heat, exhaust heat from buildings and production processes can be used at relatively low power demands.

The nicely shaped housing is made of a stable frame construction with muffling cover made of painted steel-sheet cassettes that can be opened.

The flow-optimised hydraulic tubing of stainless steel is completely produced in the factory under high quality demands and tested under pressure. All temperature-carrying lines are diffusion-tightly insulated. The hydraulic connections, either in flange or Victaulic designs, are routed out upwards.

Notes on setup: The compact build of the machine requires accessibility from all sides for later maintenance.


The most refined form of energy, electricity, finds a particularly environmentally compatible application in this heat pump. Where 100% renewable power is used, the requirements of the international climate targets passed for 2050 are already net.

Energy concepts with heat pumps require precise analysis of the available energy sources and sinks at the site of the system and the required useful temperatures. The lower the temperature difference between source/sink and the desired useful temperature, the higher the working figure of the system.

The control cabinet with integrated measuring-control-regulating technology is placed at the front of the machine. It contains all functions required for autonomous operation of the machine. The operating side has a 19“ touchscreen on which the operating functions are visualised. Operating data are saved in the machine and can be read out via the web-based remote monitoring. Monitoring of the operating and safety-relevant messages. Integrated current meters for compressors and secondary units.

Bus interface with the building automation for incoming requirements and outbound messages


Low medium temperature for heating and higher temperature for cooling are the best prerequisites.

Working figure = Ratio useful energy/power consumption (kWhth/kWhel)


Principle chart heat pump HM:hybrid on multiple sources/sinks with batch transfer to buffer accumulator

prinzipschema waermepumpe hm hybrid


  1. Energy storage systems
  2. Earth probes
  3. Energy piles
  4. Ground water
  5. Air cooler
  6. Buffer accumulator cold
  7. Buffer accumulator warm
  8. Hybrid heat pump

Thermal energy sources/sinks for heat pumps HM:hybrid

Thermal energy storage

Cold-controlled as accumulator for cooling supply and avoiding current peaks, creating redundancy, temporary storage of exhaust heat from production processes, server cooling, etc., delayed use as source for useful heat generation. Temperature range withdrawal to +6 °C, heat sink to +40 °C, double use as extinguishing water supply or sprinkler system. Thermal capacity xx kWh/K*m3

Latent-energy storage

Thermal storage with high capacity in the phase transfer liquid to solid, storage medium water. Thermal capacity in the phase transfer 83 kWh/m3

Earth probes, energy piles

Earth-coupled heat transfer mediums use the ground as a thermal energy source or heat sink. The accumulator capacity and transfer output strongly depend on the properties of the ground and require professional assessment. Earth probes require authority permits.

Area collectors, etc.

Apart from the features applicable to earth probes/energy piles, the earth properties, installation depth and natural regeneration capacity must be observed specifically for this build.

Ground water

Access takes place via suction and swallowing wells with low seasonal temperature fluctuations. Suitable well for high transfer outputs. Special requirements to geology, requiring approval, system requires maintenance

Low-Ex ring

Several buildings are connected to a ring composite. It serves as energy source or sink. Excess heat from a building is introduced into the ring, while other buildings use the ring as a heat source. Between the low-ex ring and the building, the hydraulically switchable heat pump HM:hybrid is operating.

Different renewable source and sink systems are to strive for an approximate balance between withdrawal work and heat introduction for long-term secured availability in the course of the year.