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Hafner Muschler
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The innovative HM Smart ICE system

The company Hafner-Muschler Kälte- und Klimatechnik GmbH & Co. KG (HM) is very actively involved in the development of thermal energy storage systems. Its innovative system technology HM Smart ICE systems combines futuristic technology with the system user's ecological and economic requirements.

Following projects completed using R134a and R507 as coolants in Germany and Belgium, HM installed its first HM Smart Ice system in a flagship project in August 2013, using the natural coolant propane (R290) in the cafeteria at the Studentwerk Karlsruhe. 
Innovation in publically funded projects: The cafeteria in Adenauer Ring is the first European cafeteria not to use chemical coolants - and in so doing complies with the legal provisions that will come into force from 2022.

The HM Smart ICE flow charts show three HM process groups:

  • HM refrigeration
  • HM Smart ICE storage
  • and the consumers


HM Smart ICE is an environmentally friendly coolant in the form of a two phase mix. The flow ice principle is based on a mix of water and an additive e.g. ethanol or glycol, which reduces the freezing point and therefore allows a pumpable mixture of fluid and fine ice particles to be produced.

The HM Storage Principle night operation (loading time)
The HM Principle aims to refrigerate during the night due to more favourable conditions in terms of energy costs and more efficient operation due to lower outdoor temperatures.
Day mode (discharge time): The storage unit retains the available cooling capacity that all connected cooling units require during the day. This helps alleviate the power demands at peak usage times. Added value to users: The HM concept can very flexibly retrieve the renewable energy created for the production of HM Smart Ice depending on requirements.

The consumers

There are a huge number of areas of application and uses for HM's advanced and environmentally friendly technology. These include chilling foodstuffs (e.g. refrigerated counters and cold storage rooms) and refrigerated transport designs with HM Smart Ice or air conditioning applications. These uses all seek to equalise electricity usage peaks in conventional refrigeration technology.