From ice to warm home - Viessmann

A new German developed heat pump system uses an ice store to both heat and cool reducing running costs and installation expense.

Viessmann, the manufacturer of heating systems, has collaborated with HUF HAUS, the market leader for contemporary post-and-beam architecture in Europe, to equip a UK residential property with first-of-its-kind technology.

Viessmann’s ice store system, which recovers energy exclusively from renewable sources to heat or cool a building and to heat domestic hot water, has been installed as an integral part of a new phase of sustainable residential architecture being demonstrated at HUF HAUS’ first UK show home, at Brooklands near Weybridge in Surrey.

The heat pump extracts energy, as needed throughout the year, from water stored in the ice store. As this energy is used, especially during the winter heating season, the temperature of the water in the ice store falls. If the temperature in the store falls to freezing point, additional energy is obtained from the freezing of the water - hence the term ice store.

Freezing is an exothermic process, meaning that as liquid changes to solid, heat is released. The energy released upon freezing is a latent heat, and this means the potential energy in the ice store system is predominantly stored as latent heat. During the water’s phase transition from liquid to solid, a standard ice store for a detached house of approximately 10m3 generates a heat gain equivalent to about 100 litres of fuel oil. A 10m3 storage system is capable of 10kW of heating output.

As soon as the store water temperature falls below the temperature level of the surrounding ground, the storage system starts to absorb heat from the soil. If the store has iced up, it continues to be replenished by heat from the ground. Conversely, in summer the store's surface is used to dump heat into the ground. This has an automatic regulating effect whereby the store content is prevented from overheating during the summer. 

In summer the ice store can also be used to provide natural cooling for the building’s interior. This feature is an optional extra. Here, the water is allowed to fully turn to ice at the end of the heating season by the heat source management which interrupts the store regeneration. The ice created this way is then available as a source of natural cooling.

For more information visit the Viessmann website.

To read the full article see the latest October edition of EiBI.

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