Viessmann Ice Energy Store technology Architects, builders, contractors, developers, engineers and planners must discover the HVAC future, now.

"Bernd Schwarzfeld, a pioneer in the move to renewables."

"Top technology."

The Viessmann Ice Energy Store system:

The ice energy store system provides heat pumps with a heat source which allows intelligent linking and efficient storage of several renewable energy sources.

The energy required for operating the heat pump is provided by the ice energy store system from various primary sources. Here, the ice store acts as an intermediate store of available energy.

Active energy source management by a team of experts enables continuous optimization of the system and provides efficiency, reliability and operating cost stability.

Why an ice energy store system?

  • Combines three renewable energy sources for heating and cooling: sun, air and geothermal heat
  • Uses crystallisation energy for heating
  • Balances out seasonal flucuations in the natural energy supply
  • Uses water as the storage medium and is therefore harmless to the environment and can be used anywhere
  • No official permits required
  • Operating cost stability by the use of active energy source management
  • Complete system is configured to individual requirements and tailored to the specific property
  • Personal support from the first concept to the implementation of the system
  • Can be used for Corporate Communications due to the fascinating functionality

How the ice energy store system works.

At the heart of the ice energy store system is the concrete tank which is buried underground and filled with water as the energy store medium. This is used as the energy source for a brine/water heat pump. In this system, the heat pump extracts the energy required for central heating and DHW heating from the ice energy store.

As water is both harmless to the environment and has a high thermal capacity of 1.163 Wh/(kg x K), it is an ideal storage medium for thermal energy.

Energy is initially extracted from the liquid water. As more heat is extracted, the water freezes and becomes ice. This phase change from liquid to solid provides the heat pump with additional energy in the form of crystallization energy.

The thermal capacity indicates the amount of heat that needs to be supplied to one kilogram of a substance in order to heat that substance by 1 K. An even higher energy density is achieved by utilising the crystallization heat as the store ices up. The transition from water to ice provides 93 Wh/(kg x K) of crystallisation heat; this is equivalent to the amount of energy released when heating water from 0 to 80 degrees Celsius.

The ice energy store has a patented heat exchanger system comprising an extraction and regeneration heat exchanger. The extraction heat exchanger is part of the primary circuit of the heat pump. The heat pump extracts energy from the ice energy store by means of the extraction heat exchanger. This energy is delivered to the heating system via the refrigerant circuit. The regeneration heat exchanger is part of the absorber circuit. Energy from the solar air absorbers is supplied to the ice energy store by means of the regeneration heat exchanger; this warms up the ice energy store.

Temperatures below room temperature are generally not useful for the purposes of heating DHW or heating water. Heat pumps make it possible to utilise low temperature levels for yielding heat.

"Viessmann Ice Energy Store: Heating and natural cooling with tap water and natural ice."

The components of the ice energy store system at a glance:

  • Ice energy store tank
  • Solar air absorbers
  • Brine/water heat pump
  • Level sensor
  • Heat source management system
  • Optional visualization package

Cooling with the ice energy store system.

One way of getting the most out of the ice energy store system is to use the ice energy store for natural cooling during the summer months. To this end, the ice energy store is turned to ice at the end of the heating season by interrupting the store regeneration process. The ice created this way is then available as a reservoir for natural cooling.

To expand the period of time for natural cooling, the solar air absorbers use lower outside temperatures at night to cool down the water in the storage.

If the current cooling demand cannot be met by the naturally formed ice or if all-year-round cooling is required, then it is possible to cool the building directly via the heat pump (active cooling).

"The ice created during the winter season can be used for natural cooling."

Active energy source management – stable operating costs guaranteed.

Active energy source management is the most important component for ensuring efficient use of the ice energy store system. Taking into account specific seasonal requirements placed on the energy source, weather conditions and the individual use of a building, a team of experts is managing your plant to get the best out of it.

The aim of this management is firstly to supply the heat pump with the highest possible average brine inlet temperature during the heating season. Thereby the amount of electric energy required by the heat pump can be minimized. Accordingly the heat pump efficiency is at the best possible rate which means that costs will be reduced.

It bases its calculations on data generated by temperature sensors located in the store and at the collector outlet. Information about the ice level in the ice energy store tank is provided by a radar sensor installed on the tank cover. The active energy source management ensures the highest level of operating cost stability, operational reliability and energy security.

The link below takes you straight to a web visualization (Java required!) of an ice energy store system in an office building. It demonstrates which energy source is used when and to what extent; it also shows the amount of energy that can be made available in total.


The ice energy store system is suitable for all construction projects with outputs of 21 kW and above. It can provide both heating and cooling. This can be done at different times or at the same time. A number of different areas of application can be covered using standardised hydraulic schemes whereby planing costs decrease.

Ideal for:

  • Housing industry
  • Manufacturing facilities
  • Office buildings
  • Multi story buildings
  • Supermarkets
  • Restaurants
  • Hotels
  • Swimming pools
  • Schools/nurseries
  • Care homes
  • Hospitals
  • Refrigerated warehouses
  • Other buildings with high heating or cooling demand

"The largest ice energy store plant in the world actually, Ecolab Germany."

Watch the gorgeous video.

Ice energy store tank with integral heat exchanger system.

The underground concrete tank is used as a buffer store for primary heat sources and is manufactured in cooperation with our partner companies to meet the specific requirements of an ice energy store as well as the individual specifications of each building project.

The concrete tank can be either cylindrical or rectangular in shape, the construction taking into account the tank‘s particular structural requirements. The required minimum internal height is 2.00 metres. The maximum achievable internal height is 6.00 metres.

In contrast to conventional thermal store systems, the ice energy store system operates at low temperature level. Consequently incurs no losses when in use.

During the colder months of the year, the stored energy is used to heat the building. As a result, the store cools down and ices up during this period, thereby enabling it to be used during the warmer months either to cool and condition the building or as a heat sink for unused process heat. In addition, the waste heat from the rooms can be returned to the store and stored at low temperature.

The extraction heat exchanger uses the sensible heat and latent heat contained in the water during the heating period, in conjunction with conversion of water into ice.

The regeneration heat exchanger transfers heat from the solar air absorbers or from the building cooling process directly to the store.

Elimination of the blast effect.

In nature, when water freezes and forms ice, the process occurs from the outside inwards and top town. Reversing this freezing process, inside outwards and bottom-up prevents forces being transferred to the store structure, thereby eliminating the explosive effect.

"The inside of an ice energy store, ready for the tap water to run into the tank once."

Advantages of partnerships:

  • Our partner companies are well qualified to meet the thermal and mechanical requirements of an ice energy store system
  • Tailored processes and defined interfaces ensure cost certainty, adherence to schedules and fast installation

Solar air absorbers.

The SLK-600 is an open collector for installation on flat roofs. It utilizes ambient heat from the air, rain, diffused and direct insolation and frost and is used to heat up the ice energy store and as a direct heat source for the heat pump.

The SLK-S/-W collector provides an alternative solution for installation on pitched roofs or walls. Installation in the form of an energy fence is also possible.

Solar air absorbers focus on heat recovery from the ambient air, as this is available night and day. Insolation represents a welcome additional heat source which increases the efficiency of the system.

The non-glazed solar air absorbers are particularly well suited for use in an ice energy store system because they also provide energy for the system at low ambient air temperatures and when there is no insolation.

By contrast, conventional solar collectors are not suitable as a heat source for the ice energy store system as these do not extract heat from the ambient air but instead only supply energy when there is direct or diffuse insolation. This is not available in sufficient quantities during the heating season.

Energy sources for solar air absorbers:

  • Ambient air
  • Direct and diffuse insolation
  • Precipitation
  • Humidity: dew and frost

Perfectly depicted with the visualization package.

As part of the visualization system, sections of the store tank below the surface of the water are illuminated.

A camera installed on the tank cover also enables real-time images to be transmitted from the store. These images can be used to observe the current processes in the tank.

Sustainability and environment protection essentially influence a company‘s success. Due to its fascinating mode of operating heating with ice is often mentioned in the media and can be used really effective in Corporate Communications.

An engaging and eye-catching visualization system is particularly advantageous if the ice energy store is to be used for publicity purposes or to make a statement about a company‘s efficient use of energy resources.

If the visualization package is ordered underwater lamps are installed as standard. Other variations, for example blue lighting in the cooling phase and red lighting in the heating phase, can be installed to demonstrate system operation even more expressively.

Our services at a glance.

  1. Solution development: Individual simulation of each system allows it to be optimally sized and ensures that all on-site conditions are taken into account (e.g. use of computer centers or the waste heat from buildings to heat up the ice energy store, etc.).
  2. Definition of the scope of services: Together, we specify the scope of services that will suit your project and define which system modules are relevant for each case.
  3. Supply and installation of the system: At the agreed time, all components are delivered and installed in accordance with the defined scope of services (solar air absorber in kit form or pre-assembled, etc.).
  4. Bringing into service: The bringing to service is vital for ensuring that the system operates correctly and is optimised in terms of energy efficiency. Bringing to service is therefore carried out with the assistance of an employee from Viessmann Ice Energy Store.
  5. Operational support: As your partner, we are here for you whenever you need us, working closely with you to provide system support. This enables company holidays and busy work periods to be taken into account when managing the system, for example.
  6. Active energy source management: The more energy efficient the system is, the more economical it is. Optimum energy source management makes best use of the ice energy store system and ensures that operating costs can be kept consistently low.

Ice Energy Store, Inc.

Mr. Jens Karsten

phone +1 (305) 767-7276

twitter @IceEnergyStore

hashtag #IceEnergyStore

Created By
Jens Karsten

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