Why Bluezero Building?

Bluezero Building is the ecological concept of climatisation of buildings from Ef cient Energy. Core element is a climate neutral water chiller which uses water as a refrigerant. With a cold water ow temperature from 12°C, it is ideally suited for comfort cooling in buildings.

100% Water, 100% Natural, 100% Eligible

With a GWP of zero, the eChiller exceeds the EU criteria and guidelines in terms of energy ef ciency, climate friendliness and workplace safety. All conditions and operator obligations for conventional refrigeration systems are completely obsolete. The chillers are eligible for common funding pro- grams and meet the sustainability requirements of the German KfW Bank and correspond to the strict international certification systems such as BREEAM or LEED. Therefore, building operators receive the necessary planning and investment security for ecological construction.

Why Water?

Water R718 as a natural refrigerant has an almost revolutionary character. It is available, and easy to handle and dispose. It is neither toxic, nor ammable or explosive. Water R718 as a refrigerant, ful lls the F-gas directive requi- rements and does not fall under the F-gas regulation. All safety requirements applicable to uorinated refrigerants do not apply. In addition, water possesses excellent energy ef ciency values with a high energy yield due to its material and thermodynamic characteristics.

*GWP = Global warming potential, ODP = Ozone depletion potential

Increased living and perfor- mance standards, and of course climatic changes, set new expectations of air con- ditioning for living rooms and of ce spaces. About 50% of the of ce and administrative buildings are equipped with air conditioning. Their ener- gy requirement is about 100 times higher than residential buildings. The Ecodesign Study shows that the ener- gy-related CO2 emissions caused by air conditioning will increase about 25% for non-residential buildings by 2030. At the same time, the German Government‘s energy concept calls for an almost climate-neutral building stock by 2050. The same scenario applies to most European countries.
(Source: Federal Environment Agency 2015).

The EU F-gas regulation aims to reduce Europe-wide the emissions of traditionally climate-damaging HFC ref- rigerants of 70% by 2030 compared to the level of 1990. What does that mean for building operators? A sharply reduced availability
of conventional refrigerants and rising operating costs due to higher refrigerant, safety and maintenance costs. Last but not least, the uncertainty about the future eligibility and availability of HFC refrige- rants. Natural refrigerants in the building air conditioning become the new standard.

Climate-friendly cooling of buildings – Challenges for architects, technical building planners and builders

According to the Paris Agreement from 2015 and the action plans till 2050, the building air conditioning takes a new meaning. Architects, technical building planners and building operators are facing the challenges to plan or renovate envi- ronmentally friendly and optimally con gurated air conditio- ning concepts. In addition to energy ef ciency, cooling loads, comfort requirements of building users and the choice of adequate system, a variety of requirements and regulations of the refrigeration industry need to be complied to:

EU Building Directive: Implementation in national law by the Building Energy Act

EU Ecodesign Directive: Product directive regulates energy ef ciency of chillers

EU F-gas regulation: Gradual reduction of conventional HFC refrigerants by 2030 and already today ban on new systems

DIN EN 378-1: EU standard for safety of people and protection of the environ- ment, procedures for operation, maintenance and repair of refrigeration systems including installation conditions and machine room

How ecological is a chiller?

The answers to climate friendliness and the impact of energy ef ciency of a cooling machine on the greenhouse effect gives the TEWI index (Total Equivalent Warming Impact).
This method is to judge the in uence upon the global warming effect for the operation of individual refrigeration plants. The TEWI results from the sum of the refrigerant ́s GWP plus the lifetime energy consumption of a refrigeration system.

Cost comparison: Carbon-neutral eChiller for a panel cooling system

According to the EU Ecodesign Directive, chillers must satisfy minimum requirements to comply with energy ef ciency. The basis for panel cool- ing systems is a de ned load pro le at cold water ow temperatures
of 18°C and a spread of 5K.

Cooling distribution in the building:
What possibilities are available?

Basically, the cold is distributed via water or air.

Medium: Water

Panel cooling systems work with closed circuits of cooled water. The cold water ow temperatures are usually above the dew point to avoid the formation of condensation. The bene ts result in higher comfort and energy ef ciency as well as no need for insulation. They re ect the requirements of modern construction.

Cooling sails are attached under the ceiling and can also be used as interior design elements. Extruded pro les of aluminum act as a transmission medium to the room.

Closed chilled ceilings are suitable for low room heights. The cassettes are integrated ush into the ceiling. Clay ceilings are a particularly ecological, elegant and energy-ef cient variant of panel cooling systems. The natural material allows not just the cooling, it also regulates the humidity in the room. Clay modules are mounted directly under the ceiling and then plaste- red. Further variants include concrete core activation or the oor cooling.

Medium: Air

Cooling convectors can be installed free-hanging or ush with the ceiling. A comfortable version is a silent convection cooling without draft. Under oor convectors or fan coils are also common. If the cooling coils are integrated into the ventilation system, cooling can be provided directly via the additional air. Are there plans not to waive the comfort of surface cooling systems, and there are additional requirements for the dehumidi cation, a combination of both systems is possible.

Bluezero Building – the ecological concept of building climatisation

100% water, 0% emissions sustainable – powerful – energy ef cient – made in Germany

Key advantages of the eChiller in buildings

  • Indoor installation without requirements
  • Quiet and vibration-free operation
  • Climate-neutral and free of chemicals
  • No operator obligations
  • Future-proof due to no regulations

That's why Bluezero Building!

Climate friendliness

  • – 100% water, 0% GWP
  • – No contamination via leakage
  • – 0% direct CO2 emissions
  • – Climate-neutral chiller

Integration into a green energy concept with green power Active reduction of CO2 footprint

Energy efficiency

  • – Stepless operating modes incl. free cooling e.g. overnight cooling
  • – Decentralized structure possible: refrigeration on-site, where it is needed
  • – No starting currents

Efficiency benefits in cooling with higher cold water flow temperatures Overachievement in energy efficiency according to Ecodesign Directive

Operational safety

  • – Safe for humans, environment and buildings
  • – Low maintenance requirements and oil-free system
  • – Unrestricted frost-free installation

Fulfillment of the requirements of building security and protection Monitoring and 24/7 remote access option


  • – No refrigerant costs
  • – Secured availability of refrigerant
  • – No disposal, no recycling of the refrigerant
  • – Reduced maintenance costs

Low running costs Eligible for several European funding programs No typical requirements to engine room

Planning and investment security

  • – No F-gas regulation
  • – No DIN EN 378
  • – Capable of certification, e.g. BREEAM, LEED

EU Energy Efficiency Act Future-proof refrigeration solution without regulatory limitations

Do you have questions about Bluezero Building?

Feel free to contact us if you have any questions about Bluezero Building or Efficient Energy.

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