Climate Ceiling – Energy-Efficient Heating & Cooling | Green Code

Solid slab with dense steel lattice girders and reinforcement mats in section

The Green Code Climatic Slab® is an industrially prefabricated slab element for efficient heating and cooling without a suspended ceiling system. Near-surface plastic pipe registers are integrated into the concrete panel and enable sustainable temperature control through radiation. The heat storage capacity of concrete reinforces this effect, reduces heating demand, and increases comfort.

The concrete panel integrates truss connectors, load-bearing longitudinal reinforcement, minimum transverse reinforcement, and where necessary, punching shear reinforcement. The pipe spacing is individually optimized and planned for each room based on heating and cooling demand calculations to ensure efficient temperature control. Integrated insulation elements support the system.

Double wall precast element with door and window openings and narrow insulation joint

The Green Code Climatic Slab^® uses thermal radiation to pleasantly warm rooms in winter – without uncomfortable air currents. The system does not primarily heat the air, but instead directly controls the temperature of walls, floors, furniture, and other surfaces. During heating mode, warm water (approx. 30°C) flows through pipe registers integrated into the slab, warming the objects in the room and allowing them to gradually release their heat to the surrounding air. A perceived temperature of 23°C at actual 20°C saves approximately 18% energy.

In summer, the system gently cools through chilled water flowing through the pipes, absorbing heat from surfaces and reducing the perceived temperature by 2–3°C. The integrated insulation enables rapid response times and prevents temperature lag, thereby increasing efficiency. The system operates silently, dust-free, and can be combined with sustainable energy sources such as heat pumps or solar energy – for a healthy indoor climate throughout the year.

Thermal wall with integrated insulation and visible reinforcement in section model

Thermal rays, also known as infrared light or heat waves, are energetic waves similar to visible light. While light is perceived through the eyes, we sense thermal rays through heat receptors in our skin. They are emitted and absorbed by all solid objects, allowing heat to be transferred directly from object to object: cooler bodies warm up, warmer ones cool down. We experience this principle most clearly when we feel the sun on our face or stand near a fire. The human body itself continuously emits infrared radiation through the skin – with a wavelength of approximately 2.3 µm.

Sandwich wall with yellow thermal insulation between concrete shells and mesh structure surface

Fresh air – With Green Code better indoors than outside

Breathing is Living! And what we breathe in our buildings is often of poor quality. Not least because radiators and underfloor heating constantly circulate the air in the room. The air flow continuously distributes inevitable household particles in our breathing air – an invisible burden that the vacuum cleaner cannot capture.

The Green Code Climatic Slab^® gently controls the room temperature from above. The room air is not circulated. Household dust settles to the floor where it can be collected dry or wet. The air is exactly as it should be: clean and fresh!

Climate ceiling with integrated heating and cooling pipes in red and blue

Warm - No Hot Air

We do not heat the air, but rather the objects, floor, walls, and furniture – everything in the rooms. To do this, we install pipes in the slab and gently warm them to surface temperatures of approximately 26°C. The energy is then released as thermal radiation into the room. Wherever heat waves strike objects, they are warmed. Even the air in contact with the Green Code slab is warmed and no longer needs to rise – it is already at the top, forming a thin layer of warm air under the ceiling. Heat is not removed, and air does not begin to circulate. Consequently, the heat energy must be released as thermal radiation into the room. All bodies in the room – floor, wall, sofa, table, even window glass – absorb the heat energy. As a result, all objects are warmer than the air. The air warms at the objects, not the other way around. The floor, sofa, and chairs are warm. Therefore, the measured air temperature with thermal wave heating can be approximately 3°C lower than with conventional heating – the thermometer shows 20°C and it feels like 23°C. This promotes well-being and also saves approximately 18% energy.

Conventional radiators release heat in only a small proportion as thermal radiation due to their design. Most heat is released to the surrounding air; warm air rises toward the ceiling and cooler air flows in to replace it. The entire room's air begins to circulate, and objects in the room – floor, wall, sofa, table, etc. – are only warmed by the passing air, making them always cooler than the air itself. Temperature differences from top to bottom are very significant, which is perceived as uncomfortable. Household dust stirred up by air circulation affects health: With circulating air, settled dust particles are set in motion, carried along, and distributed throughout the room air or kept suspended. Heating air with low humidity and increased dust levels can lead to respiratory irritation and reduced well-being – a concern affecting many people, especially allergy sufferers.

The Advantages:

Rapid response times due to near-surface pipe integration
Each room, including individual zones, separately controllable
Heating cost savings due to "comfort-feel" room temperature approximately 3°C lower (approximately 6% heating energy savings per 1°C)
Low flow temperatures due to 100% active surface area in the ceiling
No dust circulation due to minimal thermal movement
Higher air humidity = health protection (mucous membranes dry out less)

Cool – No Cold Air

In the warm season, the Green Code slab works simply in reverse: instead of warm water, cool water now flows through the pipes. The principle of radiation remains – only this time heat is absorbed. Heat radiated from walls, floors, furniture, and people, as well as rising warm air, warms the ceiling surface. The circulating water absorbs this energy, removes it, and is replaced with fresh chilled water. Thus, the entire room cools noticeably. All surfaces release their stored heat to the slab, become cooler, and can increasingly absorb body heat. This reduces the perceived temperature by approximately 2–3°C below the measured value – a pleasant "comfort-feel" climate with less perspiration, as excess body heat is primarily released through radiation rather than evaporation.

Especially in well-insulated buildings, cooling is becoming increasingly important – often even more relevant than heating. In addition to solar radiation, lighting, electrical appliances, computers, and people themselves contribute to rapid heat buildup. With the Green Code slab, a solution for all seasons is available: The high-quality insulation of the Thermowand reliably keeps heat out in summer and cold out in winter, creating a constant, pleasant living and working climate with minimal energy consumption.

The ecological balance can be further optimized if the required energy comes directly from one's own roof. Those planning sustainably can additionally use the removed heat via a heat pump for domestic hot water heating – an efficient and intelligent way to passively utilize solar energy.

The advantages:

Pleasant cooling without perspiration
No risk of catching cold from cool air streams
Noticeable freshness with consistently high comfort

The Advantages

Solid, long-lasting construction, outstanding fire protection, optimized concrete formulation (carbon-neutral manufacturing by 2050), consistently high quality, various shapes and dimensions, BIM planning, reduced construction time, optimized construction costs, immediately usable and accessible, space-saving on site, enhanced worker safety, clean construction site with less noise and traffic.
Large spans possible: up to 12 meters
Concrete panel thicknesses: 4.5 – 7 cm
Rapid response times due to near-surface pipe integration
Each room, including individual zones, separately controllable
Heating cost savings due to "comfort-feel" room temperature approximately 3°C lower (approximately 6% heating energy savings per 1°C)
Energy savings due to "comfort-feel" room temperature approximately 2–3°C higher (e.g., 26°C instead of 24°C): less cooling required
Particularly suitable for renewable energy generation such as heat pumps and solar thermal systems due to low flow temperature required
Particularly pleasant temperature sensation through thermal radiation
No dust circulation due to minimal thermal movement
Versatile applications: ideally suited for any construction project, such as office buildings (offices, schools, kindergartens), residential buildings, hotel buildings, commercial and industrial buildings