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the Watt d'Or award ceremony 2019) ### Multiline Text HTMLText_40719B9B_102C_E4E4_41AE_E7911D880DFC.html =
Unfortunately, your answer is not correct.


But feel free to look around before you return to the Christmas tree. There is much to discover here.


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Questions and feedback


Do you have specific questions or would you like to give us feedback on the virtual NEST tour? Then get in touch with us.



Further information


Would you like to be informed regularly about the activities at NEST and Empa? Then please find our media subscriptions here.



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Bifacial photovoltaic modules


The energy supply for the operation of the Solar Fitness & Wellness unit is provided almost exclusively by three solar systems. One of them is located on the roof and another on the south façades of the unit. Both systems are equipped with bifacial photovoltaic modules from Meyer Burger, which convert sunlight into electrical energy on both sides. The light is reflected by the material of the roof or the white cladding of the façade and thus hits the back of the modules. The system on the roof has an area of 95m², the one on the south façade of 17m². Together they have an output of about 20 kWₚ.
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Bio sauna


The bio sauna in the Solar Fitness & Wellness unit can accommodate four people and has an operating temperature of about 60°C with a relative humidity of about 50%. Like the other two wellness modules, the bio sauna is exceptionally well insulated. While today's saunas are usually electrically operated, the air in this wellness module is circulated by a fan through a heat exchanger behind the bench. A water injection before the heat exchanger ensures that the heated air finally contains the desired humidity.
In addition to heat, humidity is also recovered in the bio sauna. For this purpose, an enthalpy exchanger is used, which removes the moisture from the exhaust air and transfers it to the supply air. The supply air and the exhaust air are controlled by a CO₂ sensor.
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Finnish sauna


The Finnish sauna in the Solar Fitness & Wellness unit can accommodate four people and has an operating temperature of around 90°C. Like the other two wellness modules, the Finnish sauna is exceptionally well insulated. While today's saunas are usually electrically powered, the air in this wellness module is circulated by a fan through a heat exchanger behind the bench, where it is heated to the operating temperature. Another heat exchanger in the ventilation system ensures that part of the heat is recovered by taking the exhaust air and fed it to the supply air. The supply air and the exhaust air are controlled by a CO₂ sensor.
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Floating ellipsoids


The wellness modules in the Solar Fitness & Wellness unit are approximated to the spherical shape, as this has the most favorable surface-to-volume ratio and thus the least heat loss. Suspended from the roof, the ellipsoids float above the fitness room, providing intimacy and at the same time desirable views. Despite the confined space, the result is a three-story room flooded with daylight that reveals its unique use even to viewers from the outside. The architectural concept was developed by dransfeldarchitekten ag.
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Hoch- & Tiefgestellte Zeichen



Hochgestellt:


⁰ ¹ ²² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹


⁺ ⁻ ⁼ ⁽ ⁾ ⁱ ⁿ


Tiefgestellt:


CO₂CO₂,


₀₁₂₃₄₅₆₇₈₉


₊ ₋ ₌ ₍ ₎
ₐ ₑ ₒ ₓ ₔ ₕ ₖ ₗ ₘ ₙ ₚₚₚ ₛ ₜ



Liste unter: https://de.wikipedia.org/wiki/Unicodeblock_Hoch-_und_tiefgestellte_Zeichen


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Photovoltaics in the glass façades


The energy supply for the operation of the Solar Fitness & Wellness unit is ensured almost exclusively by three solar systems. One of them is integrated directly into the glass façades on the east side. These are laminated safety glass modules with a total area of 41m² and 4 kWₚ output.
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Solar Fitness & Wellness: A sustainable way to a better quality of life


Fitness and wellness constitute a growing demand in our society – normally at the expense of energy and the environment. The Solar Fitness & Wellness unit demonstrates that there is indeed another way.


Innovative wellness technology based on a high-temperature heat pump makes it possible to reduce the energy consumption of wellness systems in such a way, that the energy generated directly at and in the unit is sufficient to operate two saunas and one steam bath.


Use: Fitness & wellness


Opening: August 2017


Partners: suissetec, Empa, Lucerne University of Applied Sciences and Arts, NTB Interstaatliche Hochschule für Technik Buchs, Belimo Automation AG, Flumroc AG, Laufen & arwa, Sauter AG, Schenker Storen AG, Technogym, Drans - feld Architekten, Ernst Schweizer AG, Fit & Wellness Concept, Glas Trösch AG, Grundfos Pumpen AG, KIFA AG, KLAFS AG, Küng Sauna + Spa AG, Meyer Burger Technology AG, Migros, Miloni Solar AG, NeoVac, Scheco AG, Swiss Eco Tap, vogt - partner, Gasser Fassadentechnik, Helios Ventilatoren AG, HSSP AG, Mountair AG, OBM Bionik, Serge Ferrari AG, WAGNER VISUELL AG, Wenger Fenster AG


Website Solar Fitness & Wellness
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Solar thermal collectors


On the south façade of the Solar Fitness & Wellness unit, thermal vacuum tube collectors provide hot water for the high-temperature grid. The system covers around 6m² and has an output of around 4.5 kWₚ.
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Stay fit and generate electricity at the same time


In the Solar Fitness & Wellness unit, fitness users actively contribute to the generation of energy for the operation of the entire facility. In fact, the Technogym bikes and cross trainers feed the energy generated into the grid. All the strength equipment is also equipped with an internal dynamo, which allows the integrated displays to be powered by the energy of the athletes and no additional energy is required.
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Steam bath


The steam bath in the Solar Fitness & Wellness unit can accommodate four people and has an operating temperature of about 45°C with a relative humidity of about 100%. Like the other two wellness modules, it is exceptionally well insulated. Whereas in a conventional steam bathwater is brought to evaporation electrically, here an alternative concept ensures the desired room climate: water is heated to about 80°C via a heat exchanger and air flows through it by means of a blower. This allows for optimal integration into the heat cascade of the unit, which would not be the case with a traditional steam bath.
Since a large part of the energy in the steam bath is stored in the humidity, the humidity is also recovered in addition to the heat recovery. For this purpose, an enthalpy exchanger is used, which removes the humidity from the exhaust air and transfers it to the supply air. The supply air and the exhaust air are controlled by a CO₂ sensor.
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Textile façade


In addition to lots of glass on the east and north sides, the remaining opaque shell of the Solar Fitness & Wellness Unit is covered with textile. The micro-ventilated membrane provides protection from the weather and provides an aura of tranquility.
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Water-saving tap


The "Swiss Eco Tap" faucets are used in the restrooms of the Solar Fitness & Wellness unit. Thanks to a spray technology, the faucets reduce water consumption for hand washing by 90 percent. In addition, there is no need to heat water, which reduces energy requirements to zero.
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Wellness technology based on a high-temperature heat pump


The heart of the innovative wellness technology is a high-temperature CO₂ heat pump. It plays a decisive role in reducing the energy requirements of the wellness facility to such an extent that the remaining demand can be covered by solar energy generated directly at the unit.


Unlike conventional heat pumps, in which the refrigerant is liquefied and evaporated at a certain temperature (approx. 55°C), the CO₂ does not undergo a phase change even under high pressure (up to 130 bar). The CO₂ heated up to 130°C is in a so-called transcritical state. This allows the heat pump to deliver heat at different temperatures.


For efficient operation, the heat generated must be used over as great a temperature range as possible. For this purpose, the respective demand of the different wellness modules is coordinated as a cascade. The heat is stored in layers in a large tank and made available for the individual uses: 115°C for the Finnish sauna, 90°C for the steam generator in the steam bath, 70°C for the biosauna and finally 55°C for the showers. Any excess low-temperature heat (38°C) is extracted directly from the heat pump and fed into the heating system.


By generating heat with the CO₂ heat pump, electricity consumption is already reduced by around two-thirds. Heat and moisture recovery from the sauna and steam bath, as well as optimized operation, help to further minimize energy requirements.


To the technical details for experts
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