Our Technology

Cloud&Heat has developed a water cooling solution which does not only reduce cooling costs considerably compared to conventional air cooling systems but also makes waste heat useable.

Energy flow chart

Our patented technology includes unique know how about control and regulation techniques. This enables high initial temperatures (up to 55°C) at the simultaneously highly stable and fail-safe operation of our servers. This know-how is used in all of your products.

With this technology, we're connecting the markets for server computing power and heat in an intelligent way. This interaction of the ecologic and economic advantages is honored with awards multiple times. The patented technology was developed by our founding team in cooperation with the Dresden University of Technology.

Why our PUE is so low

The high efficiency of our data center can mainly be justified by the used water cooling and the waiver of any classical cooling system. We carried out the measurements in our data center DD2 at Wallotstraße, Dresden, in which the air is pre-cooled according to the needs over an existing underground car park, so that a cooling can take place all year.

Energy flow chart

Explanation of the CO2 calculation illustrated in the energy flow chart of the data center

According to the emission factors 2014 of the Bundesumweltamt[1], every produced kWh of electricity implies a reduction of carbon emission of 0.569 kg. The Cloud&Heat data center (current expansion stage of 60%) needs about 260 MWh electricity a year, which would emit 150 tons of CO2, if Cloud&Heat data center would not be provided by 100% green energy.

Furthermore, additional CO2 can be saved by the useful usage of the waste heat in buildings. Every delivered KWh makes 0.295 kilogram carbon dioxide[2]. By using 100 MWh a year for the heating system, the data center saves about 30 tons of CO2 a year. When the data center is fully equipped, even 52 tons of CO2 can be saved.

Explanation PUE factor

The Power Usage Effectiveness factor, short PUE, describes the ratio between the total used electrical energy, the total energy consumption of the data center, and the used electronical energy of the IT hardware, such as from servers and switches. The lower the PUE, the higher the percentage amount of electrical energy, which is used for the IT equipment. This means that less energy "is lost" for other equipment like the cooling and the lighting. The PUE value is always greater than 1. The nearer the value tends to 1, the lower is the additional energy consumption.

Explanation of the ERE value

Differently to the PUE factor, the Energy Reuse Effectiveness value, shortly ERE, additionally includes the re-used energy. Therefore, the value is most reasonable for evaluating the CO2 primary energy production. For this value, too, the golden rule is that the less the better. In classical data centers, in which the waste heat is not used, equals the ERE value the PUE factor.


[1] "Entwicklung der spezifischen Kohlendioxid-Emissionen des deutschen Strommix in den Jahren 1990 bis 2014" - published 09/2015 by Umweltbundesamt (available here)
[2] "Kumulierter Energieaufwand und CO2-Emissionsfaktoren verschiedener Energieträger und –versorgungen" - published by Institut Wohnen und Umwelt (available here)