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Archive for the category “Germany”

Airborn Solar Panels


“Liftoff, we have a liftoff!”. Europe, one of those territories eagerly absorbing photo-voltaic energy generation, has a little bit of a space problem, being one of the most densely-populated areas in the world. A field covered with solar panels unfortunately can’t be used for agriculture. Or can it? The Fraunhofer Institute has found out that it is very well possible to use land for both agriculture and energy generation by stacking both functionalities.

Upshot agricultural yield: corn slightly negative, but grass and shadow-loving potatoes make no difference.

Influence partly shadowing on different crops

[wikipedia.com] – Agrivoltaic
[ise.fraunhofer.de] – Agrophotovoltaics Goes Global: from Chile to Vietnam
[biomlandconf.files.wordpress.com] – 20 slides Fraunhofer Institute
[cleantechnica.com] – Fraunhofer Experiments In Chile And Vietnam Prove Value Of Agrophotovoltaic Farming
[cleantechnica.com] – Combining Solar Panels With Agriculture Makes Land More Productive

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Enyway – kWh Flea Market

Enyway is a new market for locally produced electricity and spin-off of a large renewable energy producer Lichtblick (“glimmer of hope”), a sort of AirBnB for electricity. Enyway is not a producer but a market place, a mediator. If you have a spare roof or unused piece of land, you can install solar panels and directly sell you electricity to others via the Enyway portal. This development could encourage private investment in renewable energy. The key-success factor could be the feed-in tariff system, that could be abolished soon, now that the energy transition is in full swing. Local producers could use this to sell their renewable energy to buyers, who prefer renewable energy over fossil-generated kWh’s. The real upshot is that new investment opportunities open up for private persons. increasing the speed of the energy transition.

[enyway.com] – Company portal
[spiegel.de] – Diese Mühle erzeugt 100.000 Kilowattstunden Strom
[de.wikipedia.org] – Lichtblick (Unternehmen)

The State of Solar

[worldatlas.com] – Countries That Use The Most Solar Power
[energy-charts.de] – Electricity-production in Germany

There is Still Potential in Thermal Solar

[ingenieur.de] – Solarthermie: Effizienter durch neue Techniken

Sono Sion Solar Car

German solar car. Price 16,000 euro. Range 250 km. On a sunny day the owner gets 30 km “for free” from the sun. Did you hear that, Australians? Californians? 35 kWh battery needs to be rented additionally. Deliveries starting by the end of 2019. The producer hopes to sell 10,000 cars per year.

[sonomotors.com] – Official site
[wikipedia.org] – Sion (electric car)
[groen7.nl] – Sono Sion moet zonnewagen voor alledag zijn

Wire Up Geothermal Heat With Graphene

Two Russian scientists discovered that graphene can have exceptionally large thermal conductivity, up to 5300 W/(m.K), something like 12,000 times better than copper and got rewarded with the Nobel Prize in 2010. Watch the video below showing how you can cut though ice with a graphene blade, using heat from your fingers. The Manoj Bhargava Indian billionaire thinks that graphene (carbon) cables could revolutionize how we extract heat from geothermal wells and distribute heat and invests in the technology. The idea is to abandon the concept of geothermal heat transfer through fluid motion, and instead use thermal conductivity of graphene to bring heat to the surface of the earth via wires, without moving material, pumps and pipes.

[wikipedia.org] – Manoj Bhargava
[phys.org] – Physicists show unlimited heat conduction in graphene
[wikipedia.org] – Graphene
[thinkgeoenergy.com] – Could a new approach to thermal conductivity revolutionise geothermal?
[futurism.com] – Thanks to Graphene, We May Harness The “Limitless Energy” Beneath Earth’s Surface
[graphene-info.com] – Graphene thermal conductivity

Volkswagen SEDRIC Autonomous Concept

[cnet.com] – VW Cedric
[arstechnica.com] – Volkswagen unveils Sedric, its first fully autonomous vehicle
[volkswagen-media-services.com] – Sedric in Shanghai: Self-Driving Car without a cockpit celebrates premiere in China

Autonomous Driving with Volkswagen MOIA

NordLink – Connecting Germany and Norway

[wikipedia.org] – NordLink

New Approach Pumped Hydro Storage

A company from Stuttgart, Germany proposes a new way of thinking about hydro storage. The design entails a giant cylinder with a stone piston sawn out of rock. During times with excess renewable energy the piston is lifted by water pressure from underneath. The potential energy can be retrieved by letting the piston sink again, propelling turbines.

A first pilot of 30 m deep and 20 m diameter is to be build in Saudi-Arabia, but no financial means have been allocated so far. Paperware so far.

[heindl-energy.com] – Company site
[spiegel.de] – Tüftler machen Gefällekraftwerk ohne Gefälle möglich

Solar Air Collectors

Early December, outside temperature 6C/43F. Two simple air collectors and ventilators. Max output temperature: 62C/143F

[mahnecke.de] – Solar air collector project in northern Germany

Still waiting for the first solar air collector project where the black absorber back plate consists of a black solar panel. The collector should be constructed as such that the glass/acryl cover can be removed in the spring and put back again in the autumn to avoid too high solar panel temperatures during the summer. Special construction absorber with window screen.

Componentlist:

Siebdruckplatten: Materialstärke (Seitenwände) 21 mm – 35 €/m²
Materialstärke 9 mm (Rückwand) – 20 €/m²
Acryllack, Dose mit 125 ml – 4,99 €
Aluschiene, 1 cm x 3 cm x 200 cm (2mm), 2 Stück –
Aluschiene, 3 cm x 3 cm x 200 cm (2mm), 1 Stück –
Aluschiene, H – Form
Schrauben V2A, 4 x 25
Schrauben V2A, 3,5 x 16
Schrauben V2A, 4,5 x 45
Fiberglasnetz, 1m x 3,40 m
Acrylglasscheibe (Gewächshaus) 70 x 160 cm
Computerlüfter 12 V, 120 mm, 115 m³/h

Acryl cover

The end result

Some data:

01.03.2013 – complete sunny day
Collector temperature: 39,5 °C

VW E-Crafter Van 200 KM Range

First roll-out in Germany, Holland, UK, Sweden.

[cleantechnica.com] – Volkswagen Delivers First e-Crafter Vans To Customers In Europe

Siemens Reports EROI Onshore Wind of 50 or Larger

Siemens SWT-3.2-113

According to the manufacturer Siemens has their SWT-3.0-113 wind turbine an energy payback time of 4.5 months. With a (conservative) minimum life span of 20 years, that would mean an EROI of 240/4.5 = 53.

[siemens.com] – Press release

High Temperature Electrolysis


Sunfire’s field of operation

Dr. Oliver Born: this presentation is mainly about using waste heat steam for hydrogen production. With steam you can typically achieve 20% higher efficiency with steam than with low temperature water.

[wikipedia.org] – High-temperature electrolysis

During electrolysis, the amount of electrical energy that must be added equals the change in Gibbs free energy of the reaction plus the losses in the system. The losses can (theoretically) be arbitrarily close to zero, so the maximum thermodynamic efficiency of any electrochemical process equals 100%. In practice, the efficiency is given by electrical work achieved divided by the Gibbs free energy change of the reaction.

In most cases, such as room temperature water electrolysis, the electric input is larger than the enthalpy change of the reaction, so some energy is released as waste heat. In the case of electrolysis of steam into hydrogen and oxygen at high temperature, the opposite is true. Heat is absorbed from the surroundings, and the heating value of the produced hydrogen is higher than the electric input. In this case the efficiency relative to electric energy input can be said to be greater than 100%.

[sunfire.de] – Sunfire company site

[sunfire.de] – Low cost hydrogen production
Sunfire achieves 82% electrolysis efficiency in their hydrogen generator modules.
Input: saturated steam 40 kg/h @ 150°C and pressure: 3 bar(g)

British contribution: scaling up electrolysis to 100 MW

Bauablauf GeoCollect-Erdwärme-Absorber-System

[geocollect.de] – Company site
[ecoconcepts.eu] – Preisliste
[sonnewindwaerme.de] – Effizienter Erdwärmekollektor mit geringem Platzbedarf

Hamburg Tests Thermal Storage of WindPower

The thermal store for wind energy, which is being developed in Hamburg, is a joint project between Siemens, Hamburg Energie and TUHH. The German Federal Ministry for Economic Affairs and Energy is funding the project.

Siemens-Gamesa will build a thermal energy storage of 1000 tonnes of rock fill, that at 600 degrees Celsius will provide 30 MWh electricity. This is the equivalent of the batteries of 50 e-vehicles.

[siemensgamesa.com] – Start of construction in Hamburg-Altenwerder: Siemens Gamesa to install FES heat-storage for wind energy

Nordex Awarded 180-MW Project in the Netherlands

Location: Wieringermeer, 60 km north of Amsterdam.
Substance: 50 N117/3600 turbines

[nordex-online.com] – Nordex Awarded 180-MW Project in the Netherlands
[wikipedia.org] – Nordex SA

Read more…

Vattenfall Orders 1 GW Wind Park from Siemens-gamesh

The largest offshore wind order of 2017: the three wind farms, Kriegers Flak in the Baltic Sea and Vesterhav Syd and Nord in the North Sea, have a total investment value of close to EUR 1.7 billion (SEK 16.5 billion).

[vattenfall.com] – Vattenfall Places Historically Large Wind Power Order
[4coffshore.com] – Vesterhav Nord/Syd Offshore Wind Farm
[offshorewind.biz] – Vattenfall Inks Danish Offshore Wind Contracts

Siemens, Airbus and Rolls Royce Aim at Hybrid Electric Plane by 2020

[reuters.com] – Siemens, Airbus, Rolls-Royce team up on hybrid-electric propulsion

Hans-Josef Fell – Das Tempo der Energiewende

German language video.

Hans-Josef Fell is one of the most important advocats of renewable energy in Germany. He was the man behind “feed-in tariffs”, introduced in Germany in 2000 and and set an example for the rest of the world.

Fell has bad news: the energy transition in Germany is stalling. Were in 2000, 7 GW of new capacity was installed, in the last few years it has fallen back to 1.5 GW. Big oil, coal and lignite producers are successful in slowing down the transition.

[wikipedia.org] – Hans-Josef Fell

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