Robotic kites monitor greenhouse gas emissions
CategoriesSustainable News

Robotic kites monitor greenhouse gas emissions

Spotted: Wastewater treatment systems and rice farming produce a variety of greenhouse gasses (GHG), such as methane and nitrous oxide, that have a greater warming potential than carbon dioxide over the short term. Identifying when and where high volumes of these GHGs are emitted is essential if we are to tackle them, ensure reductions targets are being met, and mitigate climate change. However, there are few projects aimed at monitoring such emissions in an accurate and affordable way.

A new project at Surrey University hopes to change this with new, lightweight wireless gas sensors. The sensors will be attached to helium kites flown by autonomous robots and used to monitor the level and direction of emissions.

The research will involve several departments from across the university, such as fluid dynamics and robotics, and will incorporate skills such as data analysis. The sensors will be built by university spin-out Surrey Sensors, while Allsopp Helikites will provide the helium balloons. The technology will be tested in a variety of locations, including Thames Water treatment works and rice paddies in Spain.

The work is supported by a £620,000 (around €719,000) grant as one of 13 projects nationwide to be funded by a £12 million investment (around €13.9 million) from UK Research and Innovation’s Natural Environment Research Council, the Department for Environment and Rural Affairs (Defra), and Innovate UK. The funding seeks to support UN Sustainable Development Goal 13 — climate action.

Tackling methane emissions is the subject of a number of recent innovations spotted by Springwise, including a seaweed-based feed supplement that could reduce methane emissions from livestock and more sustainable methods for rice farming.

Written By: Lisa Magloff

Reference

Underwater kites harness energy from predictable tidal currents
CategoriesSustainable News

Underwater kites harness energy from predictable tidal currents

Spotted: Tidal energy is a source of renewable power in which energy is harnessed from either the natural rise and fall of ocean tides or the movement of tidal or ocean currents. Although not yet widely used, tidal energy has a huge potential for future electricity generation. Unlike wind and solar energy, tidal streams and ocean currents are predictable and continuous. First-generation tidal technologies tend to require strong tidal flows in order to be commercially viable. However, a new approach could greatly expand the energy potential of tidal flows.

Startup Minesto has developed a ‘kite’ with a turbine that ‘flies’ underwater to generate electricity from predictable tidal streams and ocean currents. The device is attached to a tether and uses the hydrodynamic lift force created by the underwater current to move. An onboard control system autonomously steers the kite in a figure-of-eight trajectory. This motion pulls the turbine through the water at a water flow several times higher than the actual stream speed – and this faster speed generates more power.

The tether contains cables for communication and power and is connected to the seabed foundation by a connector that can be easily latched and unlatched for installation and recovery. Electricity generated is sent to the grid using a power cable within the tether.

Minesto claims that its use of a wing design and its underwater ‘flight’ makes this technology more efficient than other tidal energy technologies. On its website, the company explains that, “This means that when the kite multiplies the relative speed which the turbine is pushed through the water, the electricity produced by the generator is several times greater compared to if the turbine would be stationary. By adding this step of energy conversion, Minesto expands the global tidal and ocean currents’ extractable potential.”

Other recent renewable energy innovations that harness the flow of water include a floating platform that harvests energy from rivers and a new design that could allow wave energy to be harvested from the open ocean.

Written By: Lisa Magloff

Reference