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Tag: heatwave

Sustainable Cooling: Electrocaloric Cooling Breakthrough

Posted on by dishanth
Sustainable Cooling: Electrocaloric Cooling Breakthrough

As heatwaves intensify across the globe, the demand for air conditioning and refrigeration skyrockets. The ballooning demand for cooling strains energy infrastructure and escalates emissions from vapor compression systems. These conventional refrigerators and AC units rely on greenhouse gases and inefficient mechanical compressors that have reached their efficiency limits. With little room for improvement, vapor compression technology cannot sustainably shoulder doubling cooling demands. Scientists urgently search for climate-friendly innovations before the warming world overheats.

In a breakthrough discovery, researchers at the Luxembourg Institute of Science and Technology (LIST) pioneer a radically different cooling approach harnessing the electrocaloric cooling effect. This phenomenon describes particular ceramic materials that heat up or cool down when electric fields flip on and off. By cleverly leveraging this conductivity toggle, the LIST team designed an assembly that can pump heat without noisy, energy-draining compressors.

Electrocaloric cooling is a fascinating phenomenon where certain materials experience a reversible temperature change when an electric field is applied. In simpler terms, you can directly use electricity to manipulate their temperature, creating a cooling effect. This opens up exciting possibilities for energy-efficient and environmentally friendly cooling technologies.

The regenerative system developed by LIST alternates layers of electrocaloric capacitors with liquid coolant. Switching an electric field pulls heat from the fluid into the capacitors, cooling the system. Cutting voltage then dissipates the heat, so the cycle repeats. The smooth back-and-forth between hot and cold replaces high-maintenance mechanical parts with solid-state reliability. Scientists calculate that electrocaloric cooling efficiency leapfrogs vapor compression refrigeration by directly shuffling heat instead of wasting effort compressing refrigerants.

Since fluids naturally stratify by temperature, no added energy input is required to cycle hot and cold. The passive electrocaloric cooling generator minimizes electricity demands by exploiting thermodynamics rather than fighting against them. With game-changing energy savings over traditional refrigerator designs, this electrocaloric cooling technology paves the way for truly sustainable cooling.

Seeking real-world integration, LIST researchers collaborate with manufacturing partners to develop prototypes. The original discovery featured a single electrocaloric part, which limited heat transfer speed. The current regenerator assembly overcame this by interleaving many capacitors with parallel coolant channels. This boosts heat pumping capacity for powerful, real-world performance. Ongoing enhancements also aim to lower costs and extend operating lifetimes to enable widespread commercialization.

While the immediate goal focuses on eco-friendly refrigeration, the applications likely won’t stop there. Any process generating unwanted heat could benefit from electrocaloric cooling technology. Air conditioners, electronics cooling, industrial processes and even solar energy storage represent prospective opportunities. Because electrocaloric cooling systems thrive when miniaturized, microchip-level cooling also offers possibilities for computing breakthroughs.

For example, electrocaloric cooling films could provide on-chip cooling for high-performance computer processors, enabling faster computing speeds. Electrocaloric cooling systems can also be used to condense water vapor in air conditioning and dehumidification applications. This could allow environmentally-friendly refrigerants like water instead of HFCs to be used in vapor compression HVAC.

Additionally, the flexibility of electric-powered cooling lends well to renewable energy integration and smart grid load balancing. Electrocaloric heat pumps powered by wind or solar electricity during times of excess generation could store thermal energy for later dispatch while synchronizing supply and demand on the grid. With materials and system configuration innovations, electrocaloric cooling technologies show promise for revolutionizing thermal management across many sectors.

Despite enormous promise, unanswered questions remain regarding large-scale manufacturing and durability. However, early indications suggest the regenerator’s simple solid-state design will prove reliable over long stretches. By dodging complex mechanical components, the approach naturally steers towards sustainability. Cooling demand will only climb higher as climate change continues, but creative solutions like the LIST electrocaloric cooling regenerator offer hope we can innovate our way to a cooler future.

 

 

 

 

Source  Happy Eco News 

A heatwave known as the ‘blob’ may have killed a million birds – from just one species.

Posted on by dishanth
A heatwave known as the ‘blob’ may have killed a million birds – from just one species.
  • Many seabird numbers have declined in recent decades.
  • A marine heatwave in the Pacific killed an estimated one million common guillemots, according to a new report.
  • As climate change continues, the risk will only rise.

The common guillemot (known as the common murre in North America) breeds in both the Pacific and the Atlantic and is among the most abundant seabirds in the northern hemisphere. But like many other seabirds, its numbers have declined over the last few decades. Part of that decline is due to the marine environment – a seabird’s home and hunting ground – becoming increasingly unpredictable and difficult to survive in.

Between the summer of 2015 and the spring of 2016, a marine heatwave swept the northern Pacific Ocean that was hotter and lasted longer than any since records began in 1870. Known as “the blob”, the heatwave caused sea surface temperatures along the Pacific coast of North America to rise by 1-2°C. That may sound trivial, but it was enough to cause massive disruption in the marine ecosystem. The fish that common guillemots normally eat, such as herring, sardine and anchovy, either died or moved into cooler waters elsewhere, leaving the guillemots with little to eat. As a result, many birds starved.

 

6,540 common guillemot carcasses were found washed ashore in Alaska.
Image: David B. Irons, CC BY

 

A new study has revealed that one million common guillemots died due to the heatwave, and two thirds of them are thought to have been breeding adults. In a healthy population, about 95% of the breeding birds survive from one year to the next. But a bad year for adult survival causes big problems for the total population.

This is because guillemots live up to 40 years and mature slowly, producing a single egg per annual clutch. A female may start breeding at the age of seven and continue to breed each year until she dies. Most seabirds live similar lives because the food on which they rear their offspring is often a long way from land. Ferrying food back to the breeding colony is what limits how many offspring they can rear in any one year. Rearing just a single chick at a time makes sense, but if many adult birds of reproductive age die, there are no new chicks to replace those birds that are lost, and so the population declines.

 

Seabirds wrecked by ocean warming

Researchers based the estimate of one million dead guillemots on the numbers of dead or dying birds that washed up between California and the Gulf of Alaska. A total of 62,000 birds were found on 6,000km of coastline, but not all birds that die at sea end up on beaches. Previous studies have shown that the number of birds actually found dead needs to be multiplied by at least seven times – and possibly as much as several hundred times – to find the minimum estimate of the total numbers dead. That means that “one million dead seabirds” might actually be a conservative guess.

According to the new study, breeding populations in the Gulf of Alaska suffered a 10-20% decrease in numbers. Complete breeding failure, where birds either failed to lay eggs or failed to rear any chicks, was reported at 22 regularly monitored guillemot colonies in Alaska during the breeding seasons of 2015, 2016 and 2017. Complete breeding failure is extremely unusual among guillemots and it’s a clear sign that food is in extremely short supply.

 

The marine temperatures broke records during the heatwave.
Image: NOAA

 

The appearance of unusually high numbers of dead birds washed up on the shoreline is referred to as a “wreck”. Wrecks of common guillemots and related species such as puffins have been known about for many years. These population crashes may be a regular aspect of guillemot biology, but this one was far larger and over a much wider geographic area than any wreck seen before.

In most cases, wrecks are the result of persistent stormy conditions, disrupting the availability of fish on which seabirds like guillemots and puffins depend. When seas are rough and the weather harsh, the increased energy demands can kill many birds. The most recent wreck in the UK and western Europe occurred in the spring of 2014, and it killed at least 50,000 birds, mainly common guillemots and Atlantic puffins.

The common guillemot populations in the Pacific and western Europe will probably recover from both of these recent wrecks, providing there’s no further turmoil, but there’s no room for complacency. The only way scientists will know if populations have recovered is by monitoring the birds. It’s an activity that is generally regarded as the lowest form of scientific endeavour, but one that’s absolutely vital in a world of declining wildlife.

 

Professor Tim Birkhead and Dr Jess Meade on Skomer in Wales, 2012.
Image: Tim Birkhead

 

I’ve been studying and monitoring the number of common guillemots on Skomer Island, Wales since 1972. In that time, I’ve realised how essential this work is to understanding how guillemot populations work. Beach counts of dead seabirds allow scientists to detect unusual events, but these counts are meaningless without information on the overall size of the population. Without regular monitoring of seabird colonies on North America’s west coast, the researchers wouldn’t have known what proportion of the total population died, and would have missed the total breeding failures in the Alaskan colonies.

The North Pacific common guillemot wreck was unprecedented for the sheer numbers of birds killed, and the vast region over which it occurred. But the marine heatwave that caused it may be just a taste of what is to come for seabirds around the world as climate change accelerates.

 

 

Written by

Tim Birkhead, Emeritus Professor of Zoology, University of Sheffield

This article is published in collaboration with The Conversation.

The views expressed in this article are those of the author alone and not the World Economic Forum.

Australia’s bushfires have pumped out half a year’s CO2 emissions.

Posted on by dishanth
Australia’s bushfires have pumped out half a year’s CO2 emissions.
  • Australian CO2 emissions have surged by 250 million tonnes as a result of bushfires in New South Wales and Queensland.
  • Vegetation vital for absorbing CO2 is being destroyed by the blazes.
  • Experts say climate change is increasing the frequency and severity of the fires.

The east coast of Australia is burning. And as bushfires rip through everything in their path, they are generating CO2 emissions that pose a long-term threat to the world.

NASA data, supplied to Guardian Australia, shows that since August fires in New South Wales and Queensland have increased Australia’s annual emissions by 250 million tonnes – that’s half the country’s total emissions in 2018.

Australia is in the grip of a severe heatwave, with forecasters predicting the country’s highest-ever temperature of 50.7°C could soon be exceeded.

 

Temperatures around Australia.
Image: Australian Government Bureau of Meteorology

 

So far, the fires have killed six people, destroyed hundreds of homes, and consumed 2.7 million hectares of countryside, wiping out plant life that is vital for absorbing future CO2 emissions. The cost of the damage has already reached $100 million.

 

Air quality

More than 2,000 firefighters have been tackling the bushfires but fire chiefs say a prolonged drought has made the task much harder.

 

Bushfire at Mount Tomah, New South Wales in December 2019.
Image: Reuters

 

Sydney has recorded air quality 22 worse than standard levels as bushfire smoke has created a smog that has caused respiratory problems for residents. Actor Sam Neill reported smelling the fires at 39,000 feet while his flight was still hundreds of miles from Sydney.

 

 

Bushfires are common in this region of Australia during the summer and autumn, but this year the blazes have arrived early and with unexpected ferocity. The country’s Bureau of Meteorology says climate change is influencing the frequency and severity of dangerous fires.

 

Smog caused by bushfires in the Blue Mountains envelops Sydney.
Image: REUTERS/Stephen Coates

 

The extreme weather has prompted renewed calls for climate action by the Australian government. In response to the crisis, New South Wales is reported to be planning new climate targets, reducing emissions by 35% by 2030, compared to a national target of a 26% cut.

 

Tackling climate change

Australia was ranked 43rd out of 115 nations in the World Economic Forum’s 2019 Energy Transition Index because of its heavy dependence on coal for electricity generation.

However, there are ambitious plans to harness the country’s abundant sunshine to generate renewable energy for export. Plans have been announced to build a huge solar farm, covering 15,000 hectares in the Northern Territory, to supply power to Singapore.

 

Burnt-out cars left behind by the Australian bushfires.
Image: Reuters/Darren Pateman

 

In the Pilbara region of Western Australia an even larger green energy project is under way. The Asian Renewable Energy Hub plans to use wind combined with solar to generate up to 15 gigawatts of electricity at what backers say will be the world’s biggest wind/solar hybrid site.

By greening its industries and becoming a major exporter of renewable energy, Australia would be able to reduce its carbon emissions which, including its coal, oil and gas exports, now account for 5% of the global total.

 

 

Written by

Douglas Broom, Senior Writer, Formative Content

The views expressed in this article are those of the author alone and not the World Economic Forum.