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Sustainable Cooling: Electrocaloric Cooling Breakthrough

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 

What does true sustainability look like in the hotel industry?

What does true sustainability look like in the hotel industry?

In a bid to become more environmentally sustainable, Raffles Hotel Singapore has reimagined its signature drink: the Singapore Sling, a fruity gin-based cocktail dating back to the 1900s.

In 2018, the 5-star ultra luxury hotel partnered with spirits company Proof & Company’s ecoSPIRITS programme to transform the drink’s life cycle. Using a closed-loop distribution system, they were able to eliminate several thousand kilograms of packaging waste annually. Furthermore, for every 25 Singapore Slings served, a native tree is planted in Kalimantan and Sumatran rainforests.

According to consultancy firm Deloitte’s calculations, every glass of Singapore Sling now emits 200 fewer grams of carbon dioxide than before.

Raffles Hotel is not the only establishment raising its sustainability game. In 2019, Marriott International, the world’s largest hotel chain, phased out single-use plastic toiletry bottles in favour of larger pump dispenser bottles. Meanwhile, Hilton committed to reducing food waste by 50 per cent by 2030.

Many of these initiatives are driven by consumer demand for more sustainable accommodation, which has skyrocketed in recent years. According to Booking.com’s 2021 Sustainable Travel Report, 81 per cent of travellers said that they want to stay in sustainable accommodation in the upcoming year, a significant jump from 62 per cent in 2016.

Local hospitality and tourism institutions are also putting greater pressure on hotels to decarbonise. In March 2022, the Singapore Hotel Association (SHA) and Singapore Tourism Board (STB) launched a Hotel Sustainability Roadmap which urged establishments to reduce emissions by 2030 and reach net-zero emissions by 2050.

“There’s just more pressure all around now,” said Eric Ricaurte, founder of hospitality consulting firm Greenview. “While previously we only saw incremental changes like reusing linen towels, hotels are now also paying attention to issues like energy and carbon. We’re seeing sustainability appear on the radars of hotels everywhere.”

But amidst hotels’ greater focus on sustainability, how many of these changes are greenwashing — initiatives designed to mislead guests and present a false environmentally responsible public image?

 

There is some great work happening, but there’s a lot of PR-driven hot air too.

– Tim Williamson, customer director, Responsible Travel

 

Greenwashing, or genuine change?

There’s a mix of both, says Tim Williamson, customer director of Responsible Travel, an activist company seeking to design conscious trips.

“There is some great work happening, but there’s a lot of PR-driven hot air too,” said Williamson. “For example, while some hotels have set net zero targets, they may ‘hide behind’ carbon offsetting to reach these goals, which is not the same as a real reduction in their emissions.”

According to Ricaurte, another form of greenwashing is when hotels offer an asymmetrical representation of their environmental impact. He pointed to some hotels which may have removed plastic straws, but still use large amounts of plastic in other aspects of their operations.

To identify hotels that genuinely care about sustainability, Ricaurte said guests could consider whether the hotel pays attention to both lower-hanging fruit — like providing plant-based options on their restaurant menus — as well as formal certifications.

There is currently a growing list of globally-recognised sustainability certifications for the hotel sector, including the Green Key eco-label, Green Globe, as well as Booking.com’s recently launched Travel Sustainable Badge. But Williamson says not all certifications are created equally. Less credible schemes may only require hotels to undertake a self-assessment, rather than be evaluated by an independent third party.

“There is also the issue of what is relevant,” said Williamson. “Reducing water consumption may be less of a priority for a hotel in Scotland than for a hotel in a drought-ridden area of southern Spain, but many green certification schemes don’t make this distinction. This means businesses may have a green badge but still be failing to address the challenges most pressing in their local area.”

Rather than relying solely on certifications, Williamson instead encouraged consumers to “look behind the labels” and ask for written policies and specific examples.

“What percentage of employees are local, and do they receive a fair wage? How much of the produce is sourced from local suppliers? What are they doing to help protect and restore nature, and how are they cutting food waste? Don’t take all labels at face value,” he said.

 

Transparency trade-offs

While green marketing is on the rise, not all hotels have opted to integrate sustainability into their branding. Raffles Hotel Singapore, for example, features little about sustainability on its website.

“We think that sustainability and saving the planet shouldn’t be used as marketing highlights,” explained general manager Christian Westbeld. “They should be something that you really live by. We all have to do the right thing.”

Westbeld says that when the hotel closed its doors for extensive restoration from December 2017 to August 2019, sustainability was high on the agenda. The environmental footprint was taken into consideration in all aspects, from the plumbing systems to kitchen equipment, and even the linen in each guest suite.

“For example, the windows in each suite are now double glazed to better retain cold temperatures, therefore encouraging guests to use air-conditioning for shorter periods of time,” said Westbeld.

However, most of this information is not highlighted to travellers on Raffles Hotel’s marketing platforms.

Dr Victor Nian, Chief Executive Officer of Singapore-based think tank Centre for Strategic Energy and Resources, said such an approach eliminates the issue of greenwashing entirely. However, he cautioned that transparency is also very important.

“If a hotel publishes a sustainability report on their website, it’s often a positive sign that they are trying to do something. It also gives you a chance to compare sustainability among different hotels,” he said, adding that such reports are often endorsed by a verified body.

“But if they don’t publish anything, people won’t know what they are doing at all,” he said.

Laura Houldsworth, Asia Pacific managing director at Booking.com, an online travel agency, shared similar views: “We think hotels should be encouraged to share their sustainability initiatives. We believe in educating travellers and empowering them with the right knowledge, so they know how to avoid these pitfalls.”

 

An uphill battle

Westbeld admits it can be difficult to prioritise sustainability as an ultra luxury destination.

“We will never compromise on service standards and guest experience,” he said. “For example, we won’t openly recommend guests not to change sheets. It is a guest’s choice — they can approach us and say they only want to change it every other day. But we don’t compromise on hygiene and comfort.”

Hotels also face constraints that they may not be able to immediately address.

According to Ricaurte, one of the biggest challenges in reducing emissions is the design of the building itself, since the key moments when those design decisions are made may not have factored in sustainability. This results in the hotel lagging behind on building sustainability standards.

Hotels are often also constrained by their location and local energy grid.

“In Singapore, if the electricity grid is mostly powered by fossil fuels, there’s very little hotels can do to decarbonise that,” said Dr Nian.

While there are still ways hotels can reduce their energy consumption, such as improving the air-conditioning efficiency or exploring rooftop solar, Dr Nian said that these measures often have limited impact in driving down absolute emissions. Hotels may also be reluctant to implement these changes due to cost barriers, he added.

Ultimately, as demand for sustainability grows, the notion of luxury may need to be redefined for travellers and hoteliers alike to meet their sustainability goals, says Responsible Travel’s Williamson.

“Luxury doesn’t have to be all about air-con and all-inclusives. It can also be about bespoke, authentic experiences and great personal service,” he said. “It could be a small, locally-owned hotel with its own vegetable garden and hosts who know the best off-the-beaten-track spots for hiking, food and culture. Or a small ship cruise which really gets you into the nooks and crannies of a place, instead of a colossal liner.”

“High-value, low-impact tourism can benefit local communities and important conservation work too. Everyone wins.”

 


 

Source Eco Business