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Saudi Research Tests New Energy-Efficient Cooling System

KAUST's new cooling system
KAUST's new cooling system
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Saudi Research Tests New Energy-Efficient Cooling System

KAUST's new cooling system
KAUST's new cooling system

The King Abdullah University of Science and Technology (KAUST) has conducted observational experiments in the houses located inside the campus to create a new cooling system that consumes energy less than the currently used systems.

These experiments aim at testing the efficiency of the new system under different weather conditions in Saudi Arabia.

Air conditioning systems in use today typically achieve only 35–40 percent of the cooling possible for the amount of electricity they consume. As well as their principal task of cooling air, they remove moisture from the air by lowering its temperature to the level at which the water in it condenses. But this double step wastes a lot of energy.

A team led by Kim Choon Ng, professor of Environmental Science and Engineering at KAUST, has now devised a way to reduce the amount of energy consumed by decoupling the two processes.

Instead of dehumidifying air by cooling it, the system uses a more efficient process called adsorption. This binds the water in the air to the surface of a specially developed nanomaterial. Made of calcium chloride salt embedded in a silica gel lattice, this material can adsorb up to 20 times as much water as conventional silica gel in proportion to its weight.

Ng is now testing prototypes, and findings to date show an improvement in efficiency of 30–60 percent over conventional air conditioners. “This new type of air conditioner could offer a much-needed mean to slow down the increasing contribution of cooling systems to climate change,” says Kim Choon Ng.

In this new system, the proprietary adsorbent coats the coils of a mechanical vapor compressor, which cools the air the adsorbent has dehumidified in the manner of a conventional AC system. Air flow through the system is reversed and then reversed again in a period cycle to regenerate the saturated adsorbent.

Global consumption of air conditioning electricity, mainly generated from burning fossil fuels, has risen from 600 TWh in 1990 to 2,200 TWh in 2020, and based on current trends, could reach 6,300 TWh in 2050. By then, half of all electricity used by the world’s hottest countries, including Saudi Arabia, would be used just for keeping people cool.

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Forecasts Warn of Possible Winter Storms across US during Thanksgiving Week

A drone view shows a damaged area, following the passing of Hurricane Helene, in Asheville, North Carolina, US, September 29, 2024. (Reuters)
A drone view shows a damaged area, following the passing of Hurricane Helene, in Asheville, North Carolina, US, September 29, 2024. (Reuters)
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Forecasts Warn of Possible Winter Storms across US during Thanksgiving Week

A drone view shows a damaged area, following the passing of Hurricane Helene, in Asheville, North Carolina, US, September 29, 2024. (Reuters)
A drone view shows a damaged area, following the passing of Hurricane Helene, in Asheville, North Carolina, US, September 29, 2024. (Reuters)

Forecasters through the US issued warnings that another round of winter weather could complicate travel leading up to the Thanksgiving holiday, while California and Washington state continue to recover from storm damage and power outages.
In California, where a person was found dead in a vehicle submerged in floodwaters on Saturday, authorities braced for more precipitation while grappling with flooding and small landslides from a previous storm. Thousands in the Pacific Northwest remained without power after multiple days in the dark.
The National Weather Service office in Sacramento, California, issued a winter storm warning for the state's Sierra Nevada for Saturday through Tuesday, with heavy snow expected at higher elevations and wind gusts potentially reaching 55 mph (88 kph). Total snowfall of roughly 4 feet (1.2 meters) was forecast, with the heaviest accumulations expected Monday and Tuesday.
The Midwest and Great Lakes regions will see rain and snow Monday and the East Coast will be the most impacted on Thanksgiving and Black Friday, forecasters said.
A low pressure system is forecast to bring rain to the Southeast early Thursday before heading to the Northeast. Areas from Boston to New York could see rain and strong winds, with snowfall possible in parts of northern New Hampshire, northern Maine and the Adirondacks. If the system tracks further inland, there could be less snow and more rain in the mountains, forecasters said.
Deadly 'bomb cyclone’ on West Coast Earlier this week, two people died when the storm arrived in the Pacific Northwest. Hundreds of thousands lost power, mostly in the Seattle area, before strong winds moved through Northern California. A rapidly intensifying “ bomb cyclone ” that hit the West Coast on Tuesday brought fierce winds that resulted in home and vehicle damage.
Rescue crews in Guerneville, California, recovered a body inside a vehicle bobbing in floodwaters around 11:30 a.m. Saturday, Sonoma County Sheriff’s Deputy Rob Dillion said, noting the deceased was presumed to be a victim of the storm but an autopsy had not yet been conducted.
Santa Rosa, California, saw its wettest three-day period on record with about 12.5 inches (32 centimeters) of rain by Friday evening, the National Weather Service in the Bay Area reported. Vineyards in nearby Windsor, California, were flooded on Saturday.
Tens of thousands without power in Seattle area Some 80,000 people in the Seattle area were still without electricity after this season’s strongest atmospheric river, a long plume of moisture that forms over an ocean and flows over land.
The power came back in the afternoon at Katie Skipper’s home in North Bend, about 30 miles (50 kilometers) east of Seattle, after being out since Tuesday. She was tired from taking cold showers, warming herself with a wood stove and using a generator to run the refrigerator, but Skipper said those inconveniences paled in comparison to the damage other people suffered, such as from fallen trees.
“That’s really sad and scary,” she said.
Northeast gets needed precipitation Another storm brought rain to New York and New Jersey, where rare wildfires have raged in recent weeks, and heavy snow to northeastern Pennsylvania. The precipitation was expected to help ease drought conditions after an exceptionally dry fall.
“It’s not going to be a drought buster, but it’s definitely going to help when all this melts,” said Bryan Greenblatt, a National Weather Service meteorologist in Binghamton, New York.
Heavy snow fell in northeastern Pennsylvania, including the Pocono Mountains. Higher elevations reported up to 17 inches (43 centimeters), with lesser accumulations in valley cities including Scranton and Wilkes-Barre. Less than 80,000 customers in 10 counties lost power.
Precipitation in West Virginia helped put a dent in the state’s worst drought in at least two decades and boosted ski resorts preparing to open their slopes in the weeks ahead.