Technology

My colleagues and I have developed an artificial intelligence system that helps buildings shift their energy use to times when the electric grid is cleaner. I’m an engineer who studies and develops smart buildings. My lab created Merlin, which learns how people use energy in their homes and adjust energy controls like thermostats to meet their needs while at the same time minimizing the impact on the grid. The system can learn on one set of buildings and occupants and be used in buildings with different controls and energy use patterns. We dubbed it Merlin after King Arthur’s legendary magician to reflect the magical nature of the system: It automatically collects data on how people use energy in their homes and identifies opportunities to charge and discharge home battery storage. And it does so in a way that you always have power for whatever you need. So your air conditioning is always available, but at the same time it reduces the strain on the grid – for...

China has unveiled an action plan on the green development of data centers, specifying a set of targets to accelerate the low-carbon transition of the sector. By 2025, the average power usage effectiveness (PUE) of data centers, a metric for energy efficiency, will be lowered to less than 1.5, according to the plan jointly issued on Tuesday by the National Development and Reform Commission, the Ministry of Industry and Information Technology and two central government agencies. The plan also aims to increase the utilization rate of renewable energy in data centers by 10 percent annually. As an important infrastructure for development of new quality productive forces, data centers are among the sectors where energy use grow rapidly in China. It is expected that data centers’ power usage in the country will climb by 15 percent annually. The action plan proposed that by the end of 2030, data centers across the country will see their average PUE, and ener...

The future of automobiles is electric, but many people worry about the safety of today’s electric vehicles. Public opinion about EV crash safety often hinges on a few high-profile fire incidents. Those safety concerns are arguably misplaced, and the actual safety of EVs is more nuanced. I’ve researched vehicle safety for more than two decades, focusing on the biomechanics of impact injuries in motor vehicle crashes. Here’s my take on how well the current crop of EVs protects people: The burning question EVs and internal combustion vehicles undergo the same crash-testing procedures to evaluate their crashworthiness and occupant protection. These tests are conducted by the National Highway Safety Administration’s New Car Assessment Program and the Insurance Institute for Highway Safety. These analyses use crash test dummies representing midsize male and small female occupants to evaluate the risk of injuries. The tests can evaluate fire hazard either ca...

If you’ve looked in your utility drawer lately, you may have noticed the various shapes, sizes and types of batteries that power your electronic devices. First, there are the round, non-rechargeable button cells for your watches and small items. There’s also the popular AA and AAA cylindrical batteries for calculators, clocks and remotes. Then you have the rechargeable lithium-ion batteries in your laptops and phones. And don’t forget about the lead-acid battery in your car. I’m a professor who studies batteries and electrochemistry. To understand why batteries come in many different sizes and shapes – and serve many purposes – look to the past, at how batteries originated and how they have developed over the years. The first batteries were made in the 1800s, and they were quite simple. One of the first demonstrations was a series of metal discs soaked in brine, which Italian scientist Alessandro Volta found created an electric current. The f...

Rechargeable batteries are great for storing energy and powering electronics from smartphones to electric vehicles. In cold environments, however, they can be more difficult to charge and may even catch on fire. I’m a mechanical engineering professor who’s been interested in batteries since college. I now lead a battery research group at Drexel University. In just this past decade, I have watched the price of lithium-ion batteries drop as the production market has grown much larger. Future projections predict the market could reach thousands of GWh per year by 2030, a significant increase. But, lithium-ion batteries aren’t perfect – this rise comes with risks, such as their tendency to slow down during cold weather and even catch on fire. Behind the Li-ion battery The electrochemical energy storage within batteries works by storing electricity in the form of ions. Ions are atoms that have a nonzero charge because they have either too many or not eno...