Roasting Coffee with the Rays of the Sun

Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)
Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)
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Roasting Coffee with the Rays of the Sun

Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)
Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)

Combining two of Italy's delights — coffee and sunshine — a couple of engineers in Rome have created an environmentally friendly way to roast coffee beans without electricity or gas.

Antonio Durbe and Daniele Tummei have spent almost six years building and perfecting their sunlight coffee roaster.

The result is a system that needs a piece of land about the size of half a tennis court and sunny weather to roast up to 50 kilograms (110 pounds) of coffee an hour.

The plant is run entirely by energy from the sun. Sunrays are concentrated by a set of mirrors on a coffee roaster and even the few electrical parts are powered by a small solar panel. Sensors controlled by a computer allow the mirrors to follow the sun throughout the day and focus its light on a rotating steel basket that contains the fresh coffee beans. The basket reaches peak temperatures of about 240-250 C (450-480 F), depending on the sun's brightness, and can roast the beans in 20 minutes.

The process isn't only environmentally friendly and economically convenient. According to Durbe and Tummei, it also better preserves the coffee’s aroma, giving it a richer flavor. Unlike conventional hot air ovens, which are typically gas-powered, the concentrated sunlight roasts the coffee without heating the air around it — by penetrating the grains in a more uniform way and without burning the exterior.

Naturally, the system does depend on good weather. On cloudy days or after sunset, coffee lovers need to turn elsewhere.

However, in sunny southern Italy, a plant with 40 mirrors is capable of roasting up to 30,000 kilograms (66,000 pounds) of coffee a year, saving about 60,000 kilowatt-hours of electricity, according to the inventors.

Their Purosole, or pure sun, coffee can be bought online, but the main goal of the inventors is selling their solar coffee roasting plants to small businesses who are sensitive to the environment. Right now, they are operating their plant in the garden of a friend.

The system can be put to other uses as well. At the end of a long work day, Durbe and Tummei place a grill in in front of the mirrors to prepare some delicious sunlight barbecue.



Downloads of DeepSeek's AI Apps Paused in South Korea Over Privacy Concerns 

People watch a TV reporting DeepSeek, a Chinese artificial intelligence startup, during a news program at the Seoul Railway Station in Seoul, South Korea, Monday, Feb. 17, 2025. (AP)
People watch a TV reporting DeepSeek, a Chinese artificial intelligence startup, during a news program at the Seoul Railway Station in Seoul, South Korea, Monday, Feb. 17, 2025. (AP)
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Downloads of DeepSeek's AI Apps Paused in South Korea Over Privacy Concerns 

People watch a TV reporting DeepSeek, a Chinese artificial intelligence startup, during a news program at the Seoul Railway Station in Seoul, South Korea, Monday, Feb. 17, 2025. (AP)
People watch a TV reporting DeepSeek, a Chinese artificial intelligence startup, during a news program at the Seoul Railway Station in Seoul, South Korea, Monday, Feb. 17, 2025. (AP)

DeepSeek, a Chinese artificial intelligence startup, has temporarily paused downloads of its chatbot apps in South Korea while it works with local authorities to address privacy concerns, South Korean officials said Monday.

South Korea’s Personal Information Protection Commission said DeepSeek’s apps were removed from the local versions of Apple’s App Store and Google Play on Saturday evening and that the company agreed to work with the agency to strengthen privacy protections before relaunching the apps.

The action does not affect users who have already downloaded DeepSeek on their phones or use it on personal computers. Nam Seok, director of the South Korean commission’s investigation division, advised South Korean users of DeepSeek to delete the app from their devices or avoid entering personal information into the tool until the issues are resolved.

DeepSeek got worldwide attention last month when it claimed it built its popular chatbot at a fraction of the cost of those made by US companies. The resulting frenzy upended markets and fueled debates over competition between the US and China in developing AI technology.

Many South Korean government agencies and companies have either blocked DeepSeek from their networks or prohibited employees from using the app for work, amid worries that the AI model was gathering too much sensitive information.

The South Korean privacy commission, which began reviewing DeepSeek’s services last month, found that the company lacked transparency about third-party data transfers and potentially collected excessive personal information, Nam said.

Nam said the commission did not have an estimate on the number of DeepSeek users in South Korea. A recent analysis by Wiseapp Retail found that DeepSeek was used by about 1.2 million smartphone users in South Korea during the fourth week of January, emerging as the second-most-popular AI model behind ChatGPT.