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HEATED AIR BALLOON PRINCIPLE
In 1783, two French brothers while conducting indoor experiments in Annonay, France after getting inspired by watching smoke rise and clothes billow over a fire invented the world's first practical hot air balloonIn 1783, two French brothers while conducting indoor experiments in Annonay, France after getting inspired by watching smoke rise and cloth...- In 2024, NTU coated roofs, walls, and roads across a Singapore industrial block: afternoon air fell by 2°C, and pedestrians felt up to 1.5°C cooler outdoorsIn Singapore, engineers have experimented with a groundbreaking coating designed to minimize heat absorption in urban settings. This innova...
- Philadelphia installed white roofs on about 340 low-income seniors’ homes from 2001–2003; ceiling temperatures fell 4–5°F, and air-conditioning electricity use fell by 560 kWh per yearIn Philadelphia, the initiative to paint roofs white resulted in a remarkable decrease in home temperatures and energy consumption. This co...
- Cambridge researchers made cellulose acetate films that absorbed less than 5% of sunlight; coated surfaces stayed about 5°C below the surrounding air without powerInnovative researchers have created a revolutionary cellulose acetate film that excels in passive cooling. By absorbing minimal sunlight wh...
- Penn State measured a green roof during a June 2002 heat spell; its membrane peaked near 30°C, while the uncovered roof surface climbed to nearly 70°CGreen roofs present a remarkable solution for enhancing temperature control in urban environments, effectively lowering surface temperature...
- In 2013, Robert Downey Jr. commissioned Nicolò Bini to create a Malibu Binishell with thin-shell concrete; nine years later, the 6,500-sq-ft home was completedRobert Downey Jr.'s unique guest house took nine years to complete. This unusual structure utilized a Binishell technique involving inflate...
- 16-year-old girl from Jhansi designed an air conditioner using just Rs 1800. It can reduce room temperature by 4-5 degrees in an hour, generates no electricity billsYoungsters in India have often come up with brilliant innovations which can help the people of India. A 16-year-old teenager from Jhansi ca...
- Sacramento researchers coated a retail store’s dark roof white in 2002. Its peak roof temperature fell by up to 42°C and air-conditioning energy use dropped 52%In 2002, Sacramento researchers coated a retail store’s dark roof with a reflective cool-roof coating. The roof’s peak surface temperature ...
- In Tucson, a 28,000-square-foot city roof got a white elastomeric coating; cooling energy fell 50–65%, saving over 400 million Btu and nearly $4,000 a yearCool roof coatings present an easy and efficient method to lower cooling bills during hot summer days. A Tucson city building illustrated i...
- A Berkeley Lab study compared two Fresno homes for a year; the reflective tile roof ran 13.8°C cooler on a summer day, cut cooling electricity by 26%, and peak demand by 37%In Fresno, California, a comparative analysis of two houses revealed the advantages of reflective tile roofing. The home adorned with this ...
- AT&T painted two Nevada telecom roofs white; roof surfaces cooled 35–40°F, reached 12°F below outdoor air, and two buildings saved about 0.5 kWh of electricity a dayA study explored how white roofs reduced energy costs for AT&T communication buildings. Researchers observed significant roof surface tempe...
- Silver Sands Middle School replaced gray shingles with reflective white metal; plenum temperature fell by over 25°F, and cooling energy in Portable 096 dropped by over 33%A recent study revealed that dark roofs on portable classrooms led to increased cooling costs. By switching to white metal roofing, energy ...
- A Fresno home replaced dark asphalt shingles with reflective concrete roof tiles; a Lawrence Berkeley study reported 26% lower annual cooling energy use and 37% lower peak-hour demandA recent study in Fresno demonstrated that reflective roofs could lower cooling energy consumption by an impressive twenty-six percent. Hom...
- In 1991, researchers coated a Merritt Island home’s green-gray shingle roof with reflective material; the shingles reached about 110°F after treatmentDark roofs tend to soak up heat from the sun, resulting in higher air conditioning demands and costs. Utilizing reflective roofing material...
- In 2001, researchers tested a white roof on a large Austin retail store; the study reported lower roof temperatures and an 11% reduction in cooling energy useA 2001 study in Austin demonstrated that white roofs lowered building temperatures significantly. This change reduced air conditioning ener...
- In 2018, a University of Hawaii study compared green and white roofs in Honolulu; the green roof was reported to have lower peak temperatures at the surface and nearby airA University of Hawaii graduate student tested green roofs against white ones. The green roof proved significantly cooler than the adjacent...
- In 2007, Oak Ridge built a roof with phase-change material between foil layers; attic temperatures fell about 22°F, with utility savings estimated at 8%Developed by Oak Ridge National Laboratory, innovative attic technology utilizing phase change materials has proven to lower attic temperat...
- 15-year-old builds flashlight powered by body heat: How her hollow aluminium tube generated electricity to keep an LED lit for more than 20 minutesA 15-year-old Canadian student built a battery-free flashlight that uses the temperature difference between a warm human palm and cooler ai...
- In 2025, Monash researchers developed a self-adaptive microporous ceramic; daytime cooling reached 19.5°C below ambient while nighttime overcooling was limited to 3.3°CScientists have unveiled an innovative ceramic designed for passive radiative cooling applications. This advanced material efficiently lowe...
- In 1995, Florida researchers coated a Cocoa Beach school roof white; over the following year, chiller energy use fell 10%, saving 13,000 kWh, while peak demand fell 35%A study conducted in Florida revealed that white roofs can drastically lower cooling costs, marking a significant achievement in the realm ...
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