William Cullen at the University of Glasgow demonstrated the first artificial refrigeration system in the year 1748. However, he never used his discovery for practical purposes. In the year 1805, US inventor Oliver Evans, designed the first refrigeration machine that didn't use liquid and instead used vapor to cool.
Then, what was the first refrigerant?
The first practical vapour-compression refrigeration system was built by James Harrison, a British journalist who had emigrated to Australia. His 1856 patent was for a vapour-compression system using ether, alcohol, or ammonia.
Artificial refrigeration began in the mid-1750s, and developed in the early 1800s. In 1834, the first working vapor-compression refrigeration system was built. The first commercial ice-making machine was invented in 1854. In 1913, refrigerators for home use were invented.
We don't know about the inventor of the comb yet. The earliest use of the comb can be traced to as far back as 5,000 years ago in Persia. In fact, primitive versions of the comb have been found throughout history by archaeologists. The ancient Egyptians carved out combs among other remnants of the emerging cultures.
The patent for this original refrigerator was granted in 1802 to a gentleman named Thomas Moore, a farmer, inventor, surveyor, engineer and entrepreneur from Brookeville, Maryland.
Alice H. Parker was an African-American inventor who filed the first United States patent for the precursor to a central heating system. Parker was highly educated compared to most Americans during the early 1900s.
Electronic television was first successfully demonstrated in San Francisco on Sept. 7, 1927. The system was designed by Philo Taylor Farnsworth, a 21-year-old inventor who had lived in a house without electricity until he was 14.
The company Spencer was working for, Raytheon, then filed a patent on October 8, 1945 for a microwave cooking oven, eventually named the Radarange. This first commercially produced microwave oven was about 6 feet tall and weighed around 750 pounds.
Corrine Dufour of Savannah, Georgia received two patents in 1899 and 1900 for another blown air system that seems to have featured the first use of an electric motor. In 1901 powered vacuum cleaners using suction were invented independently by British engineer Hubert Cecil Booth and American inventor David T. Kenney.
Oliver Evans. Oliver Evans, (born Sept. 13, 1755, near Newport, Del. [U.S.]—died April 15, 1819, New York, N.Y.), American inventor who pioneered the high-pressure steam engine (U.S. patent, 1790) and created the first continuous production line (1784).
The problem arises because of all the alternative spellings, "fridge" is the only one that preserves the pronunciation of the corresponding syllable in "refrigerator." If the letters "frig" were used, the outcome would be that the letters would equal the existing word "frig," which means a sexual act.
Modern refrigerators usually use a refrigerant called HFC-134a (1,1,1,2-Tetrafluoroethane), which does not deplete the ozone layer, instead of Freon. A R-134a is now becoming very uncommon in Europe. Newer refrigerants are being used instead. The main refrigerant now used is R-600a, or isobutane.
The vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. The above figure shows the objectives of refrigerators and heat pumps. The purpose of a refrigerator is the removal of heat, called the cooling load, from a low-temperature medium.
But it's unclear who invented the microscope. Some historians say it was Hans Lippershey, most famous for filing the first patent for a telescope. Other evidence points to Hans and Zacharias Janssen, a father-son team of spectacle makers living in the same town as Lippershey.
Josephine Garis Cochran
We use Air Conditioning to improve thermal comfort and indoor air quality. So we use "Freon gas" In AC, which is merely a marked namae for dichlorodifluoromethane. It adds to ozone depletion and thus the Global warming effects. because, when the CFC escape from the unit it quickly rises up to the ozone layer.