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Refrigeration: the story on HearLore | HearLore
Refrigeration
The first commercial shipment of frozen meat from New Zealand to London in 1882 did more than just feed a distant empire; it fundamentally altered the geography of human settlement. Before this voyage, cities like Houston, Las Vegas, and Phoenix were largely uninhabitable due to their distance from natural waterways and the inability to transport perishable goods over long distances. The invention of the refrigerated rail car and the subsequent development of mechanical refrigeration allowed these arid regions to thrive by enabling the import of food and the export of local agriculture. This technological shift created what urban planner Lewis Mumford termed galactic cities, massive urban centers that exist solely because they can be cooled and fed from afar. Without the ability to move heat from one location to another, these modern metropolises would have remained desolate wastelands, proving that the history of civilization is inextricably linked to the history of cooling.
The Dangerous Birth of Cold
The early pioneers of artificial refrigeration often paid for their innovations with their lives or their sanity, as the first machines were terrifyingly volatile. In 1855, William Cullen created a small refrigerating machine that used diethyl ether to produce ice, but the technology remained a laboratory curiosity for decades. By the 1870s, inventors like James Harrison and John Gorrie were building commercial systems that used ammonia, sulfur dioxide, and methyl chloride, gases that were highly flammable and toxic. Commercial refrigerators in 1910 weighed between five and two hundred tons and were prone to catching fire, exploding, or leaking deadly gases into homes and factories. It was not until 1930, when Frigidaire synthesized Freon, a chlorofluorocarbon that was safer and cheaper, that the technology became viable for the average household. This shift dropped the price of a refrigerator from 275 dollars to 154 dollars, allowing ownership to exceed 50 percent of American households by 1940, but the safety of these early machines was a gamble that many were unwilling to take.
The Ice Kings and The Frozen Empire
Frederic Tudor, known as the Ice King, turned a losing proposition into a global empire by shipping ice from New England to the Caribbean and the southern United States in the early 19th century. Before 1830, few Americans used ice to refrigerate foods due to a lack of ice-storehouses and iceboxes, but Tudor's vision changed the landscape of commerce. He lost thousands of dollars initially, but eventually turned a profit by constructing icehouses in Charleston, Virginia, and Havana, Cuba, reducing ice wastage from 66 percent to 8 percent through better insulation. His success inspired others to enter the trade, and by the early 1830s, ice became a mass-market commodity, with prices dropping from six cents per pound to half a cent per pound. In New York City, consumption increased from 12,000 tons in 1843 to 100,000 tons in 1856, while Boston's consumption leapt from 6,000 tons to 85,000 tons during the same period. This ice trade created a cooling culture that paved the way for the acceptance of mechanical refrigeration, as the majority of people used ice and iceboxes to store dairy products, fish, meat, and even fruits and vegetables.
Common questions
When was the first commercial shipment of frozen meat from New Zealand to London?
The first commercial shipment of frozen meat from New Zealand to London occurred on the 15th of February 1882. This voyage was commissioned by William Soltau Davidson and marked the beginning of a global meat trade that reshaped economies and diets.
Who invented the first small refrigerating machine that used diethyl ether to produce ice?
William Cullen created the first small refrigerating machine that used diethyl ether to produce ice in 1855. This technology remained a laboratory curiosity for decades before inventors like James Harrison and John Gorrie built commercial systems in the 1870s.
What year did Frigidaire synthesize Freon to make refrigeration viable for households?
Frigidaire synthesized Freon, a chlorofluorocarbon that was safer and cheaper, in 1930. This development dropped the price of a refrigerator from 275 dollars to 154 dollars and allowed ownership to exceed 50 percent of American households by 1940.
When did Benjamin Franklin and John Hadley conduct their experiment on rapid cooling?
Benjamin Franklin and chemist John Hadley conducted their experiment on rapid cooling in 1758. They confirmed that the evaporation of highly volatile liquids could drive down the temperature of an object past the freezing point of water.
What year did President Franklin D. Roosevelt sign the executive order for the Rural Electrification Administration?
President Franklin D. Roosevelt signed the executive order for the Rural Electrification Administration on the 11th of May 1935. This order provided loans to fund electric infrastructure in rural areas, allowing 300,000 people to receive power in their homes within a few years.
When was the Montreal Protocol signed to curtail the use of synthetic refrigerants like Freon?
The Montreal Protocol was signed in 1987 to curtail the use of synthetic refrigerants like Freon. These refrigerants were found in the 1970s to be reacting with atmospheric ozone, leading to their regulation to protect against solar ultraviolet radiation.
The scientific foundation of modern refrigeration was laid in 1758 when Benjamin Franklin and chemist John Hadley collaborated on a project investigating the principle of evaporation as a means to rapidly cool an object. They confirmed that the evaporation of highly volatile liquids, such as alcohol and ether, could be used to drive down the temperature of an object past the freezing point of water. They conducted their experiment with the bulb of a mercury thermometer as their object and with a bellows used to quicken the evaporation, lowering the temperature of the thermometer bulb to 14 degrees Fahrenheit while the ambient temperature was 50 degrees Fahrenheit. Franklin wrote, From this experiment, one may see the possibility of freezing a man to death on a warm summer's day. This early understanding of thermodynamics led to the development of the vapor-compression cycle, which was first described mathematically by Sadi Carnot in 1824 as a heat engine. The cycle involves a circulating refrigerant that enters the compressor as a vapor, is compressed to a higher temperature, and then travels through a condenser to cool and condense into a liquid, before passing through an expansion valve to create a cold mixture that absorbs heat from the space being refrigerated.
The Meat That Changed the World
The first successful shipment of frozen sheep carcasses from Port Chalmers in Dunedin, New Zealand, to London in 1882 marked the beginning of a global meat trade that reshaped economies and diets. William Soltau Davidson, an entrepreneur who had emigrated to New Zealand, commissioned the Dunedin to be refitted with a compression refrigeration unit for meat shipment, and on the 15th of February 1882, the ship sailed for London with what was to be the first commercially successful refrigerated shipping voyage. The Times commented that such a triumph over physical difficulties would have been incredible, even unimaginable, a very few days ago. Within five years, 172 shipments of frozen meat were sent from New Zealand to the United Kingdom, of which only 9 had significant amounts of meat condemned. This breakthrough led to a broader meat and dairy boom in Australasia and South America, with the industry rapidly expanding to Australia, Argentina, and the United States. The frozen meat trade created a market that allowed farmers to specialize in specific crops and livestock, leading to an economic boom in New Zealand by the mid 1890s and transforming the agricultural landscape of the United States.
The Silent Revolution of Rural America
The electrification of rural America in the 1930s was a pivotal moment that allowed refrigeration technology to expand on the farm, increasing output per person and transforming the lives of millions. In the early 1930s, 90 percent of the urban population of the United States had electric power, in comparison to only 10 percent of rural homes. Power companies did not feel that extending power to rural areas would produce enough profit to make it worth their while, but President Franklin D. Roosevelt signed an executive order on the 11th of May 1935, called the Rural Electrification Administration, which provided loans to fund electric infrastructure in the rural areas. In just a few years, 300,000 people in rural areas of the United States had received power in their homes. This electrification dramatically improved working conditions on farms and had a large impact on the safety of food production, as refrigeration systems were introduced to the farming and food distribution processes, helping in food preservation and keeping food supplies safe. As a result, United States farmers quickly became the most productive in the world, and entire new food systems arose, allowing for the shipment of perishable commodities throughout the United States.
The Hidden Cost of the Cold
The widespread adoption of refrigeration has had profound and often unintended consequences on human health and the environment, from the rise of gastric cancer to the depletion of the ozone layer. The introduction of refrigeration allowed for the hygienic handling and storage of perishables, promoting output growth, consumption, and the availability of nutrition, but it also led to a 1.7 percent increase in dairy consumption and overall protein intake by 1.25 percent annually in the US after the 1890s. Recent studies have shown a negative relationship between the number of refrigerators in a household and the rate of gastric cancer mortality, suggesting that refrigeration has contributed to increased adult stature through improved nutrition. However, the synthetic refrigerants developed in the late 1920s, such as Freon, were found in the 1970s to be reacting with atmospheric ozone, an important protection against solar ultraviolet radiation, leading to their use being curtailed in the Montreal Protocol of 1987. The environmental cost of these early refrigerants has spurred research into new technologies, including magnetic refrigeration and elastocaloric cooling, which promise to be more energy efficient and environmentally friendly.
The Future of Cooling
The future of refrigeration lies in the development of new technologies that can cool without harming the environment or consuming excessive energy, such as magnetic refrigeration and elastocaloric cooling. Magnetic refrigeration, or adiabatic demagnetization, is a cooling technology based on the magnetocaloric effect, an intrinsic property of magnetic solids, where a strong magnetic field is applied to the refrigerant, forcing its various magnetic dipoles to align and putting these degrees of freedom of the refrigerant into a state of lowered entropy. Elastocaloric refrigeration is another potential solid-state refrigeration technique that uses super elastic materials, which undergo a temperature change when experiencing an applied mechanical stress, providing a non-toxic source of emission free refrigeration. These technologies are still in the research phase, but they offer the promise of a future where cooling is both efficient and sustainable, allowing humanity to continue to thrive in the galactic cities of the 21st century without the environmental costs of the past.