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Vacuum coffee maker
A vacuum coffee maker brews coffee using two chambers where vapor pressure and gravity produce coffee. This type of coffee maker is also known as vac pot, siphon or syphon coffee maker, and was invented by Loeff of Berlin in the 1830s.
Since their invention, these devices have since been used in many parts of the world. While vacuum coffee makers generally were excessively complex for everyday use, they were prized for producing a clear brew, and were quite popular until the middle of the twentieth century. Vacuum coffee makers remain popular in some parts of Asia, including Japan and Taiwan.
Design and composition of the vacuum coffee maker varies. The chamber material is borosilicate glass, metal, or plastic, and the filter can be either a glass rod or a screen made of metal, cloth, paper, or nylon. The Napier Vacuum Machine by James Robert Napier, presented in 1840, was an early example of the vacuum brewing process. The Bauhaus interpretation of this device can be seen in Gerhard Marcks' Sintrax coffee maker of 1925.
An early variation of this principle is called a balance siphon or Belgian brewer. This implementation has the two chambers arranged side by side on a balance-like device, with a counterweight attached to the heated chamber. Once the vapor has forced the hot water out, the counterweight activates a spring-loaded snuffer which smothers the flame and allows the initial chamber to cool down thus lowering pressure (creating a vacuum) and causing the brewed coffee to seep in.
In 2022, Tiger Corporation released an automated coffee-maker based on the vacuum coffee maker principle, which was marketed as the Siphonysta. The Siphonysta's heating is electrical. The chambers are made of plastic ("resin").
A vacuum coffee maker operates as a siphon, where heating and cooling the lower vessel changes the vapor pressure of water in the lower, first pushing the water up into the upper vessel, where the coffee is brewed, then allowing the brewed coffee to be strained as it is drawn back down into the lower vessel.
Specifically, by heating (A) the water in the sealed lower vessel (B), the combination of its vapor pressure (the pressure exerted by the vapor component of a liquid) and the pressure from heating the air will exceed the ambient standard atmospheric pressure, causing some of it to boil, turning into water vapor. Since the density of water vapor is approximately 1⁄2000 that of liquid water, the mixture of air and water vapor in the lower vessel quickly expands as more liquid is boiled to vapor, increasing the pressure in the lower vessel.
Once the pressure in the lower vessel exceeds atmospheric pressure, the remaining water is pushed up through the siphon tube (C) into the upper vessel (D), where it remains, so long as the pressure difference between the upper and lower vessels is sufficient to support it, about 1.5 kPa (0.015 atm). This pressure difference is maintained during brewing through the continuous heating of the lower vessel. Coffee grinds are added to the water in the upper chamber and coffee is brewed using the displaced water at slightly less than the boiling point, 100 °C (212 °F).
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Vacuum coffee maker AI simulator
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Vacuum coffee maker
A vacuum coffee maker brews coffee using two chambers where vapor pressure and gravity produce coffee. This type of coffee maker is also known as vac pot, siphon or syphon coffee maker, and was invented by Loeff of Berlin in the 1830s.
Since their invention, these devices have since been used in many parts of the world. While vacuum coffee makers generally were excessively complex for everyday use, they were prized for producing a clear brew, and were quite popular until the middle of the twentieth century. Vacuum coffee makers remain popular in some parts of Asia, including Japan and Taiwan.
Design and composition of the vacuum coffee maker varies. The chamber material is borosilicate glass, metal, or plastic, and the filter can be either a glass rod or a screen made of metal, cloth, paper, or nylon. The Napier Vacuum Machine by James Robert Napier, presented in 1840, was an early example of the vacuum brewing process. The Bauhaus interpretation of this device can be seen in Gerhard Marcks' Sintrax coffee maker of 1925.
An early variation of this principle is called a balance siphon or Belgian brewer. This implementation has the two chambers arranged side by side on a balance-like device, with a counterweight attached to the heated chamber. Once the vapor has forced the hot water out, the counterweight activates a spring-loaded snuffer which smothers the flame and allows the initial chamber to cool down thus lowering pressure (creating a vacuum) and causing the brewed coffee to seep in.
In 2022, Tiger Corporation released an automated coffee-maker based on the vacuum coffee maker principle, which was marketed as the Siphonysta. The Siphonysta's heating is electrical. The chambers are made of plastic ("resin").
A vacuum coffee maker operates as a siphon, where heating and cooling the lower vessel changes the vapor pressure of water in the lower, first pushing the water up into the upper vessel, where the coffee is brewed, then allowing the brewed coffee to be strained as it is drawn back down into the lower vessel.
Specifically, by heating (A) the water in the sealed lower vessel (B), the combination of its vapor pressure (the pressure exerted by the vapor component of a liquid) and the pressure from heating the air will exceed the ambient standard atmospheric pressure, causing some of it to boil, turning into water vapor. Since the density of water vapor is approximately 1⁄2000 that of liquid water, the mixture of air and water vapor in the lower vessel quickly expands as more liquid is boiled to vapor, increasing the pressure in the lower vessel.
Once the pressure in the lower vessel exceeds atmospheric pressure, the remaining water is pushed up through the siphon tube (C) into the upper vessel (D), where it remains, so long as the pressure difference between the upper and lower vessels is sufficient to support it, about 1.5 kPa (0.015 atm). This pressure difference is maintained during brewing through the continuous heating of the lower vessel. Coffee grinds are added to the water in the upper chamber and coffee is brewed using the displaced water at slightly less than the boiling point, 100 °C (212 °F).