Since the water for brewing coffee is heated in a large boiler, the water will be stale after being left in the boiler for too long, and the temperature difference of the hot water will increase due to the use of steam. The temperature difference of the hot water for making coffee.
In order to improve the temperature difference, Ernesto Valente established the world’s first FAEMA with a pump as a pressure source in 1960.
In E61, the heating method of the water used to brew coffee has been changed, so that the water used for brewing coffee does not directly contact the heat source, but uses a method similar to water-insulating heating.
FAEMA
The E61 boiler (hereinafter referred to as the outer boiler) is in the middle of a pipe (hereinafter referred to as the internal pipeline), which uses a pump to introduce fresh cold water into the internal curved pipeline. When the pump pushes fresh cold water through this pipe, the cold water will become hot due to the hot water in the outer boiler, but the pipe is wrapped around it, so the fresh water will not come into contact with the hot water of the outer boiler. The reason for the curved shape of the water pipe is to make the cold water have enough time to contact the outer boiler and become the hot water temperature just suitable for brewing coffee.
Due to the hot water circulation in the boiler, the brewing temperature of each cup of coffee is very close, whether it is brewing one cup an hour or one hundred cups at once. In this way, not only can the temperature difference be reduced, but also the freshness of the water can be taken into account. The hot water in the outer boiler is only used to produce milk foam steam, and will not be used to brew coffee.
This is the principle of a single boiler heat exchanger. Until the end of 2018, the internal structure and principle of most Italian coffee machines are still very close to FAEMA E61.
From the above description, we can infer that the larger the capacity of the external boiler, the lower the temperature difference of hot water for brewing coffee, the more it can reduce the influence of the temperature difference caused by the use of steam.
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