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How to find a decent cup of coffee in virtually any city

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How to find a decent cup of coffee in virtually any city

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Vladimir Bogdan
Tuesday, 07 November 2017
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Roasting coffee transforms the chemical and physical properties of green coffee beans into roasted coffee products. The roasting process is what produces the characteristic flavor of coffee by causing the green coffee beans to change in taste.

The majority of coffee is roasted on a large scale, but small-scale roasting has grown with the trend toward specialty shops.

Process

The vast majority of coffee is roasted commercially on a large scale, but small-scale commercial roasting has grown significantly with the trend toward “single-origin” coffees served at specialty shops. Some coffee drinkers even roast coffee at home as a hobby in order to both experiment with the flavor profile of the beans and ensure themselves of the freshest possible roast.

The coffee-roasting process follows coffee processing and precedes coffee brewing. It consists essentially of sorting, roasting, cooling, and packaging but can also include grinding in larger-scale roasting houses. In larger operations, bags of green coffee beans are hand- or machine-opened, dumped into a hopper, and screened to remove debris. The green beans are then weighed and transferred by belt or pneumatic conveyor to storage hoppers. From the storage hoppers, the green beans are conveyed to the roaster. Initially, the process is endothermic (absorbing heat), but at around 175 °C (347 °F) it becomes exothermic (giving off heat). For the roaster, this means that the beans are heating themselves and an adjustment of the roaster’s heat source might be required. At the end of the roasting cycle, the roasted beans are dumped from the roasting chamber and air cooled with a draft inducer.

Equipment

The most common roasting machines are of two basic types: drum and hot-air, although there are others including packed-bed, tangential and centrifugal roasters. Roasters can operate in either batch or continuous modes. Home roasters are also available.

Drum machines consist of horizontal rotating drums that tumble the green coffee beans in a heated environment. The heat source can be supplied by natural gas, liquefied petroleum gas (LPG), electricity, or even wood. The most common employ indirectly heated drums where the heat source is under the drum. Direct-fired roasters are roasters in which a flame contacts the beans inside the drum; very few of these machines are still in operation.

The most common roasting machines are of two basic types: drum and hot-air, although there are others including packed-bed, tangential and centrifugal roasters.

Hot-air roasters force heated air through a screen or perforated plate under the coffee beans with sufficient force to lift the beans. Heat is transferred to the beans as they tumble and circulate within this fluidized bed. Some coffee roasters use names for the various degrees of roast, such as City Roast and French Roast, for the internal bean temperatures found during roasting.

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Vladimir Bogdan

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Comments 3

Vladimir Bogdan
Vladimir Bogdan on Thursday, 21 December 2017 11:10

Someone who truly loves you, sees what a mess you can be, how moody you can get, and how hard you can be to handle, but still wants you.

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Someone who truly loves you, sees what a mess you can be, how moody you can get, and how hard you can be to handle, but still wants you.
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Vladimir Bogdan
Vladimir Bogdan on Thursday, 21 December 2017 11:11

Never make any decision when you're happy or when you are sad. You might regret it later on.

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Never make any decision when you're happy or when you are sad. You might regret it later on.
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Vladimir Bogdan
Vladimir Bogdan on Thursday, 21 December 2017 11:11

Emotionally- I'm done. Mentally- I'm drained. Spiritually- I'm dead. Physically- I smile.

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Emotionally- I'm done. Mentally- I'm drained. Spiritually- I'm dead. Physically- I smile.
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Vladimir Bogdan How to find a decent cup of coffee in virtually any city
21 December 2017
Never make any decision when you're happy or when you are sad. You might regret it later on.
Vladimir Bogdan How to find a decent cup of coffee in virtually any city
21 December 2017
Emotionally- I'm done. Mentally- I'm drained. Spiritually- I'm dead. Physically- I smile.
Vladimir Bogdan How to find a decent cup of coffee in virtually any city
21 December 2017
Someone who truly loves you, sees what a mess you can be, how moody you can get, and how hard you ca...

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