What does Exothermic mean?
In coffee roasting, the exothermic process refers to the stage of roasting where heat energy is released. This happens during first crack, which is the point where the coffee beans begin to crack and expand, and steam is released. The exothermic process occurs because the chemical reactions that take place during first crack release heat energy.
Understanding the exothermic process is important for coffee roasters because it affects the development of flavor and aroma in the coffee. The release of heat energy during first crack can cause the coffee beans to develop a sweeter, more complex flavour profile. However, if the roaster applies too much heat during this stage, it can lead to a burnt or bitter taste in the coffee.
Roasters must carefully monitor the exothermic process during the roasting process to achieve the desired flavour profile. This requires precise control over the heat source and monitoring the temperature of the beans throughout the roast. Roasters may adjust the heat level and duration of the roast to influence the exothermic process and achieve the desired flavour profile.
In summary, exothermic refers to the release of heat energy during chemical reactions in the coffee roasting process, particularly during first crack. Roasters must carefully manage this process to achieve the desired flavour and aroma in the coffee.