Roast and Learn Together - Terms and Definitions - Page 2

Discuss roast levels and profiles for espresso, equipment for roasting coffee.
pShoe

#11: Post by pShoe »

Here is a blast from the past...
farmroast wrote: ACRONYMS:

BT--Bean Temperature: as measured by thermocouple or thermometer in the bean mass.

ET--Environmental Temperature: The environmental/air temperature in or around the roast chamber that relates to the average temperature the beans are being exposed to at a particular point in the roast.

MET--Maximum Environmental Temperature: The maximum environmental temperature the beans are exposed to in the roast environment. Can also refer to the maximum ET the beans are exposed to during the roast.

RoR-- Rate of Rise of BT degrees(C or F) rise/time(usually per minute)

RoC-- Rate of Change of ET, positive or negative.

TC--Thermocouple: A digital thermometer with a wire and probe or wire that is bare at the end with a bead tip or wrapped.

TC4-- A Arduino based roast monitoring and controlling device developed by the homeroasting community TC4

WP-- Wet processed coffee

DP-- Dry processed coffee

TERMS:

Drop temperature: The ET at the time the beans enter the roaster.

Turnaround Temperature: The BT reading at the point after the beans are dropped when the BT reading begins to increase/turnaround after dropping from the preheat temp.

Dump: The point when the roast ends.

Warming Phase: The initial phase of heat being applied to the beans.

Drying Phase/Stage: The first part of the roast where the beans are dried to the proper level.

Ramp Phase/Stage : The phase/stage after the drying up to 1st crack where the heat applied is generally increased. Maillard reactions are occurring and then sugars.

First Crack: A popping sound similar to popcorn where moisture is released

Second Crack: A snapping sound similar to rice krispies where co2 is released

Conduction: Heat applied by direct contact

Convection: Heat applied by air

Radiant: Heat applied by radiance off of a surface, heating element, infra red heat

Exothermic: Where the beans are releasing heat energy

Endothermic: Where the beans are absorbing heat energy

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Boldjava (original poster)
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#12: Post by Boldjava (original poster) »

Thanks Paul.

Farm, with your OK, I am going to integrate your work into the first post. Have one master set of def's.

B|Java
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pShoe

#13: Post by pShoe »

I should have reached out to Ed before I posted... My mistake. I'm going through older topics here, and came across this one. Thought, well this is a nice find considering this recent post.

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TomC
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#14: Post by TomC »

Just a general observation/question. It will likely not sit well with everyone, so I doubt it would be universally adopted, but I imagine it would be a lot easier going thru profiles and posts reading cupping notes, etc, if we used one temp or another, instead of half of us using Fahrenheit and the other half using Celsius. Problem is, there's good arguments for using both.
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another_jim
Team HB

#15: Post by another_jim »

Complete confusion is best -- my ET dial is in F, and BT dial in C.
Jim Schulman

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TomC
Team HB

#16: Post by TomC »

:lol: You're so analogue
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farmroast

#17: Post by farmroast »

Boldjava wrote:Thanks Paul.

Farm, with your OK, I am going to integrate your work into the first post. Have one master set of def's.

B|Java
sorry, just reading this thread. If we want to update/add to my list in the Roasting,FAQs and Favorites section then just work them out here and I'll edit them in.
still kinda on the fence with jim's CCIB acronym :roll:
farm
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boar_d_laze

#18: Post by boar_d_laze »

A few things:

1. Before adopting Farm's lexicon:
  • "Charge" is the usual term for beans in, not "Drop;"
  • "Drop" is the usual term for beans out, not "Dump;" and
  • "Charge" and "Drop" are respectively the terms used in Artisan for in and out.
We should stick with the standard terminology.

2. Centigrade to Farenheit, and vice versa:
  • C = 5/9 x (F - 32);
  • F = (9/5 x C) + 32; and for the absolutists among us
  • K = C + 273.
BDL
Drop a nickel in the pot Joe. Takin' it slow. Waiter, waiter, percolator

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SAS
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#19: Post by SAS »

Yesterday I got tired of converting each Farenheit to Centigrade, so I made a spreadsheet and printed it as a PDF file. It covers the ranges of BTs and METs, start to finish, and a bit more.

If you want to have a copy for yourself, just save it to your device of choice. Enjoy.

Temperature Chart: F to C
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Running on fumes.

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Boldjava (original poster)
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#20: Post by Boldjava (original poster) »

SAS wrote:Yesterday I got tired of converting each Farenheit to Centigrade...

https://dl.dropboxusercontent.com/u/242 ... 0CHART.pdf
Nice job. It would be great if the US got with the program and joined the rest of the world with Centigrade.
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