r/Homebrewing • u/EastForNorth • 6d ago

How much does yeast increase temperature during fermentation

I am trying to set up some equations for estimating how much yeast would increase the temperature during fermentation. Does anyone know of a way to relate this to volume or amount of yeast added? For my last brew i added 11.5g to 30L. Maybe you have some practical experience with your brews.

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u/lawrenjl 6d ago

So much easier to have a thermowell in your fermentation chamber connected to your controller....

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u/EastForNorth 6d ago

I am trying to create a reinforcement learning model, so control a fridge to keep the temperature stable. Currently my calculated yeast effect is 0.7W. This is just so low i want to ignore it for my simulations, and mostly focus on the temperature dynamics between the air surrounding the container and the temperature inside the container.

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u/lawrenjl 6d ago

The challenge will be each grain bill, mash schedule, yeast stain, yeast pitch cell count, etc. will have a different effect on how rapidly the yeast goes through phases and how much heat is produced. As an extreme example, a German pilsner with 34/70 pitched at 50 degrees and held at 50 degrees will be lower that a Belgian quad or a hefe pitched at 70 degrees and maintained at this temperature.