fermentation temperature

FACTS
fermentation is an exothermic, biochemical reaction
every kg of extract fermented produces 140kcal of heat

CAUSES OF LOW TEMPERATURES
over-zealous wort-cooling
cold ambient temperatures

EFFECTS OF LOW TEMPERATURES
increases fermentation time
encourages yeast to flocculate
ale yeasts produce more sulfur compounds

CAUSES OF HIGH TEMPERATURES
inefficient or malfunctioning glycol system

EFFECTS OF HIGH TEMPERATURES
decreases fermentation time
decreases acetaldehyde
increases fermentation by-products
increases ethyl acetate
increases fusel alcohols