2nd midterm Flashcards
cold bottles entering tunnel pasteurizier is used to cool the
water that is used to cool the bottles at the discharge end
flash pasteurizer is heated to
70 C for a very short amount of time
cooling section of a flash pasteurizer
has no impact on the heat up section of the in-coming beer
cooling section of a flash pasteurizer
has no impact on the heat up section of the in-coming beer
hollow fibre hydrophobic membranes both
add and removes gasses from beer
total pressure equals the sum of partial pressure of individual components.
Daltons Law
At a constant temperature(for a given mass of gas) volume is inversely proportional to pressure.
Boyle’s Law
Nitrogen is 120x
less soluable than CO2
solution for long draft lines are
Installation of beer pump
Mixed gas of nitrogen and CO2
balanced draft system is when
resistance to the flow from keg to tap is appox equal
Properly adjusted system should pour at
1 gal/ min
In a flash pasteurizer as much as ____% of the heat content is recovered
94-95%
The last heating zone in a tunnel pasteurizer before the holding section is
Superheat Zone
Henry’s Law P=H*X
p=pressure of gas
h=henry;’s constant for a given gas
x=molar fraction of gas
Henry’s law defines in which a gas distributes itself between the gas phase and the solution phase
true
At a constant pressure (for a gven mass of a gas) the volume of gas is directly proportional to the temperature.
Gay-Lussac’s Law
Nitrogen is significantly
less dense than CO2
The purpose of a choker line is
to equal the gas pressure and distance to make pouring a beer easy/ without foam
properly adjusted draft system should take ____sec to fill a 1.89L growler
30 seconds
Peak production temperature achieved in a tunnel pasteurizer is
around 60 C
failure pressure for tunnel pasteurizer with small packages
non return bottle=10 bar
Cans= 6 bars
Returnable bottle=12 bar
P x V = n x R x T
Combined gas law
Decimal reduction time(D) is the time needed at a given temperature to
inactivate 90 % of the viable microbrail population
why things can’t grow in beer
anaerobic environment