The AB brewery in Fairfield, CA produces 1.3 million gallons of beer per year. The plant operates 96% of the time. Gas costs 1.25 per therm and electricity costs $0.09/kW-hr. As brewery engineer, you must consider the following pasteurization options:Option 1aAZ

Lager

Heat (Natural Gas)

Heat (Refrigeration)

4oC 72oC 4oC

Lager

Heat (Electricity)

Heat (Refrigeration)

4oC 72oC 4oC

Lager

Heat (Natural Gas)

Heat (Refrigeration)

4oC 65oC

T4

72oC

4oC

What is the yearly heating cost for all three options?

What fraction of the heating and cooling is achieved in the regenerator?

Which option should you choose?