Solved: In a dairy plant, milk at 48C is pasteurized
Chapter 8, Problem 8126(choose chapter or problem)
In a dairy plant, milk at 48C is pasteurized continuously at 728C at a rate of 12 L/s for 24 h/day and 365 days/yr. The milk is heated to the pasteurizing temperature by hot water heated in a natural gas-fired boiler having an efficiency of 82 percent. The pasteurized milk is then cooled by cold water at 188C before it is finally refrigerated back to 48C. To save energy and money, the plant installs a regenerator that has an effectiveness of 82 percent. If the cost of natural gas is $1.30/therm (1 therm 5 105,500 kJ), determine how much energy and money the regenerator will save this company per year and the annual reduction in exergy destruction.
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