In an industrial bottling plant, the glass bottles must be washed, dried, and co

Q: In an industrial bottling plant, the glass bottles must be washed, dried, and co

Solution. Heat load is the quantity of heat per unit time that must be supplied to maintain the process. Let's consider the production during 1 hr. 1000 bottles will weigh 1000*0.5 = 500 kg of glass, or 500*0.18*(100-25) = 6750 kcal of heat; 1000 bottles will retain 0.1*500 = 50 kg of water, or 50*1*(100-25) = 3750 kcal of heat Total: 6750+3750 =10500 kcal/hr.

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Question

In an industrial bottling plant, the glass bottles must be washed, dried, and cooled before going to the filling department. The plant operates at atmospheric pressure at a capacity of 1000 bottles/hr. During washing process the bottles retain 0.1kg H2O/kg glass and enters the drier at 25C. Determine the heat load on the dryer if the dry bottles leave at 100C. Each bottle weighs 0.5 kg. Assume the heat capacity over the temperature of operation is 0.18 kcal/kg.K for glass and 1.00 kcal/kg.K for water.

Explanation / Answer

Solution.

Heat load is the quantity of heat per unit time that must be supplied to maintain the process.

Let's consider the production during 1 hr.

1000 bottles will weigh 1000*0.5 = 500 kg of glass, or 500*0.18*(100-25) = 6750 kcal of heat;

1000 bottles will retain 0.1*500 = 50 kg of water, or 50*1*(100-25) = 3750 kcal of heat

Total: 6750+3750 =10500 kcal/hr.

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In an industrial bottling plant, the glass bottles must be washed, dried, and co

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