You have been asked to design a heat exchanger to pasturize milk by raising it from 4°C to 72°C. The milk will be run through the heat exchanger at a flow rate of 15 liters/second. To create the heat exchanger, milk will flow through tubes with a 1.2 cm diameter. The tubes will be kept at a constant surface temperature through exposure to condensing steam at 100°C. You have been asked to calculate the following: • A single tube design – You must specify: ∗ The length of the tube ∗ Average milk velocity ∗ The pressure drop required to operate the exchanger ∗ Give at least two reasons why a single tube heat exchanger is not feasible
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
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You have been asked to design a heat exchanger to pasturize milk by raising it from 4°C to 72°C. The milk will be run through the heat exchanger at a flow rate of 15 liters/second. To create the heat exchanger, milk will flow through tubes with a 1.2 cm diameter. The tubes will be kept at a constant surface temperature through exposure to condensing steam at 100°C.
You have been asked to calculate the following:
• A single tube design
– You must specify:
∗ The length of the tube
∗ Average milk velocity
∗ The pressure drop required to operate the exchanger
∗ Give at least two reasons why a single tube heat exchanger is not feasible
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