EKC 394 Chemical Engineering Lab II: Double Pipe Heat Exchanger

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What is the primary purpose of a double pipe heat exchanger?

To mix two fluids of different temperatures

To cool a hotter fluid with a colder fluid

To increase the surface area of the fluids

To heat a colder fluid with a hotter fluid (correct)

When is a shell and tube heat exchanger preferred over a double pipe heat exchanger?

For small load applications

For heating fluids with very high temperature differences

When the surface area needed is low

For applications requiring large surface areas (correct)

In a double pipe heat exchanger, how can hot water and cold water enter?

Either by co-current or countercurrent directions (correct)

Only in counter-clockwise direction

In a turbulent manner

Simultaneously

What is the equation used to calculate heat transfer, Q, in any operating condition?

$Q = (T_A - T_B)\ln(r_o/r_i) + (1/h_iA_i + 1/(2\pi kL) + 1/h_oA_o)$ (D) Signup and view all the answers

What does 'U' represent in the equation for heat transfer Q?

Total heat transfer coefficient (C) Signup and view all the answers

When would the shell and tube heat exchanger be chosen over the double pipe heat exchanger?

For high-temperature applications (A) Signup and view all the answers

What is the formula for log mean temperature difference (LMTD) in a heat exchanger?

$\Delta T_{log} = \frac{\text{ln}(T_h2 - T_c2)}{T_h1 - T_c1}$ (A) Signup and view all the answers

What is the formula for heat transfer, Q, in a heat exchanger?

$Q = \frac{T_h2 - T_c2}{T_h1 - T_c1} + \frac{T_h1 + T_c1}{T_h2 + T_c2}$ (C) Signup and view all the answers

Which equation represents the log mean temperature difference (LMTD) as a function of the temperature of the hot and cold fluids?

$\Delta T_{log} = \frac{\text{ln}(T_h2 - T_c2)}{T_h1 - T_c1}$ (A) Signup and view all the answers

What is the purpose of switching on the pump for hot water without turning on the heater in the experiment procedure?

To circulate hot water through the heat exchanger (D) Signup and view all the answers

What does 'steady state' refer to in the context of recording temperature data during the experiment?

When the temperature remains constant over time (A) Signup and view all the answers

In which direction is the cold water flow initially set during the experiment procedure?

Co-current direction (D) Signup and view all the answers

What does 𝑇𝑐 represent in the context of recording temperature data in the experiment procedure?

Temperature of cold fluid at outlet (A) Signup and view all the answers

What is the main factor for calculating log mean temperature difference (LMTD)?

Temperature of hot fluid at inlet and outlet (A) Signup and view all the answers

Why is it important to set the flow rate of hot water supply to a steady rate before switching on the heater?

To avoid fluctuations in hot water flow rate (A) Signup and view all the answers

What does $𝐿$ represent in the formula for log mean temperature difference ($Δ𝑇_{log}$)?

Length of tube (A) Signup and view all the answers

What does $rac{T_{h1}+ T_{c1}}{T_{h2} + T_{c2}}$ represent in the formula for heat transfer ($Q$)?

Overall average temperature ratio between hot and cold fluids (A) Signup and view all the answers

EKC 394 Chemical Engineering Lab II: Double Pipe Heat Exchanger

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