EKC 394 Chemical Engineering Laboratory II: Coil Heat Exchanger Experiment

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What is the primary objective of determining the individual film coefficients hi and ho and overall heat transfer coefficient Uo?

To increase the efficiency of the heat exchanger

Why are coil heat exchangers constructed using circular layers of helically corrugated tubes?

To create a significant heat transfer surface within a light compact shell

What is the purpose of the swift uniform heating of fluids in coil heat exchangers?

To increase the total heat transfer coefficient

What feature is achieved by the haphazard movement of fluid particles in coil heat exchangers?

Reducing deposit buildup through 'scoop and lift' action

What is the effect of hot/cold water flow rate on the individual film coefficients and overall heat transfer coefficient in coil heat exchangers?

It increases the individual film coefficients and overall heat transfer coefficient

Why are the connection locations and angle of entry specially selected in coil heat exchangers?

To reduce the probability of debris buildup

What is the purpose of adjusting the hot water flow rate to the lowest value?

To maximize the heat gained by the cold water

What is the significance of reading the temperature TC1, TC2, TH1, and TH2 every 10 minutes?

To estimate the rates of heat gained by cold water and heat change in hot water

Why is it necessary to repeat the experiments for different cold water flow rates?

To estimate the rates of heat gained by cold water

What is the purpose of estimating Uo from the equation WcCpc(Tc2-Tc1)=UoAΔTlm?

To calculate the overall heat transfer coefficient Uo

What does using the Dittus-Boelter equation (Nu= hd/k= 0.023 Re^0.8 Pr^1/3 ϕv) help in determining?

The individual film coefficients hi

Why is it important to calculate shell side film coefficient ho?

To minimize the heat loss to the surroundings

What is the purpose of using equation (3) to calculate shell side film coefficient ho?

To estimate the rates of heat gained by cold water and heat change in hot water

Turbulent flow

Study Notes

Determining Film Coefficients and Heat Transfer Coefficient

• The primary objective of determining individual film coefficients hi and ho and overall heat transfer coefficient Uo is to understand the heat transfer process in coil heat exchangers.

Coil Heat Exchanger Design

• Coil heat exchangers are constructed using circular layers of helically corrugated tubes to enhance heat transfer and turbulence.

Fluid Heating in Coil Heat Exchangers

• The purpose of swift uniform heating of fluids in coil heat exchangers is to achieve efficient heat transfer.

Fluid Flow Characteristics

• The haphazard movement of fluid particles in coil heat exchangers achieves improved mixing and turbulence.

Effect of Flow Rate on Heat Transfer Coefficients

• The hot/cold water flow rate affects individual film coefficients and overall heat transfer coefficient Uo in coil heat exchangers.

Connection Location and Angle of Entry

• The connection locations and angle of entry are specially selected in coil heat exchangers to minimize pressure drops and enhance heat transfer.

• Adjusting the hot water flow rate to the lowest value helps to achieve optimal heat transfer conditions.

Temperature Measurement

• Reading the temperature TC1, TC2, TH1, and TH2 every 10 minutes allows for monitoring and analysis of the heat transfer process.

Experimentation and Data Analysis

• Repeating experiments for different cold water flow rates helps to understand the effects of flow rate on heat transfer coefficients.
• Estimating Uo from the equation WcCpc(Tc2-Tc1)=UoAΔTlm helps to determine the overall heat transfer coefficient.

Dittus-Boelter Equation

• Using the Dittus-Boelter equation (Nu= hd/k= 0.023 Re^0.8 Pr^1/3 ϕv) helps in determining the Nusselt number, which is related to heat transfer.

Shell Side Film Coefficient

• Calculating shell side film coefficient ho is important to understand the heat transfer process on the shell side.
• Using equation (3) to calculate shell side film coefficient ho helps to determine the heat transfer coefficient.

Tube Side Reynolds Number

• A higher tube side Re number indicates turbulent flow, which enhances heat transfer.

Test your knowledge of coil heat exchangers in this quiz based on the objectives and introduction to the laboratory experiment. Explore concepts related to determining film coefficients, overall heat transfer coefficient, and the effects of water flow rate and temperature.

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