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Heat Transfer Enhancement: Performance Evaluation Criteria (PEC) for Single-Phase Flow

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Heat Transfer Enhancement: Performance Evaluation Criteria (PEC) for Single-Phase Flow

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Questions and Answers

What is the primary reason for increasing the flow area in a heat exchanger?

To decrease the number of parallel flow circuits

To increase the thermal effectiveness of the heat exchanger

To increase the pumping power required

To reduce the tube-side velocity and accommodate higher friction characteristics (correct)

What is the benefit of maintaining a constant exchanger flow rate in the PEC analysis?

It avoids the penalty of operating at higher thermal effectiveness (correct)

It increases the pumping power required

It reduces the thermal effectiveness of the heat exchanger

It decreases the heat transfer coefficient

What is the purpose of developing algebraic relations in the PEC analysis?

To calculate the performance improvement for the PEC cases (correct)

To compare the performance of different heat exchangers

To quantify the heat transfer coefficient

To determine the optimal heat exchanger design

What is the advantage of referencing the algebraic relations to a smooth surface operating at the same fluid temperature?

It allows for the cancellation of the fluid properties from the equations Signup and view all the answers

What is the total tube-side surface area in the heat exchanger?

A = πdiLNNP Signup and view all the answers

What is the primary purpose of using a greater number of parallel flow circuits in the PEC analysis?

To maintain a constant flow rate while reducing the tube-side velocity Signup and view all the answers

What is the benefit of using enhanced tubes in the PEC analysis?

It increases the heat transfer coefficient Signup and view all the answers

What is the purpose of the PEC analysis in the context of heat exchanger design?

To evaluate the performance of different heat exchanger designs Signup and view all the answers

What is the relationship between the number of tubes in the flow passage and the total tube-side surface area?

The total tube-side surface area increases as the number of tubes increases Signup and view all the answers

What is the primary consideration in the design of a condenser using the PEC analysis?

All of the above Signup and view all the answers