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Number of Transfer Unit NTU Heat Exchanger HMT Tutorial- 27, Heat and Mass Transfer, GATE Video Lecture | Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering

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FAQs on Number of Transfer Unit NTU Heat Exchanger HMT Tutorial- 27, Heat and Mass Transfer, GATE Video Lecture - Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering

1. What is the formula for calculating the number of transfer units (NTU) in a heat exchanger?
Ans. The formula for calculating the number of transfer units (NTU) in a heat exchanger is NTU = (UA)/(C_min), where NTU is the number of transfer units, U is the overall heat transfer coefficient, A is the heat transfer surface area, and C_min is the minimum heat capacity rate of the two fluids.
2. How is the effectiveness of a heat exchanger related to the number of transfer units (NTU)?
Ans. The effectiveness of a heat exchanger is directly related to the number of transfer units (NTU). The effectiveness (ε) is given by the formula ε = (1 - e^(-NTU))/(1 - e^(-NTU*C_min/C_max)), where C_max is the maximum heat capacity rate of the two fluids. A higher NTU value indicates a more efficient heat exchanger with a higher heat transfer effectiveness.
3. What is the significance of the number of transfer units (NTU) in heat exchanger design?
Ans. The number of transfer units (NTU) is significant in heat exchanger design as it helps determine the efficiency and size of the heat exchanger. A higher NTU value indicates a more efficient heat exchanger, meaning that it can transfer more heat between the two fluids. The NTU value also influences the required surface area and overall dimensions of the heat exchanger.
4. How does the number of transfer units (NTU) affect the heat transfer rate in a heat exchanger?
Ans. The number of transfer units (NTU) directly affects the heat transfer rate in a heat exchanger. A higher NTU value indicates a higher heat transfer rate, as more heat is being transferred between the two fluids. Conversely, a lower NTU value indicates a lower heat transfer rate. Therefore, the NTU value is crucial in determining the effectiveness and performance of a heat exchanger.
5. Can the number of transfer units (NTU) be greater than 1?
Ans. Yes, the number of transfer units (NTU) can be greater than 1. In fact, a NTU value greater than 1 indicates a more efficient heat exchanger with higher heat transfer effectiveness. The NTU value can range from 0 to infinity, and a value greater than 1 signifies a significant heat transfer potential between the two fluids in the heat exchanger.
59 videos|204 docs
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