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ε -NTU method is particularly useful in thermal design of heat exchangers when
- a)The outlet temperature of the fluid streams is not known as a priori
- b)Outlet temperature of the fluid streams is known as a priori
- c)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priori
- d)Inlet temperatures of the fluid streams are known as a priori
Correct answer is option 'A'. Can you explain this answer?
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Understanding the NTU Method
The NTU (Number of Transfer Units) method is a fundamental approach used in the thermal design of heat exchangers. It is particularly advantageous when certain conditions about fluid temperatures are unknown.
Why Option A is Correct
- Outlet Temperature Uncertainty:
- The NTU method excels when the outlet temperatures of the fluid streams are not known in advance. This scenario is common in real-world applications where the performance of heat exchangers needs to be estimated without precise temperature data.
- Performance Prediction:
- By utilizing the NTU method, engineers can predict the performance of a heat exchanger based on its design parameters (such as heat transfer coefficients, flow rates, and specific heat capacities) without requiring the outlet temperatures initially.
- Flexibility in Design:
- This method allows for the evaluation of various design configurations and operating conditions. It helps in determining how effective the heat exchanger will be under different scenarios, making it a crucial tool in thermal design.
Other Options Explained
- Option B:
- If the outlet temperatures are known, other simpler methods like the effectiveness-NTU relationship can be used, reducing the need for the NTU method.
- Option C:
- Knowing the outlet temperature of the hot fluid but not the cold fluid stream does not fully leverage the NTU method's strengths, as both outlet temperatures are important for effective calculations.
- Option D:
- While knowing the inlet temperatures helps, the NTU method is most beneficial when outlet temperatures are uncertain, thus making option A the optimal choice.
In summary, the NTU method is particularly useful when the outlet temperatures of fluid streams are unknown, allowing for effective thermal design and performance estimation of heat exchangers.
The NTU (Number of Transfer Units) method is a fundamental approach used in the thermal design of heat exchangers. It is particularly advantageous when certain conditions about fluid temperatures are unknown.
Why Option A is Correct
- Outlet Temperature Uncertainty:
- The NTU method excels when the outlet temperatures of the fluid streams are not known in advance. This scenario is common in real-world applications where the performance of heat exchangers needs to be estimated without precise temperature data.
- Performance Prediction:
- By utilizing the NTU method, engineers can predict the performance of a heat exchanger based on its design parameters (such as heat transfer coefficients, flow rates, and specific heat capacities) without requiring the outlet temperatures initially.
- Flexibility in Design:
- This method allows for the evaluation of various design configurations and operating conditions. It helps in determining how effective the heat exchanger will be under different scenarios, making it a crucial tool in thermal design.
Other Options Explained
- Option B:
- If the outlet temperatures are known, other simpler methods like the effectiveness-NTU relationship can be used, reducing the need for the NTU method.
- Option C:
- Knowing the outlet temperature of the hot fluid but not the cold fluid stream does not fully leverage the NTU method's strengths, as both outlet temperatures are important for effective calculations.
- Option D:
- While knowing the inlet temperatures helps, the NTU method is most beneficial when outlet temperatures are uncertain, thus making option A the optimal choice.
In summary, the NTU method is particularly useful when the outlet temperatures of fluid streams are unknown, allowing for effective thermal design and performance estimation of heat exchangers.
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ε -NTU method is particularly useful in thermal design of heat exchangers whena)The outlet temperature of the fluid streams is not known as a priorib)Outlet temperature of the fluid streams is known as a prioric)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priorid)Inlet temperatures of the fluid streams are known as a prioriCorrect answer is option 'A'. Can you explain this answer?
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ε -NTU method is particularly useful in thermal design of heat exchangers whena)The outlet temperature of the fluid streams is not known as a priorib)Outlet temperature of the fluid streams is known as a prioric)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priorid)Inlet temperatures of the fluid streams are known as a prioriCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about ε -NTU method is particularly useful in thermal design of heat exchangers whena)The outlet temperature of the fluid streams is not known as a priorib)Outlet temperature of the fluid streams is known as a prioric)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priorid)Inlet temperatures of the fluid streams are known as a prioriCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for ε -NTU method is particularly useful in thermal design of heat exchangers whena)The outlet temperature of the fluid streams is not known as a priorib)Outlet temperature of the fluid streams is known as a prioric)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priorid)Inlet temperatures of the fluid streams are known as a prioriCorrect answer is option 'A'. Can you explain this answer?.
ε -NTU method is particularly useful in thermal design of heat exchangers whena)The outlet temperature of the fluid streams is not known as a priorib)Outlet temperature of the fluid streams is known as a prioric)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priorid)Inlet temperatures of the fluid streams are known as a prioriCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about ε -NTU method is particularly useful in thermal design of heat exchangers whena)The outlet temperature of the fluid streams is not known as a priorib)Outlet temperature of the fluid streams is known as a prioric)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priorid)Inlet temperatures of the fluid streams are known as a prioriCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for ε -NTU method is particularly useful in thermal design of heat exchangers whena)The outlet temperature of the fluid streams is not known as a priorib)Outlet temperature of the fluid streams is known as a prioric)The outlet temperature of the hot fluid streams is known but that of the coldfluid streams is not known as a priorid)Inlet temperatures of the fluid streams are known as a prioriCorrect answer is option 'A'. Can you explain this answer?.
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