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Consider the following statements The flow configuration in a heat exchanger whether counter flow or otherwise, will not matter if 1. a liquid is evaporating 2. a vapour is condensing 3. mass flow rate of one of the fluids is far greater Which of these statements correct?
- a)1 and 2
- b)1 and 3
- c)2 and 3
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements The flow configuration in a heat ex...
The configuration of the heat exchanger does not matter if one of the fluids is changing phase or capacity rate of one fluid is far greater than capacity rate of the other fluid.
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Consider the following statements The flow configuration in a heat ex...
Explanation:
The flow configuration in a heat exchanger refers to the direction of flow of the two fluids involved. The two common flow configurations are counter flow and parallel flow. In counter flow, the hot fluid enters at one end of the exchanger and flows towards the other end, while the cold fluid enters at the other end and flows towards the first end. In parallel flow, both fluids enter at the same end and flow in the same direction.
Statement 1: A liquid is evaporating
When a liquid is evaporating, it changes phase from a liquid to a vapor. This process requires heat input from the surroundings. In a heat exchanger, the hot fluid (usually a vapor or gas) transfers heat to the cold fluid (usually a liquid) causing it to evaporate. The flow configuration in this case does matter because the efficiency of heat transfer is affected by the flow direction. In counter flow, the temperature difference between the two fluids is maintained throughout the exchanger, resulting in a higher overall heat transfer coefficient. This leads to better heat transfer and more efficient evaporation.
Statement 2: A vapor is condensing
When a vapor is condensing, it changes phase from a vapor to a liquid. This process releases heat to the surroundings. In a heat exchanger, the hot fluid transfers heat to the cold fluid causing the vapor to condense. Similar to statement 1, the flow configuration does matter because the efficiency of heat transfer is affected by the flow direction. In counter flow, the temperature difference between the two fluids is maintained throughout the exchanger, resulting in a higher overall heat transfer coefficient. This leads to better heat transfer and more efficient condensation.
Statement 3: Mass flow rate of one of the fluids is far greater
The mass flow rate of a fluid is a measure of the amount of fluid flowing per unit time. When the mass flow rate of one of the fluids is far greater than the other, it can significantly affect the heat transfer performance of the heat exchanger. In this case, the flow configuration becomes more important. In counter flow, the temperature difference between the two fluids is maintained throughout the exchanger, which helps in reducing the logarithmic mean temperature difference (LMTD) and improving the overall heat transfer. This results in a more efficient heat transfer process.
Therefore, all three statements are correct. The flow configuration in a heat exchanger does matter when a liquid is evaporating, a vapor is condensing, or the mass flow rate of one of the fluids is far greater. The choice of flow configuration can significantly impact the efficiency of heat transfer in these scenarios.
The flow configuration in a heat exchanger refers to the direction of flow of the two fluids involved. The two common flow configurations are counter flow and parallel flow. In counter flow, the hot fluid enters at one end of the exchanger and flows towards the other end, while the cold fluid enters at the other end and flows towards the first end. In parallel flow, both fluids enter at the same end and flow in the same direction.
Statement 1: A liquid is evaporating
When a liquid is evaporating, it changes phase from a liquid to a vapor. This process requires heat input from the surroundings. In a heat exchanger, the hot fluid (usually a vapor or gas) transfers heat to the cold fluid (usually a liquid) causing it to evaporate. The flow configuration in this case does matter because the efficiency of heat transfer is affected by the flow direction. In counter flow, the temperature difference between the two fluids is maintained throughout the exchanger, resulting in a higher overall heat transfer coefficient. This leads to better heat transfer and more efficient evaporation.
Statement 2: A vapor is condensing
When a vapor is condensing, it changes phase from a vapor to a liquid. This process releases heat to the surroundings. In a heat exchanger, the hot fluid transfers heat to the cold fluid causing the vapor to condense. Similar to statement 1, the flow configuration does matter because the efficiency of heat transfer is affected by the flow direction. In counter flow, the temperature difference between the two fluids is maintained throughout the exchanger, resulting in a higher overall heat transfer coefficient. This leads to better heat transfer and more efficient condensation.
Statement 3: Mass flow rate of one of the fluids is far greater
The mass flow rate of a fluid is a measure of the amount of fluid flowing per unit time. When the mass flow rate of one of the fluids is far greater than the other, it can significantly affect the heat transfer performance of the heat exchanger. In this case, the flow configuration becomes more important. In counter flow, the temperature difference between the two fluids is maintained throughout the exchanger, which helps in reducing the logarithmic mean temperature difference (LMTD) and improving the overall heat transfer. This results in a more efficient heat transfer process.
Therefore, all three statements are correct. The flow configuration in a heat exchanger does matter when a liquid is evaporating, a vapor is condensing, or the mass flow rate of one of the fluids is far greater. The choice of flow configuration can significantly impact the efficiency of heat transfer in these scenarios.
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Consider the following statements The flow configuration in a heat exchanger whether counter flow or otherwise, will not matter if 1. a liquid is evaporating 2. a vapour is condensing 3. mass flow rate of one of the fluids is far greater Which of these statements correct?a) 1 and 2b) 1 and 3c) 2 and 3d) 1, 2 and 3Correct answer is option 'D'. Can you explain this answer?
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