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Questions and Answers
In a double pipe heat exchanger, what primarily facilitates the heat transfer between two fluids?
In a double pipe heat exchanger, what primarily facilitates the heat transfer between two fluids?
- Radiation from one fluid to the other.
- A conductive partition separating the fluids. (correct)
- Direct mixing of the fluids.
- Evaporation of one fluid into the other.
Which heat exchanger type is most likely used when it is necessary to achieve the highest possible heat transfer efficiency?
Which heat exchanger type is most likely used when it is necessary to achieve the highest possible heat transfer efficiency?
- Cross flow.
- Parallel flow.
- Direct contact.
- Counter flow. (correct)
What characterizes a parallel flow heat exchanger's temperature profile along its length?
What characterizes a parallel flow heat exchanger's temperature profile along its length?
- A temperature difference that increases from inlet to outlet.
- A decreasing temperature difference as fluids approach thermal equilibrium. (correct)
- A consistently large temperature difference between the fluids.
- No temperature change along its length.
How do cooling towers, as direct contact heat exchangers, reduce water temperature?
How do cooling towers, as direct contact heat exchangers, reduce water temperature?
Considering surface compactness, how do shell and tube heat exchangers differ from cooling towers?
Considering surface compactness, how do shell and tube heat exchangers differ from cooling towers?
Which statement accurately compares heat transfer efficiency between parallel and counter flow heat exchangers?
Which statement accurately compares heat transfer efficiency between parallel and counter flow heat exchangers?
In a cross flow heat exchanger, how are the hot and cold fluids oriented relative to each other?
In a cross flow heat exchanger, how are the hot and cold fluids oriented relative to each other?
A chemical processing plant needs to cool a corrosive gas but prevent it from directly contacting the coolant. Which type of heat exchanger is most suitable?
A chemical processing plant needs to cool a corrosive gas but prevent it from directly contacting the coolant. Which type of heat exchanger is most suitable?
What limitation do parallel flow heat exchangers face due to their flow configuration?
What limitation do parallel flow heat exchangers face due to their flow configuration?
Which of the following is NOT an example of a heat exchanger?
Which of the following is NOT an example of a heat exchanger?
Flashcards
Heat Exchanger
Heat Exchanger
A device that facilitates heat exchange between two fluids at different temperatures, essential for temperature regulation in various industrial applications.
Cooler (Heat Exchanger)
Cooler (Heat Exchanger)
A type of heat exchanger where air is cooled by the evaporation of water, which absorbs heat from the air.
Cooling Tower
Cooling Tower
A type of heat exchanger that cools water using air; water temperature decreases through direct air contact.
Direct Contact Heat Exchanger
Direct Contact Heat Exchanger
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Indirect Contact Heat Exchanger
Indirect Contact Heat Exchanger
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Parallel Flow Heat Exchanger
Parallel Flow Heat Exchanger
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Counter Current Flow Heat Exchanger
Counter Current Flow Heat Exchanger
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Cross Flow Heat Exchangers
Cross Flow Heat Exchangers
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Study Notes
Heat Exchangers: An Introduction
- A heat exchanger is a device facilitating heat exchange between fluids at different temperatures.
- These are essential for temperature regulation across various industrial applications.
- A heat exchanger commonly transfers heat from a hot fluid to a cold fluid.
- Heat transfer occurs through conduction, convection, and/or radiation.
- A cooler exemplifies a heat exchanger by cooling air through water evaporation.
- The water absorbs heat from the air during evaporation, thus cooling it.
- Cooling towers also function as heat exchangers.
- These cool water using air, unlike coolers.
- Water temperature decreases via contact with air.
- Other types of heat exchangers include chillers, condensers, evaporators, and heaters.
Classification of Heat Exchangers
- Heat exchangers are classified based on construction, surface compactness, and flow arrangement.
Classification Based on Construction
- Types include double pipe, shell and tube, plate type, and graphite block heat exchangers.
Classification Based on Surface Compactness
- Direct Contact Type:
- Features fluids directly contacting each other.
- Examples include cooling towers and coolers.
- Indirect Contact Type:
- Separates fluids with a partition, typically a conductor.
- Plate type and shell and tube heat exchangers are examples.
Classification Based on Flow Arrangement
- Parallel Flow:
- Fluids flow in the same direction.
- Counter Flow:
- Fluids flow in opposite directions.
- Cross Flow:
- Fluids flow perpendicularly to each other.
Parallel Flow Heat Exchangers
- Fluids enter the exchanger and flow in the same direction.
- The hot fluid's temperature decreases, while the cold fluid's temperature increases along the exchanger.
- Heat transfer efficiency is limited due to the decreasing temperature difference.
- Temperature equalization can halt heat transfer.
Counter Current Flow Heat Exchangers
- Fluids flow in opposite directions within the exchanger.
- A more uniform temperature difference is maintained along the exchanger’s length.
- The hot fluid meets progressively cooler parts of the cold fluid, and vice versa.
- These have a higher heat transfer efficiency compared to parallel flow exchangers.
- Counter current flow is preferred when high efficiency is necessary.
Cross Flow Heat Exchangers
- Fluids flow perpendicular to one another.
- The hot fluid flows across the cold fluid.
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