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14 Cards in this Set
- Front
- Back
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Heat Exchanger |
Transfers heat or energy from one fluid to another without putting them in direct contact |
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What is the purpose of a heat exchanger |
To Change temperature, phase or energy Heat Recovery |
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The heat exchanger unit names depend on what? |
The main or primary stream |
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What are the “temperature” heat exchanger units? |
Heater Chiller Cooler |
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What are the “Phase Change” Heat exchanger units? |
Condenser Re-boiler Boiler |
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What are the “heat recovery” heat exchanger units? |
Cross Exchanger Economizer |
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Characteristics of the Shell and Tube exchangers |
Design Pressure and Temperature: Unlimited Fluids: Liquids/Vapours Heat transfer performance: Base Case Space requirements: Base Case Cost: Base Case Corrosion Resistance: Base Case Weight: Base Case Add capacity: Limited Fouling tendency: promoted fouling, tolerant to build up Maintenance: High pressure water needed to clean Leak Prevention: Robust Design methods: Well Established |
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Plate and Frame Qualities |
Design Pressure and Temperature: Limited to 2000kPag and 125C due to elastomer gaskets Fluids: Liquids Heat transfer performance: 2-3 times better than shell and tube Space requirements: less than ST Cost: Less than St Corrosion Resistance: Less than ST Weight: Less than ST Add capacity: Easy Fouling tendency: not tolerant of build up Maintenance: labour intensive Leak Prevention: gaskets aren’t robust, metal shrouds could be added, Design methods: proprietary due to unique plate designs |
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Air cooled Heat exchanger |
Required of ambient air is the only available cooling medium |
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Is the Temperature in the hot stream, warmer at the inlet or the outlet? |
Inlet |
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Is the Temperature in the cold stream warmer at the inlet or the outlet? |
Outlet |
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Define Counter-Current Flow Exchange |
The streams run in opposite directions |
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Define Co-Current Flow Exchange |
Both streams travel in one direction |
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Why are Shell and Tube heaters used with high flow rate process streams instead of the double pipe heat exchanger? |
They can handle high flow rates, and they have baffles to increase the residence time of the stream causing a higher rate of heat exchange |
