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16 Cards in this Set
- Front
- Back
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What is a calorifier? |
A piece or equipment where heat is transferred from one fluid to another without the fluids mixing. (Heat exchanger) |
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What 3 functions do cooling towers perform? |
Dissipate heat from steam condenser Limit water use Provide low temp water to Condenser to maintain thermal efficiency |
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What are the 5 design elements of a cooling tower? |
Air circulation system Water distribution system Packing/fill to maximize contact between air and water Cooling water collection/discharge basin Mist eliminators |
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What are 3 things that affect tower efficiency? |
Water surface area Length of contact time Relative humidity |
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What are 2 classifications of heat exchangers? |
Direct contact and indirect contact |
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What are the most common type of heat exchangers? |
Shell and tube |
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What are 2 functions of baffles? |
Support tubes to prevent vibration and sagging Cause turbulence to increase heat transfer rate and prevent dead bypass areas |
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What are the 3 types of shell and tube exchangers? |
Fixed tubesheet U tube Floating head |
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What are the 4 rules which dictate what fluid goes through tubes and what fluid goes around the tubes? |
1) dirtier fluid goes inside tubes 2) higher pressure goes inside tubes 3) corrosive fluids goes inside tubes 4) fluid with lower heat transfer coefficient goes outside tubes |
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Which association specifies and standardizes exchanger sizes and parts to simplify design, construction, and parts replacement of hear exchangers? |
TEMA Tubular exchanger manufacturers association |
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What is the most common designation type of tube and shell exchangers? |
AES |
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What is another name for an immersion coil type heat exchanger? |
Storage type heat exchanger |
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A cooling tower uses what type of contact? |
Direct |
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What are 3 common problems of heat exchangers? |
Leaking tubesheets Fouling Vibration |
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What is fouling? Why is this a problem? |
Fouling occurs when undesirable deposits are on a heat exchanger. It increases resistance of fluid flow and heat transfer |
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When operating fluids are flammable or hazardous, what should not be used to clean them? |
Air |
