Heat Exchanger Practice Quiz Flashcards
(29 cards)
In a split backing ring floating head heat exchanger, what part is bolted to the split backing ring?
Floating head cover
If the channel head of a fix tube heat exchanger has two baffles and the rear head has one baffle, how many passes would the tube side have?
4
How many longitudinal shell side baffles are required to get achieve four passes on the shell side of an exchanger?
3
Which type of cooling tower uses a high pressure water spray to create the airflow used to cool it?
Venturi
In the parallel flow heat exchanger shown, Fluid 2 is the hotter of the 2 fluids at the exchanger inlet. Where would the lowest temperature fall?
image has; both fluids in parallel flow, fluid 1comes in at inlet, fluid 2 to be cooled.
Its lowest temperature will fall between the inlet
temperatures of the 2 fluids
The purpose of a heat exchanger is to:
Transfer heat from one fluid to another without mixing
A plate type heat exchanger has (small / large) surface area and (is / is not) well suited to high pressure applications.
Large; is not
When lifting a large tube bundle, where do you support?
Support the bundle under the baffles or tube sheet
A heat exchanger operates at 275 psi. What hydrostatic test pressure should be applied?
412.5psi, 1.5 times the operating pressure.
What best describes the function of a heat exchanger?
Transfers heat from a warm fluid to a cooler fluid without mixing
What baffle determines the number of shell side fluid passes in a shell and tube heat exchanger?
Longitudinal baffles
What is the purpose of drift eliminators in a mechanical draft cooling tower?
To maintain consistent cooling tower flow rates
The fluid flowing through the inside of the tubes on a u-tube exchanger is usually:
Dirty or Clean?
Clean, u-tube hard to clean
What baffle has the same function as Disc and Doughnut baffles?
Segmental
The shell side of a fixed tube sheet exchanger is cleaned by:
Flushing
What baffle prevents erosion of the tubes in exchangers with high shell-side inlet velocities?
Impingement
What affects cooling tower efficiency?
- Contact time between air and water
- Relative Humidity in the area
- Temperature difference between air and water
A double pipe heat exchanger has the advantage of being:
1) Well-suited for high pressures and temperatures
2) Modular; capacity can be added as required
3) Easy to service
As a safety precaution when removing the channel head for tube sheet inspection, which flange bolts should be loosened first?
Bottom, if any pressure left in the exchanger, this allows fluid to drain down safely onto the floor instead of spraying out onto the workers.
What property is required of a material used for heat exchanger tubing?
High Thermal Conductivity
What will conduct heat energy most effectively?
Metals
What heat exchanger is most likely to suffer from thermal stresses causing tube sheet leakage?
Fixed Tube Sheet
How does a cooling tower lower the process water temperature?
Evaporation of a portion of the water to be cooled
Which heat exchanger flow path arrangement can the two fluids reverse temperatures if given enough time in contact?
Counter-Flow
