Chapter 12 Flashcards
Aerial coolers alone are not used for:
A) Cooling in series with water coolers
B) Cooling where water fouling is a concern
C) Cooling below ambient temperature
D) Where water supply is limited
E) Cooling before water coolers
C
In a counter flow hyperbolic cooling tower, the cooling is most dependent on:
A) Adequate air flow
B) A cooling water drift
C) Clean suction screens
D) Density difference of the air
E) Adequate water-flow over the tower
D
A jacketed pipe is:
A) Type of cooling tower fill
B) Pipe with fins attached
C) A double pipe exchanger
D) Aerial cooler
E) Insulated pipe
C
Fixed tube sheet chemical cleaning is used to clean:
A) The inside of the tubes
B) The outside of the tubes
C) Only the tube sheets
D) All of the above
E) None of the above
B
Advantages of a PHE include the:
- Rapid start-up
- Ease of leakage detection
- Ability to use low flow rates for erosion
- Ability to cool toxic materials
- Minimal heat loss
A) 1, 3, 5
B) 3, 4, 5
C) 1, 3, 4
D) 1, 2, 5
E) 2, 3, 4
D
A disadvantage of counter-flow cooling towers is:
A) The towers are too high
B) The structure must be heavier to withstand the added weight
C) The louvers can freeze and cause collapse of the towers
D) The towers have large electric motors
E) The towers have a very high complex path for the water flow
D
Hyperbolic towers are used because they:
A) Work in humid climates
B) Are extremely dependable
C) Are predictable in operation
D) Cost less to maintain
E) All of these are correct
E
Temperatures in aerial coolers are not controlled by:
A) Natural draft
B) Louvers open or closed
C) Stop/start fans
D) Variable speed fans
E) Forced draft fans
A
Atmospheric spray cooling towers do not depend on ____________, when cooling fluids.
A) Tower fill
B) Wind direction
C) Wind drift
D) Atmospheric conditions
E) Spray
A
___________ works on the principle of cool air contacting and removing heat from warm water.
A) A shell and tube exchanger
B) A de-aerator
C) An evaporator
D) A cooling tower
E) A circulating pump
D
