TPC435 Flashcards
(24 cards)
The capacity of a condenser is affected by the:
Area of contact with the cooling medium
Natural-draft air-cooled condensers and forced-air condensers are alike in that both types:
Depend on air circulating over the coils
Low-ambient control in air-cooled condenser can be achieved by:
Closing the dampers
Spring-loaded relief valves protect a system against explosion by acting in response to high ______. Fusible plugs act in response to high ______.
Pressure; temperature
Periodic maintenance of air-cooled condensers includes doing which of the following every three months?
Checking all belts and pulleys
In the ______ system, water passes through the condenser to cool the refrigerant. The water is then ______.
Wastewater; discharged to the sewer
In a water-cooled condenser system, “makeup water” is used for:
Replacing water lost through evaporation
Tube-in-tube, shell-and-coil, and shell-and-tube condensers are alike in the following way(s):
Liquid refrigerant collects at the bottom
A condenser has a pressure-relief device that ______ if the refrigerant pressure becomes too high.
Releases refrigerant
Generally, how long should you allow a chemical cleaner to stand in a condenser?
A few hours
Which of the following can increase the capacity of a cooling tower or a spray pond by the greatest amount?
Increase in air velocity across the surface
Which components in the water-circulating system for a cooling tower or spray pond are used to keep the concentration of minerals low?
Bleedoff valve
The capacity of a cooling tower can be controlled by means of (a):
Diverting valve
As part of maintaining a cooling tower, you should check the ____________________ everyday.
Float valve for clogging
The basic classifications for evaporative condensers are:
Blow-through and draw-through
An evaporative condenser may include a de-superheating coil for the purpose of:
Reducing the formation of scale
Which of the following methods will maintain condensing pressure during cold weather operation?
Circulating water intermittently
What will prevent the water in an evaporative condenser from freezing during cold weather?
Installing a sump heater
As a part of maintaining an evaporative condenser you should check the ________________ every three months.
Fan blades for tightness
One of the main categories of water-related problems in an air-conditioning or refrigeration system is:
Corrosion
Corrosion in a water-cooled system can be caused by:
Biological organisms
Scale formation can be reduced in a refrigeration system by adding _________ to the cooling water.
Acid
Bacteria and algae can be controlled in a refrigeration system by adding ______ to the cooling water.
Chlorine
Chemical deterioration in a wooden cooling tower can be controlled by:
Keeping the pH of circulating water in the 6.0 to 7.5 range
