435 Flashcards
(25 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
pressure, temperature
Spring-loaded relief valves protect a system against explosion by acting in response to high _____. Fusibie 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 a water-cooled condenser system, “makeup water” is used for
replacing water lost through evaporation
In the _____ system, water passes through the condenser to cool the refrigerant. The water is then _____
wastewater, discharged to the sewer
Tube-in-tube, shell-and-coll, 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
What type of cooling tower is shown in the drawing below?
Induced draft, counterflow
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 desuperheating 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 3 months
fan blades for tightness
One of the main categories of water-related problems in an air-conditioning or refrigeration system
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
