435 Flashcards
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 the 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 condenses are alike in the following ways
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 lower 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 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 cause 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
