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UNIT 16 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
16-1) What is the purpose of the evaporator in the refrigeration system?
16-2) Why does the heat flow into the evaporator?
16-3) What is the difference between sensible and latent cooling?
16-4) Explain how an evaporator can dehumidify the air.
16-5) Define product as it relates to refrigeration.
16-6) List the four broad types of evaporator applications.
Domestic refrigeration
16-7) List the types of water-cooling evaporator construction?
16-8) Where are plate-type evaporators used?
16-9) Why are fins added to the copper tubing on tube-and-fin coils?
16-10) How is the mechanical tight bond created between the refrigerant tube and the
fin on fin coils?
16-11) What are two ways of adding corrosion protection to the aluminum fins on
a fin coil?
16-12) Explain the difference between the fin pitch between air conditioning coils
and commercial refrigeration coils?
16-13) Explain the difference in operation between a single row evaporator and
a multi-row evaporator?
16-14) In what shapes are air conditioning tube and fin coils available?
16-15) Define condensate blowoff.
16-16) What is the maximum velocity for air through a coil to avoid blowoff?
16-17) Define bypass factor.
16-18) In what two ways should an air conditioning evaporator condition the air?
16-19) List the items that can affect a coil’s dehumidification ability.
Bypass factor – lower bypass factor produces more
16-20) What are the common ways that manufacturers list a coil’s ability to
dehumidify the air?
16-21) Explain the relationship between the static pressure drop across an evaporator
coil and the airflow going over the coil.
16-22) Why do coil manufacturers specify both wet and dry coil static pressure
drops?
16-23) How does a coil being dirty affect its static drop?
16-24) What is a direct expansion evaporator?
16-25) What is a flooded evaporator?
16-26) What type of a system uses a flooded evaporator?
16-27) What is the purpose of the trap in a condensate drain?
16-28) Why should the bottom coil be first on, last off when using a face control to
unload a coil?
16-30) What is brine?
16-31) Why are direct expansion evaporators typically fed at the bottom and drawn
from the top?
16-32) Explain the difference between a direct expansion chiller and a flooded
chiller?
16-33) List the three general temperature ranges for commercial refrigeration
evaporators and give examples of each.
16-34) What is meant by an AHRI match?
