Azeotropic Blend - ANSWER-Mixture of refrigerants that condenses and boils at fixed temperatures and pressures
Zeotropic Blends - ANSWER-Mixture of refrigerants that will separate when boiled in the evaporator.
Saturated Operating Pressures - ANSWER-Saturation points should be within operatin...
RETA Chapter 3
Questions & Answers
100% Correct!!
Azeotropic Blend - ANSWER-Mixture of refrigerants that condenses and boils at fixed temperatures
and pressures
Zeotropic Blends - ANSWER-Mixture of refrigerants that will separate when boiled in the evaporator.
Saturated Operating Pressures - ANSWER-Saturation points should be within operating limits of
standard refrigeration equipment
Evaporator pressure should be greater than atmospheric pressure so refrigerant will leak out instead
of air getting in
Discharge Temperatures of Reciprocating Compressors - ANSWER-Every degree the vapor is above
the saturation temperature when entering the compressor, the theoretical discharge temperature
will be approximately 1 degree higher
Fully insulate the suction line between the compressor a nd the evaporator to minimize the heat
pickup by the refrigerant before it is compressed.
Discharge Temperature of Screw Compressors - ANSWER-Require large amounts of oil for sealing the
compression process by filling the rotor-to-rotor and rotor-to-housing clearance gaps with oil.
Oil is cooled so it may be recirculated through the compressor
Circulating oil absorbs much of the heat of compression.
Compressor selection - ANSWER-Must be able to handle the volume of refrigerant vapor coming
from the evaporator (expressed in CFM)
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