Commercial refrigeration Chapter 10
Questions and Answers 100% Correct
What is the proper temperature of a meat case? - ANSWER - 28 to32°
What is a parallel rack system - ANSWER - A system of multiple compressors that share a
common source of refrigerant and oil to refrigerate a group of cases.
Why are parallel rack systems used in supermarket refrigeration? - ANSWER - They provide
excellent temperature control and affective capacity control and they are more energy efficient
then separate condensing units
With such long piping runs how does the rack system ensure oil is return to the compressors? -
ANSWER - By using oil separators to capture oil before it leaves the compressor rack
What determines when rack comepressers cycle on and off - ANSWER - Pressure and
temperature controls on the rack monitor the refrigeration load and cycle the compressors
How are case temperatures regulated in a parallel rack system - ANSWER - EPR valve
In supermarkets where are the EPR valve is located - ANSWER - At the compressor rack
suction header
For every degree of sub cooling at the Trev how much of an increase in evaporator capacity will
there be? - ANSWER - 0.5 percent
What is the maximum subcooling used in many modern supermarket refrigeration systems? -
ANSWER - 45 degrees
What is heat reclaim - ANSWER - It is the removal of superheat from the hot gas to heat the
building or whater
Questions and Answers 100% Correct
What is the proper temperature of a meat case? - ANSWER - 28 to32°
What is a parallel rack system - ANSWER - A system of multiple compressors that share a
common source of refrigerant and oil to refrigerate a group of cases.
Why are parallel rack systems used in supermarket refrigeration? - ANSWER - They provide
excellent temperature control and affective capacity control and they are more energy efficient
then separate condensing units
With such long piping runs how does the rack system ensure oil is return to the compressors? -
ANSWER - By using oil separators to capture oil before it leaves the compressor rack
What determines when rack comepressers cycle on and off - ANSWER - Pressure and
temperature controls on the rack monitor the refrigeration load and cycle the compressors
How are case temperatures regulated in a parallel rack system - ANSWER - EPR valve
In supermarkets where are the EPR valve is located - ANSWER - At the compressor rack
suction header
For every degree of sub cooling at the Trev how much of an increase in evaporator capacity will
there be? - ANSWER - 0.5 percent
What is the maximum subcooling used in many modern supermarket refrigeration systems? -
ANSWER - 45 degrees
What is heat reclaim - ANSWER - It is the removal of superheat from the hot gas to heat the
building or whater
