During the operation of a five box...

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Question 1 of 205eccef9dbacbc34ba4d46076

During the operation of a five box refrigeration system, using a fixed capacity compressor, two additional boxes came on line with the two boxes already in the active cooling process. At the beginning of the cooling period for the two additional boxes, the operating conditions of the system would require the quantity (flow rate) of refrigerant to the compressor suction to do what?

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🔍 Key Concepts

• Behavior of a fixed capacity compressor when system load changes • Relationship between suction pressure and mass flow rate of refrigerant into the compressor • Effect on the evaporator side when additional refrigerated boxes are brought on line

💭 Think About

• When two more warm boxes are added, does the total cooling load on the system increase or decrease? How does that affect the evaporating (suction) pressure? • For a fixed displacement compressor, if suction pressure changes, what happens to the density of the suction gas and therefore the mass flow rate into the compressor? • Think about whether the compressor can instantly move more refrigerant by volume, or whether the system responds first by changing pressure on the low side.

✅ Before You Answer

• Be clear on what fixed capacity (fixed displacement) means for compressor volume flow per revolution • Consider whether suction pressure will initially tend to rise or fall when load suddenly increases before any control action • Check how a change in suction pressure would change the mass (not just volume) flow rate of refrigerant into the compressor.

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