In a cascade refrigeration system:
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A.
refrigeration effect is obtained using a single refrigerant
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B.
two different refrigerants are used, refrigerant with low NBP is placed in the evaporator and refrigerant with high NBP is placed in condenser
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C.
two different refrigerants are used, either of the refrigerants can be placed in the evaporator or condenser side
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D.
two different refrigerants are used, refrigerant with high NBP is placed in evaporator and refrigerant with low NBP is placed in condenser
Correct Answer:
B. two different refrigerants are used, refrigerant with low NBP is placed in the evaporator and refrigerant with high NBP is placed in condenser
Explanation:
In a cascade refrigeration system, two distinct refrigerants operate in separate cycles linked by a heat exchanger. The refrigerant with a lower normal boiling point (NBP) is used in the low-temperature cycle's evaporator to achieve cooling, while the refrigerant with a higher NBP is used in the high-temperature cycle's condenser. This arrangement allows the system to reach extremely low temperatures more efficiently than a single-stage system by utilizing the optimal properties of different refrigerants for specific temperature ranges.
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