Difficulty: Easy
Correct Answer: Saturated liquid
Explanation:
Introduction / Context:
Recognizing refrigerant states at key points in the vapour-compression cycle is vital for sizing heat exchangers and protecting the compressor. After compression, the hot superheated vapour enters the condenser, where it is first desuperheated and then condensed to liquid before throttling.
Given Data / Assumptions:
Concept / Approach:
Within the condenser, three regions may exist: desuperheating, condensation (phase change at essentially constant temperature for a pure refrigerant), and sometimes subcooling. The minimum requirement before the expansion device is liquid at saturation; subcooling is beneficial but not mandatory in the idealized description.
Step-by-Step Solution:
Verification / Alternative check:
On a p–h diagram, the condenser outlet lies on the saturated liquid line (or slightly to the left if subcooled). The expansion valve requires liquid to avoid flash-gas before the evaporator inlet.
Why Other Options Are Wrong:
Common Pitfalls:
Confusing the condenser outlet with the compressor discharge, or assuming subcooling without checking system design.
Final Answer:
Saturated liquid
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