State of refrigerant in the basic vapour-compression cycle In an ideal analysis, the refrigerant is a dry saturated vapour at which location in the cycle?

Introduction / Context:Idealized vapour-compression cycle analysis often assumes specific refrigerant states at key nodes to avoid complexities like wet compression or excessive superheat.

Given Data / Assumptions:

• Ideal single-stage cycle with isentropic compression and throttling expansion.
• Negligible pressure drops in lines and heat exchangers.
• Compressor handles vapour only (no liquid).

Concept / Approach:To avoid wet compression, the suction condition is set as dry saturated vapour (or slightly superheated in practice). After compression the vapour is superheated; the condenser then desuperheats and condenses it to saturated liquid.

Step-by-Step Solution:Compressor suction: dry saturated vapour (ideal) → safe for compression.Compressor discharge: superheated vapour at high pressure.Condenser outlet: saturated or subcooled liquid.Expansion device outlet: low-quality mixture entering evaporator.

Verification / Alternative check:p–h and T–s diagrams in textbooks show state 1 at the saturated vapour line (or slightly to the right if superheated) for an idealized cycle.

Why Other Options Are Wrong:Before the condenser the fluid is generally superheated; after the condenser it is liquid; after the expansion device it is a low-quality mixture, not dry vapour.

Common Pitfalls:Assuming “before the condenser” equals saturated vapour; remember compression adds superheat that must be rejected before condensation begins.

Final Answer:Before entering the compressor (compressor suction)