Question

Reciprocating compressor sucks _________ pressure and low temperature refrigerant during suction stroke.

• A. Low
• B. Intermediate
• C. High
• D. Atmospheric

Hint:

In a refrigeration cycle, the compressor always draws low-pressure vapor from the evaporator and discharges high-pressure vapor to the condenser.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
A vapor compression refrigeration system consists of four primary components: an evaporator, a compressor, a condenser, and an expansion device.
The compressor acts as the heart of the refrigeration cycle, moving refrigerant through the system and increasing its pressure to facilitate heat transfer.

Step 2: Detailed Explation:
Let us alyze the refrigerant state during the compressor cycle:
- In the evaporator, liquid refrigerant absorbs heat from the cold space and boils, transitioning into a vapor state.
Because evaporation occurs at low temperatures to absorb heat, the resulting vapor refrigerant is at a low-pressure and low-temperature.
- During the suction stroke of a reciprocating compressor, the piston moves downward, creating a partial vacuum inside the cylinder.
This pressure difference opens the suction valve, drawing the low-pressure, low-temperature vapor refrigerant from the evaporator into the cylinder.
- During the subsequent compression stroke, the piston moves upward, compressing this vapor into a high-pressure, high-temperature gas before discharging it to the condenser.
- Thus, the suction stroke always draws in low-pressure refrigerant from the evaporator.

Step 3: Fil Answer:
The reciprocating compressor draws in low-pressure, low-temperature refrigerant vapor during its suction stroke.
Hence, the correct option is (A).