What is the estimated outcome when the liquid line is blocked?

• A. Increased cooling efficiency
• B. System overheating
• C. Refrigerant flooding
• D. No effect on overall performance

Answer: (B)

When the liquid line in a refrigeration system is blocked, the expected outcome is system overheating. This happens because the blockage prevents the proper flow of refrigerant from the condenser to the expansion device. As a result, the refrigerant cannot make its way into the evaporator where it would normally absorb heat.

Without sufficient refrigerant entering the evaporator, the system cannot effectively dissipate heat from the space being cooled. This lack of heat absorption leads to increased pressures in the system, causing the compressor to work harder. The compressor may run continuously without sufficient refrigerant flow, which can cause it to overheat, potentially leading to mechanical failure.

In contrast, increased cooling efficiency and no effect on overall performance are not viable outcomes from a blocked liquid line. The system has to operate under different pressures and conditions, which directly impacts performance. While refrigerant flooding may seem plausible, it typically refers to an excess of refrigerant in the evaporator, which is not the direct result of a blockage in the liquid line. Hence, the critical result of a blockage is indeed overheating within the system.