Question 191Refrigeration & AC - Assistant Engineer

The correct answer is A) excessive condenser cooling water flow. Explanation: In a refrigeration system, the compressor is responsible for circulating the refrigerant through the system. The compressor's head pressure is a key indicator of the system's performance. If the compressor head pressure is low, it can be caused by excessive condenser cooling water flow. This excessive flow reduces the temperature of the refrigerant as it passes through the condenser, preventing the refrigerant from fully condensing. As a result, the compressor has to work harder to maintain the required pressure, leading to low head pressure. The other options are incorrect because: B) insufficient cooling water flow would lead to high head pressure, C) excessive refrigerant would cause high head pressure, and D) air in the system would disrupt the refrigerant cycle and also lead to high head pressure.