Which component controls suction pressure in refrigeration systems?

The component that controls suction pressure in refrigeration systems is the evaporator pressure regulator. This device is crucial for ensuring that the pressure within the evaporator remains at an optimal level for proper operation. It does this by adjusting the flow of refrigerant to match the cooling demand and to maintain the evaporator pressure within a specific range.

When the suction pressure rises too high, the evaporator pressure regulator restricts the flow of refrigerant to prevent overcharging, thus maintaining efficient operation and protecting the system from potential damage. By dynamically adjusting to changes in load and providing a stable suction pressure, these regulators ensure the system operates efficiently and maintains a steady cooling performance.

The other components mentioned do not specifically play the same role in controlling suction pressure. For instance, condenser cooling water is primarily concerned with rejecting heat from the refrigerant, while pressure relief valves serve the purpose of preventing excessive pressure buildup in the system. Refrigeration flow relates to how the refrigerant circulates through the system but does not inherently control the suction pressure. Thus, the evaporator pressure regulator is the key component that effectively manages this critical aspect of refrigeration systems.