Which two components are primarily responsible for controlling the pressure in a refrigeration system?

The correct answer highlights the key components in a refrigeration system that regulate pressure. The compressor and the metering device play crucial roles in controlling the pressure throughout the system.

The compressor is responsible for raising the pressure of the refrigerant. It compresses the low-pressure refrigerant vapor from the evaporator into a higher-pressure vapor that can then be sent to the condenser. This increase in pressure is essential for the refrigeration cycle to function effectively, as it allows for the refrigerant to release heat in the condenser.

The metering device, which can be an expansion valve, capillary tube, or another form of metering device, controls the flow of refrigerant into the evaporator. It lowers the pressure of the refrigerant as it enters the evaporator, allowing it to absorb heat and provide cooling. By adjusting the flow rate, the metering device regulates the pressure in the evaporator section, which is critical for optimizing system performance and efficiency.

In contrast, the other options include components that either do not primarily influence pressure control or are part of the cycle without the same direct impact on pressure regulation.