Which components change the refrigerant's pressure?

Which components change the refrigerant's pressure?

• A. Condenser, Evaporator
• B. Compressor, Metering Device
• C. Compressor, Condenser
• D. Evaporator, Metering Device

Answer: (B)

The key idea is that pressure in a vapor-compression cycle is controlled by the devices that actively compress and expand the refrigerant. The compressor raises the refrigerant’s pressure from the low-pressure side to the high-pressure side, pushing it toward the condenser. The metering device then drops that high pressure to the low side before the refrigerant enters the evaporator, allowing it to boil and absorb heat. Condenser and evaporator mainly handle heat transfer and phase changes, not the primary creation of pressure differences. They maintain the high and low pressure conditions created by the compressor and metering device, but they don’t actively increase or decrease pressure themselves.

The key idea is that pressure in a vapor-compression cycle is controlled by the devices that actively compress and expand the refrigerant. The compressor raises the refrigerant’s pressure from the low-pressure side to the high-pressure side, pushing it toward the condenser. The metering device then drops that high pressure to the low side before the refrigerant enters the evaporator, allowing it to boil and absorb heat.

Condenser and evaporator mainly handle heat transfer and phase changes, not the primary creation of pressure differences. They maintain the high and low pressure conditions created by the compressor and metering device, but they don’t actively increase or decrease pressure themselves.