Definition
A component in an aircraft vapor-cycle air conditioning system that serves three functions: it stores liquid refrigerant between the condenser and the expansion valve, removes any moisture from the refrigerant using a desiccant, and filters out solid contaminants. It is installed on the high-pressure liquid side of the system.
Plain English
A small tank in the aircraft air conditioning system that holds the liquid coolant, dries it, and filters it before it continues through the system.
Context Anchor
Seen during aircraft air-conditioning system descriptions, inspections, servicing, and troubleshooting.
Derivation
The name describes the two main jobs of the unit. 'Receiver' because it receives and holds the liquid refrigerant coming from the condenser. 'Dryer' because it contains a desiccant material that pulls moisture out of the refrigerant. Moisture in a refrigerant system is a serious problem because it can freeze at the expansion valve and block the flow.
Why Pilots Care
Prevents moisture from freezing in the expansion valve and blocking refrigerant flow, which would disable cabin cooling.
Intuition Check
A receiver-dryer is not a radio receiver, and it does not dry cabin air like a household dehumidifier. It works inside the air-conditioning system to hold and dry the refrigerant.
Example Sentence 1
The mechanic replaced the receiver-dryer after the air conditioning system was opened for repair, since moisture had likely entered the lines.
Example Sentence 2
Before recharging the vapor-cycle system, the mechanic installed a new receiver-dryer to protect against contamination.