Which statement regarding liquid receivers is incorrect?

The statement that liquid receivers are primarily heat exchange devices is not accurate. Liquid receivers are specifically designed to store refrigerant and manage its flow within a refrigeration system. Their main function is to accommodate fluctuations in the volume of refrigerant that circulates through the system, particularly when the expansion valve closes or when the system is under varying operational loads.

In more detail, liquid receivers serve several essential purposes, including compensating for varying volumes of refrigerant circulation and acting as a reservoir to maintain system stability. They do not perform heat exchange; rather, that function is typically associated with components like evaporators and condensers. By storing additional refrigerant, liquid receivers also help ensure that the condenser can remain drained and do not become overly saturated with liquid during operation.

Given these roles, it's clear that describing a liquid receiver primarily as a heat exchange device mischaracterizes its fundamental purpose within the refrigeration cycle.