ESCO Air Conditioning Practice Exam

What happens during the de-superheating phase in a condenser?

1. Condensed liquid is cooled further

2. Heat is transferred to the surroundings

3. Superheated vapor is cooled to a saturated state

4. Vapor leaves the condenser

The correct answer is: Condensed liquid is cooled further

During the de-superheating phase in a condenser, the superheated vapor coming from the compressor is cooled down to its saturation point. This process occurs after the vapor has already released a significant amount of heat in the condenser, leading to the formation of condensed liquid. The purpose of the de-superheating phase is to ensure that the vapor is fully saturated before it enters the expansion device, allowing for efficient and effective cooling in the system. Therefore, choice A is correct. Choice B is incorrect because the de-superheating phase is not focused on transferring heat to the surroundings, but rather on further cooling the vapor itself. Choice C is incorrect because de-superheating does not cool the superheated vapor to a saturated state directly; it simply cools it down to its saturation temperature. Choice D is also incorrect because vapor does not leave the condenser during the de-superheating phase; instead, it continues through the process to be further condensed and prepared for the expansion device.