Impact of Elevated Ambient Temperatures on Capacity and Energy Input to a Vapor Compression System-Literature Review

摘要

The two most influential fundamental thermodynamic properties affecting refrigerant performance in the vapor compression are refrigerant's critical temperature and molar heat capacity. For a given application, a fluid with a lower critical temperature will tend to have a higher volumertic capacity and a lower coefficient of performance (COP). The difference between COPs is related to different levels of irreversibility because of the superheated vapor horn and the throttling process. The levels of irreversibility vary with operating temperatures because the slopes of the saturated liquid and vapor lines change, particularly when approaching the critical point.