Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System

The air flow rate on the gas cooler side is one of key parameters affecting performance and running safety transcritical CO2 electric vehicle conditioning systems. After experimentally analyzing effects volume in cycle system performance, a novel method to evaluate optimal was proposed. In addition, effect (e.g., discharge pressure) explored. Finally, coupling compressor speed, ambient temperature also exhaustively assessed. It found that as temperature, at outlet pressure did not vary more than ±2%, corresponding optimal. For single-row dual-process microchannel evaporator used this work, recommended value 2500 m3·h−1. results could provide reference for fan speed design systems, especially under idling model.