308-变频空调器制冷效率提升潜力分析.pdfVIP

变频空调器制冷效率提升潜力分析 ☆ ∆ 清华大学 崔梦迪 王宝龙 丁连锐 石文星 李先庭 摘要：变频空调器具有随负荷变化调节运行频率的节能优势，对其实际运行状态下能量 利用情况的分析研究亟需开展。本文基于实验数据对变频空调器在不同运行状态下的性能进 行了㶲分析，以明确季节性能提升方向。在此基础上，对蒸发器的内外侧热阻进行了分离， 以明确换热强化目标。结果表明：低频运行时，蒸发器是变频空调器主要的不可逆损失部件， 且管内侧热阻可上升至总热阻的44%，远超过额定工况下的热阻占比。蒸发器制冷剂侧的传 热强化是变频空调器制冷效率提升的关键。 关键词：变频空调器 低频运行 㶲分析 不可逆损失 蒸发器 热阻 Analysis on potential to enhance the energy efficiency of inverter air conditioners By Cui Mengdi★, Wang Baolong, Ding Lianrui, Shi Wenxing and Li Xianting Abstract:The operating frequency can change with variable heating and cooling load, which gives invert air conditioners energy saving advantage compared to traditional air conditioners. In order to ascertain the energy utilization of inverter air conditioners, exergy analysis based on the experimental data has been conducted in this study for evaluating the performance of inverter air conditioners in different operating states. The analysis will contribute to clarify the improvement direction of the seasonal performance in invert air conditioners. The results indicate that most exergy loss in low-frequency operating states occurs in the evaporator. Furthermore, the thermal resistance of the refrigerant side in the evaporator goes up to 44% of the total thermal resistance, which greatly exceed the thermal resistance distribution in the normal condition. Heat transfer enhancement on the refrigerant side of evaporators is the key to improve the refrigeration efficiency of inverter air conditioners. ★ Keywords:inverter air conditioner, operation at low frequency, exergy analysis, irreversible loss, evaporator, thermal resistance ★ Tsinghua University, Beijing, China 0 引言 随着生活水平日益提升，居民对室内环境控制需求的快速增长。目前我国已成为房间空 调器生产和消费大国。在节能减排大背景下，空调器变频技术快速发展，其可随室内外环境 变化调节运行频率，具有较大的节能优势。如何进一步提高变频空调器的能效已成为制冷空 ☆ 作者简介：崔梦迪，男，1995 年10 月生，清华大学建筑技术科学系, 硕士研究生； ∆ 通讯作者：王宝龙，副教授，邮编100084, 清华大学建筑技