有内热源房间空调器制冷系统热力膨胀阀的匹配研究.pdfVIP

文章编号：CAR148 有内热源房间空调器制冷系统热力膨胀阀的匹配研究 臧润清 孙志利 王洪旭 （天津商业大学制冷与空调工程系 天津市制冷技术重点实验室，天津 300134 ） 摘 要 为了保持热源的降温，应用于有内热源房间的空调器一年四季都需要运行。由于热力膨胀阀特性的限制，空调器在 低环境温度下，蒸发器供液不足，使得整机制冷量和 COP 增幅不高。为了改善整机性能，在焓差实验室对空调器进行了性 能测试，得到了-5～35℃环境温度下蒸发压力、冷凝压力、制冷量和 COP 等热工参数变化。论文结合热力膨胀阀的型号和 特性，研究了热力膨胀阀在变工况条件下与系统其它部件的匹配关系，旨在扩大膨胀阀的工作区间，提高低环境温度下房间 空调器的效率。研究表明，兼顾较大范围环境温度变化匹配热力膨胀阀，应扩大 50%～100%开度工作区间，缩小 100%～120% 开度工作区间，降低制冷系统设备、部件和管道阻力，避免两个震荡区进入使用范围。 关键词 热力膨胀阀 空调器 匹配关系 Zang Runqing Sun Zhili Wang Hongxu (Tianjin Key Laboratory of Refrigeration Technology, Tianjin 300314, China) Abstract Air-conditioner that applied in the room with internal heat source has to run all the year round in order to keep heat source cooling. Due to the limit of property of thermostatic expansion valve, the less supplying refrigerant for evaporator makes refrigerating capacity and COP descent at low outdoor temperature. To improve the performance of air-conditioner, we tested it in enthalpy-difference laboratory and got evaporation pressure, condensing pressure, refrigerating capacity and COP at -5-35 ℃ outdoor temperature. The paper, combines with type model and property of thermostatic expansion valve, studies matching relationship between thermostatic expansion valve and other parts of system that aimed to expand workspace and increase efficiency of room air-conditioners at lower ambient temperature. The study indicates that match thermostatic expansion valve ,considering greater change in outdoor temperature, should enlarge work opening span in 50%～100% thus reduce in 100%～120% and reduce the drag force of refrigerating system equipment, parts and resistance of ducting, and prevent the