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Effects of system control strategies on startup characteristics of R290 room air conditioners
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2020-03-07 , DOI: 10.1016/j.applthermaleng.2020.115166
Jianhua Wu , Jinbo Li , Che Wang , Yanjun Du , Rui Chen

The operation of R290 air conditioners at cold ambient temperatures can lead to sub-atmospheric suction pressures, risking the safety and reliability of such air conditioners. In this study, the effects of several system control strategies on the startup characteristics were investigated, with the goal of avoiding vacuums in air conditioners. The variations in the degrees of superheating and the changes in the flow patterns at key points were analyzed. The refrigerant migrations and pressure variations indicated that owing to the higher initial temperatures in a warm startup, the heat inertia of the compressor and indoor heat exchanger contributed to the formation of liquid refrigerant at the expansion valve inlet, as well as an increase in the suction pressure. Moreover, using larger initial expansion valve openings or a bypass tube between discharge and suction could increase the minimum suction pressures, by providing more R290 refrigerant to the low-pressure side at the beginning of startup.



中文翻译:

系统控制策略对R290室内空调启动特性的影响

R290空调在寒冷的环境温度下运行会导致吸入压力低于大气压,从而危及此类空调的安全性和可靠性。在这项研究中,研究了几种系统控制策略对启动特性的影响,目的是避免空调中出现真空。分析了过热度的变化和关键点的流型变化。制冷剂的迁移和压力变化表明,由于在暖启动中较高的初始温度,压缩机和室内热交换器的热惯性有助于在膨胀阀进口处形成液态制冷剂,并增加了吸气量。压力。此外,

更新日期:2020-03-09
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