LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Effects of system control strategies on startup characteristics of R290 room air conditioners

Photo from wikipedia

Abstract 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… Click to show full abstract

Abstract 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.

Keywords: strategies startup; air; startup characteristics; air conditioners; system control; control strategies

Journal Title: Applied Thermal Engineering
Year Published: 2020

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.