Abstract: A comparative study was conducted on the energy-saving effect of a certain AQR-TZ42k refrigerator under different capillary flow conditions. The experimental study found that: using 12 L/min, 7 L/min, 5 L/min capillary flow were tested, when the capillary flow is 5 L/min, the minimum power consumption in the stable section of the whole machine is 0.70 kW·h/24 h, with the increase of the flow, the power consumption increased by 3%, 14% respectively. Dual capillary time sharing control, the capillary flow rates of 5 L/min (low load) +5 L/min (high load), 7 L/min (low load) +7 L/min (high load), 12 L/min (low load) +12 L/min (high load) were used for the test, respectively. When the combination of 5 L/min (low load) +5 L/min (high load) is adopted, the power consumption of the whole machine (including the defrosting section) is the lowest 0.80 kW·h/24 h, and the power consumption increases by 6% and 19% with the increase of flow. The experimental result proves that the energy saving effect of the refrigerator is improved by controlling the capillary flow rate by time sharing.

Key words: Refrigerator, Energy saving, Capillary flow rate, Time sharing