Page 73 - Defrosting for Air Source Heat Pump

64 Defrosting for Air Source Heat Pump

Fig. 3.16 Measured fin temperatures at the center of the three refrigerant circuits during
defrosting in Case 1.

Fig. 3.17 Measured fin temperatures at the center of refrigerant circuits in Case 2.

reached 24°C almost at the same time, at 167, 166, and 168 s, respectively. The time
differences of 6 and 18 s in Case 2 and Case 3 compared to that in Case 1 clearly
showed that it would take longer for the bottom circuit to reach 24°C when fewer trays
were installed, so that a defrosting operating was prolonged and more energy
consumed.