Page 188 - Defrosting for Air Source Heat Pump
P. 188
182 Defrosting for Air Source Heat Pump
28
24 Fin in Circuit 1
Temperature of fin surface ( o C) 16 8 Fin in Circuit 3 o 195 s
20
Fin in Circuit 2
12
3.01 C
4
201 s
150 s 198 s
0
80 100 120 140 160 180 200 220 240
Time (s)
Fig. 6.31 Measured fin surface temperatures at the center of the three refrigerant circuits during
defrosting in Case 2.
28
24 Fin in Circuit 1
Temperature of fin surface ( o C) 16 8 Fin in Circuit 3 180 s
20
Fin in Circuit 2
12
o
4
1.93 C
130 s 182 s
184 s
0
80 100 120 140 160 180 200 220 240
Time (s)
Fig. 6.32 Measured fin surface temperatures at the center of the three refrigerant circuits during
defrosting in Case 3.
shown in Fig. 3.13 in Chapter 3.In Fig. 6.27, the defrosting durations for three circuits
are at 193, 197, and 193 s, respectively, from Circuit 1 to 3. In Fig. 6.28, their
defrosting durations are orderly at 187, 183, and 186 s, respectively. In Fig. 6.29,
the temperatures of three circuits reaching 24°C are orderly at 174, 172, and 175 s,
