Page 205 - Defrosting for Air Source Heat Pump

The influence of refrigerant distribution on defrosting 199

28
Fin in Circuit 1
24 Fin in Circuit 2
Fin in Circuit 3
20 T > T ; T > T 2
Fin surface temperature ( o C) 12 8 T > T > T 2
3
1
3
16
1
3

4
210 s 217 s
0
80 100 120 140 160 180 200 220 240
Time (s)
Fig. 7.6 Measured fin surface temperature at the center of the three refrigerant circuits during
defrosting in Case 1.

28
Fin in Circuit 1
24 Fin in Circuit 2
Fin in Circuit 3
20
Fin surface temperature ( o C) 12 8 T > T ; T > T 2
16
3
3
1

4
165 s 182 s
0
80 100 120 140 160 180 200 220 240
Time (s)
Fig. 7.7 Measured fin surface temperature at the center of the three refrigerant circuits during
defrosting in Case 2.