Page 58 - Defrosting for Air Source Heat Pump

Uneven defrosting on the outdoor coil in an ASHP 49

Fig. 3.2 Details of the five-circuit outdoor coil and the locations of valves.

Table 3.1 Specifications for the outdoor coil of the experimental ASHP unit
Item Parameters Values Units

1 Height 850 mm
2 Width 590 mm
3 Fin height 152.4 mm
4 Fin width 44 mm
5 Fin pitch 2.1 mm
6 Fin thickness 0.115 mm
7 External diameter of tube 10 mm
8 Tube thickness 0.5 mm
9 Tube spacing 20 mm
10 Number of circuits 5 /
11 Number of tube rows 2 /
12 Circuit pitch (mm) 22 /
13 Material of tube Copper /
14 Material of fin Aluminum /
15 Fin type Plate /
16 Water-collecting tray material PVC /