Page 232 - Defrosting for Air Source Heat Pump

Energy transfer during defrosting 227

Table 8.1 Specifications of the tailor-made three-circuit outdoor coil
Item Parameter Value Unit

1 Height of the outdoor coil 500 mm
2 Width of the outdoor coil 590 mm
3 Thickness of the outdoor coil 44 mm
4 Fin height 152.4 mm
5 Fin width 44 mm
6 Fin thickness 0.115 mm
7 Fin pitch 2.1 mm
8 Fin type Plate –
9 Tube external diameter 10 mm
10 Tube thickness 0.5 mm
11 Tube spacing 20 mm
12 Circuit pitch 22 mm
13 Number of tube rows 2 –
14 Number of circuits 3 –
15 Number of water-collecting trays 3 –
16 Number of water-collecting cylinders 3 –
17 Number of wind boards 2
18 Material of tube Copper –
19 Material of fin Aluminum –
20 Material of wind board Wood
21 Material of water-collecting tray PVC –
22 Material of water-collecting cylinder PVC –
23 Volume of cylinder A, B, and C 500 mL
24 Volume of cylinder D 2000 mL

Table 8.2 Specifications of the prototypical three-circuit indoor coil
Item Parameter Value Unit
1 Number of circuits 3 /
2 Number of tube rows in each Circuits 1, 2: 6 2; Circuit 3: /
circuit 4 2
3 Tube spacing 5 mm
4 Length of indoor coil 103 cm
5 Fin type Wavy /
6 Fin length Circuits 1, 2: 125; Circuit 3: 85 mm
7 Fin width 25 mm
8 Fin pitch 1.3 mm
9 Fin thickness 0.08 mm
10 Tube external diameter 7 mm
11 Material of fin Aluminum /
12 Material of tube Copper /