Please size the hot water return piping based on the circulation water volume. Please refer to table
5.3 when do the preliminary selection.
Hot Water Supply Piping Size (mm)
20-25 32 40 50 65 80 100 125 150 200
Hot Water Return Piping Size (mm)
20
20 25 32 40 40 50
65
80
100
Table 5.3 Return Piping Size
1.10.
Piping Insulation
Please insulate all the hot water piping with neoprene insulation material with thickness higher
than 20mm. (Please ensure the equal insulation performance if other material is used). Please add
the extra protection coat (galvanized steel or aluminum plate) if the piping is located outside. If the
system is installed in the area with the minimum ambient temperature lower than 0 Celsius,
insulation is also required on the cold water piping. Please refer to table 5.4 for the hot water
piping insulation requirement.
Hot Water Piping Size (mm)
15~20
25~50
65~100
＞
100
Neoprene Insulation Thickness (mm)
20
30
40
50
Table 5.4 Neoprene Insulation Thickness for Hot Water Piping
1.11.
Water Pump Selection
Please refer to table 5.5 for detailed requirement for the circulation pump selection.
Pump
Flow Rate (m3/h)
Heat Pump Pressure Drop
(m
3
/h)
Remarks
Circulation
Pump
6.5 m3/h × Heat pump
quantity
80 kPa
Hot water
pump
Table 5.5 Water Pump Selection Requirement
1.12.
Tank Design
Please see picture 5.5a (vertical tank) and 5.5b(horizontal tank) for the requirements of hot water tank
design and consider following items during the tank design:
