Air-to-water Heat Pump
18
Inner
diameter(mm)
Corresponding heating capacity of
directly-heated inlet pipe(kW)
Corresponding heating capacity of outlet water
pipe and circulating inlet pipe(kW)
15
0~12
0~3
20
12~21
3~5
25
21~41
5~10
32
41~67
10~16
40
67~105
16~26
50
105~197
26~49
65
197~333
49~83
80
333~504
83~126
100
504~788
126~197
125
788~1232
197~308
150
1232~1774
308~443
200
1774~3154
443~788
250
3154~4929
788~1232
NOTICE:
Directly-heated inlet pipe diameter is calculated according to the double of nominal water yield
of the unit and the recommended flow speed.
10.2 Model Selection of Water Pump
The highest temperature of water pump on medium shall not below 70
℃
.
Model selection of circulating pump:
Rated lift of circulating water pump
Water res
∑
Local res Resistance coefficient ×L+Z
L: Total length of circulating water pipeline; Z: Height difference of circulating inlet and outlet of water
tank; Resistance coefficient can be 0.05 in estimate, pressure of the water column of 5 meters.
Flow of circulating water pump: Circulating water flow of a single unit ×quantity
Model
Circulating water resistance(kPa)
Circulating water resistance(m)
GRS-Cm18PdRe/NhA-M
27
2.7
NOTICE:
The required water pump parameter is the rated value, not the max .value, when selecting model for
water pump, please pay attention to the nominal flow and lift of water pump on the nameplate.
For example, when installing a unit, based on the above calculation, circulating water flow is 6.2m
³
/h and the lift is 15m.There are two sets of water pump for selection, in the end, water pump 2 is selected
because of its qualified flow and lift.
Water pump model
Max. flow(m³/h)
Max. lift(m)
Confirm flow curve
The lift when water flow is 6.2m³/h
Qualified
Water pump 1
6.2
15
0
No
Water pump 2
9
21
15
Yes
