Mitsubishi Electric PUHZ-W50VHA Technical Manual page 14

• The water velocity in pipes should be kept within certain limits of material to avoid erosion,corrosion and excessive
noise generation.
Be aware, and take care of , that local velocities in small pipes, bends and similar obstructions can exceed the values
of previous page.
e.g.) Copper : 1.5m/s
Warning
• Use clean enough water which meets water quality standards. The deterioration of water quality may result in the sys-
tem breakdown or the water leakage.
• Never use anything other than water as a medium. It may cause a fi re or an explosion.
• Do not use heated or cooled water that is produced by the air to water heat pump directly for drinking or cooking.
There is a risk to damage your health. There is also a risk that installing the water heat exchanger may corrode if the
necessary water quality for air to water heat pump system cannot be maintained. If you wish to use the heated or
cooled water from the heated pump for these purposes, take measure such as to the second heat exchanger within
the water piping system.
Reference data
Required specifi cation and performance of Plate Heat Exchanger.
Required specifi cation
Refrigerant side
Water side
Burst pressure
Frozen performance
Heat cycle
Endurance pressure
Required performance
< For 2.5~3 HP >
Required performance of Plate Heat Exchanger
Inlet temperature
Condensing temperature
Refrigerant side
(R410A) Subcool
Max. pressure loss
Inlet temperature
Outlet temperature
Water side
Water fl ow volume
Max. pressure loss
* For heating mode, used at counter fl ow direction between refrigerant fl ow and water one.
< For 4~6 HP >
Required performance of Plate Heat Exchanger
Inlet temperature
Condensing temperature
Refrigerant side
(R410A)
Subcool
Max. pressure loss
Inlet temperature
Outlet temperature
Water side
Water fl ow volume
Max. pressure loss
* For heating mode, used at counter fl ow direction between refrigerant fl ow and water one.
Refrigerant type
Normal (designed) pressure
Operating temperature
Refrigerant type
Normal (designed) pressure
Operating temperature
12.45MPa (4.15MPa ×3) or more
Satisfy an initial performance since 5 times or more of deep freezing.
70,000 times or more...Temperature difference: about 50K
72,000 times or more...Pressure difference: 3.3MPa (0 ↔ 3.3MPa)
degC
degC
degC
degC
degC
L/min
degC
degC
degC
degC
degC
L/min
kW 9.0 9.0
75 100
39.5 63.5
2 2
kPa 50 50
30 55
35 60
25.8 25.8
kPa 50 50
kW 14.0 14.0
75 100
39.5 63.5
2 2
kPa 50 50
30 55
35 60
40.1 40.1
kPa 50 50
14
R410A
4.15MPa
-20~100:
Clean water
1.5MPa
-20~90: (No freezing)
Gas pipe: [12.7mm
Liquid pipe: [9.52mm
Inlet / outlet pipe: [28.6mm
Gas pipe: [15.88mm
Liquid pipe: [9.52mm
Inlet / outlet pipe: over [28.6mm