Data Sheet for Product

13/20
Siemens Modulating refrigerant valves with magnetic actuator, PS45 CE2N4714en
Smart Infrastructure 2021-08-02
In practice, the KE, KH or KS value can be estimated because the theoretical k
vs
-value
ascertained will be rounded off by up to 30% to one of the ten available k
vs
-values,
allowing you to proceed directly at Step 4.
Step 1: For t
c
= 45, calculate the value for t
o
= 0 between values 40 and 60 in the
table; result: 63.75
Step 2: For t
c
= 45, calculate the value for t
o
= 10 between values 40 and 60 in the
table; result: 67
Step 3: For t
0
= 5, calculate the value for t
c
= 45 between correction factors 63.75
and 67; calculated in steps 1 and 2; result: 65.375
Step 4: Calculate the theoretical k
vs
value; result: 1.84 m
3
/h
Step 5: Select the valve; the valve closest to the theoretical k
vs
value is the
MVL661.20-2.5
Step 6: Check that the theoretical k
vs
value is not less than 40 % of the nominal
k
vs
value
KE-R407C
t
0
= –10 °C
t
0
= 0 °C
Interpolation at
t
c
= 45 °C
t
c
= 40 °C
64
67
64 - [(64-63) x (45 - 40) / (60 - 40)]
63.75
t
c
= 45 °C
-
-
t
c
= 60 °C
63
67
67 - [(67 - 67) x (45 - 40) / (60 - 40)] 67
Interpolation at
t
o
= 5 °C
63.75 + [(67 - 63.75) x (5 - 0) / ((10 - 0)]
65.375
k
v
theoretical = 120 kW / 65.375 kW/(m^3/h) = 1,84 m^3/h
Valve MVL661.20-2.5 is suitable, since: 1.84 m^3/h / 2.5 m^3/h x 100% = 74% (>40%)
Note on interpolation