Daikin EUWL KZW1 Series Service Manual page 118

Pre-Test Run Checks
1
Chiller type
EUWL24KZW1
Calculation of the
minimum water
volume
3
4
5
4–6
Evaporator
Minimum water Minimum water
volume flow
311 l 89 l/min
The water pressure should not exceed the maximum working pressure of 10 bar.
The calculation method below is based on the fact that the water volume in a chiller should be large
enough to prevent the compressor from excessive cycling. Sufficient water volume gives a certain
inertia to the system, so that:
■
Water (or glycol) temperature does not drop too fast when the unit turns ON.
■ Water (or glycol) temperature does not rise too fast when the unit turns OFF.
with:
Notation Dimension
V [m³]
Q [W]
t [s]
ρ
[kg/m³]
d [K]
C [J/kgK]
w
Maximum water
flow
358 l/min
0,5 x Q x t
V = [m³]
ρ
x d x C
2 x
w
Description
Required system volume
Cooling capacity at the lowest capacity
step of each chiller in the system
Minimum cycling time allowed by the com-
pressor
Specific mass of the fluid
Thermostat step difference
Specific heat capacity of the fluid
ESIE-0303
Condenser
Minimum water Maximum water
flow flow
__ __
Default
—
—
600 s
ρ
= 1000 kg/m³
water
d
outlet water control
d
inlet water control
C = 4186 J/kgK
w, water
Part 4 – Commissioning and Test Run
= 0.2 K
= 0.5 K