Daikin EUWL KZW1 Series, Service Manual

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Pre-Test Run Checks ESIE-0303
4–6 Part 4 – Commissioning and Test Run
3
1
4
5
The water pressure should not exceed the maximum working pressure of 10 bar.
Calculation of the
minimum water
volume 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:
EUWL24KZW1 311 l 89 l/min 358 l/min __ __
Evaporator Condenser
Chiller type
Minimum water
volume Minimum water
flow Maximum water
flow Minimum water
flow Maximum water
flow
Notation Dimension Description Default
V [m³] Required system volume —
Q [W] Cooling capacity at the lowest capacity
step of each chiller in the system —
t [s] Minimum cycling time allowed by the com-
pressor 600 s
ρ
[kg/m³] Specific mass of the fluid
ρ
water
= 1000 kg/m³
d [K] Thermostat step difference d
outlet water control
= 0.2 K
d
inlet water control
= 0.5 K
C
w
[J/kgK] Specific heat capacity of the fluid C
w, water
= 4186 J/kgK
0,5 x Q x t
V = [m³]
2 x
ρ
x d x C
w