Water Storage Tank Volume Calculating; Calculating Volume Of Expansion Water Tank - Daikin UAL-A Series Engineering Data

Diameter of the
steel tube (mm)
Water flow (m
80 18 - 32
100 32 - 65
125 65 - 115
NOTE: PARAMETERS IN THE PRECEDING TABLE MAY VARY BASED ON THE DESIGN MANUAL. FOR DETAILS, SEE THE "HVAC
DESIGN MANUAL".

Water Storage Tank Volume Calculating

Vmin is referred to the below table:
Setting EWT(°C)
Model
UAL160A5
UAL210A5
NOTES:
1. THE TOTAL WATER VOLUME OF THE ENTIRE HYDRAULIC SYSTEM INCLUDES THE WATER IN MAIN PIPE, WATER TANK AND
TERMINAL EQUIPMENTS, IN WHICH THE 2-WAY VALVE IS OPEN.
2. IF THE WATER VOLUME (V) WHILE THE UNIT IS RUNNING IS LESS THAN VMIN, IT'S RECOMMENDED TO INSTALL A WATER TANK
OF (VMIN-V)L, OR IT WILL CAUSE THE UNIT FREQUENT ON/OFF.
3. THE VMIN IN THE TABLE IS CALCULATED BASED ON NOMINAL COOLING WATER FLOW AND 5°C ANTI-FREEZE. IF THE WATER
FLOW AND ANTI-FREEZE TEMPERATURE CHANGE, RELATED VMIN WILL CHANGE.
4. THE TABLE IS APPLIED FOR THE WATER VOLUME SELECTION OF NORMAL CHILLER, NOT FOR THE CHILLER UNDER LOW
LEAVING WATER TEMPERATURE WITH GLYCOL.

Calculating Volume of Expansion Water Tank

An expansion water tank with a proper volume must be installed to adapt to water volume changes as the
temperature changes and avoid freezing burst and pressure instability at the water pump inlet.
The expansion water tank can also be used to supplement water and discharge air.
Calculating volume of expansion water tank.
Vp=α*Δt*Vs
Vp---- effective volume of the expansion water tank (volume of water between the signal pipe and the overflow pipe). m
α----volume expansion coefficient of water (α =0.0006/°C)
Δt----max. water temperature variation °C
Vs----water volume in the system (total water volume in the system and pipes) m
Model Selection Principles for the Water Circulation Pump
Water flow in the water circulation pump ≥ rated water flow × 1.1
Closed water system
3
/h) kPa/100m
10 - 60
10 - 60
10 - 60
Vmin(L)
14
13
12
11
10
9
14
13
12
11
10
9
Open water system
3
Water flow (m /h)
14 - 22
22 - 45
45 - 82
195
231
282
362
507
846
238
281
344
442
619
1032
28
kPa/100m
--
--
10 - 40
3
3