(Preferred Method) Where the system permanent heat load is known, the minimum water volume in litres Vmin is:
Vmin = Water Flow Rate (litres/minute) x Minimum Compressor Run Time (mins) x Chiller Loading Factor
Where
Vmin is the minimum water volume in litres
Minimum Compressor Run Time is 2 minutes
Minimum System Water Volume Calculations
Example: Chiller at 35°C Ambient, 7/12°C Water, Model DCF046DR-07DXY0 with a permanent load of 191.2 kW
Unit capacity at design conditions = 478 kW
Permanent Heat Load = 191.2kW
Minimum Turndown = 16%
Where the system permanent heat load is unknown:
Vmin = Water Flow Rate (litres/hour) x Minimum turndown ratio x 1.2
Maximum number of compressor starts (per hour)
Example: Chiller at 35°C Ambient, 7/12°C Water, Model DCC046DR-07DXY0
Unit capacity at design conditions = 478 kW
Minimum Turndown = 16% (0.16)
METHOD 2
METHOD 1
= Vmin = 478 x 60 x 2 x (478 x 0.16) x 1.2 = 1314.2 Litres
4.19 x 5 191.2
Vmin = 478 x 3600 x 0.16 x 1.2 = 1314.2 Litres
4.19 x 5
12
Chiller loading factor = Minimum Turndown (kW) x 1.2
Permanent Heat Load
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