TurboChill™
Chillers
31
TurboChill Water Cooled Technical Manual 9216326 V1.10.0 06_2017
Minimum System Water Volume Calculations
METHOD 1
(Preferred Method)
Where the system permanent heat load is known, the minimum water volume in litres
V
min
is:
V
min
=
Water Flow Rate (litres/min) x
Minimum Compressor Run Time (min) x
Chiller Loading Factor (CLF)
METHOD 2
Where the system permanent heat load is unknown:
V
min
=
Water Flow Rate (litres/hour) x Min. Turndown x 1.2
Maximum number of Compressor starts (per Hour)
Example: 750kW output at 30/35°C Condenser and 7/12°C Evaporator
Minimum Turndown =
0.075 (7.5% 4 modules)
750 x 3600
x 0.075 x 1.2
= 1038 Litre
3.9 x 5
12
Vmin =
kW x 3600
x Min turndown x 1.2
= 1038 Litre
CP x Δt
Maximum number of Compressor starts(per hour)
Minimum Turndown
1 Module - 30%
2 Modules - 15%
3 Modules - 10%
4 Modules - 7.5%
Example: 750kW output at 30/35°C Condenser and 7/12°C Evaporator
Permanent Heat Load =
300kW
Minimum Turndown =
7.5% (4 modules)
Vmin =
750 x 60
x 5
x
0.075 x 750 x 1.2
= 2163 Litre
3.9 x 5
300
Where
Vmin is the minimum water volume in llitres
Minimum Compressor Run Time is 2 minutes
Chiller loading factor =
Minimum Turndown x MHL x 1.2
Permanent Heat Load
Te
ch
nic
al
