AIREDALE LogiCool LCC20 - Minimum System Water Volume Calculations

Chillers
LOGICOOL™
Chillers
13
Technical Manual : 6521355 V1.14.0 11/2016
Design Features & Information
MINIMUM SYSTEM WATER VOLUME CALCULATIONS
(DX Mechanical Cooling Mode Requirements)
General
System fluid 20% ethylene glycol / 80% water.
METHOD 1
Where the system permanent heat load is known and the preferred method:
Vm (l) =
Water Flow Rate
(l/min)
x
Minimum
Compressor Run
Time (min)
x
Chiller Loading
Factor
(1)
Vm (l) =
Output x 60
x 2 x
MT x Output
x 1.2
SHC x ΔT
PHL
(1)
0.1 - 1.00
Where:
Output = (kW) Cooling Duty, Output kW, refer to Performance Data, on page 19
SHC = (kJ/kg°C) Specific Heat Capacity, 3.9 based on 20% ethylene glycol concentration.
ΔT = (°C) Difference of Entering Water and Leaving Water temperature
MT = Minimum Turndown
PHL = (kW) Customer Permanent Heat Load
Example
Model Ref. = LCC40
Ambient: = 35°C
Fluid = 20% Ethylene Glycol
Inlet Fluid Temp. = 7°C
Outlet Fluid Temp. = 12°C (5°C  T)
Customer Permanent Head Load = 20.0 kW
Output at given conditions = 33.7 kW
Vm =
33.7 x 60
x 2 x
0.10 x 33.7
x 1.2
3.9 x 5
20
Vm =
41.9 L
METHOD 2
Where the system permanent heat load is unknown:
Vm (l) =
Water Flow Rate
(l/hour)
x
Minimum Turndown Ratio
x 1.2
Maximum Number of Compressor Starts (per Hour)
Vm (l) =
Output x 60
x
x 0.1
x 1.2
SHC x ΔT
10
Example
Model Ref. = LCC40
Ambient: = 35°C
Fluid = 20% Ethylene Glycol
Inlet Fluid Temp. = 7°C
Outlet Fluid Temp. = 12°C (5°C  T)
Output at given conditions = 33.7 kW
Vm =
33.7 x 3600
x
0.1
x 1.2
3.9 x 5
10
Vm =
74.7 L