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LOGICOOL™

Chillers

Technical Manual : 6521355 V1.8.0 07/2014

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)

Minimum Compressor

Run Time (min)

Chiller Loading Factor

(1)

Vm (l) =

Output x 60

x 2 x

MC% x Output x 1.2

SHC x ΔT

100 x PHL

(1)

0.1 - 1.00

Where:

Output = (kW) Cooling Duty, Output kW, refer to Performance Data, on page 20

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

MC% = Minimum Capacity expressed as a % of Output, refer to Mechanical Data, on

page 29

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



Customer Permanent Head Load = 20.0 kW

Output at given conditions = 33.7 kW

Vm =

33.7 x 60

x 2 x

20 x 33.7 x 1.2

3.9 x 5

100 x 10

Vm =

41.9 L

METHOD 2

Where the system permanent heat load is unknown:

Vm (l) =

Water Flow Rate

(l/hour)

Minimum Compressor

Run Time (min)

Vm (l) =

Output x 60

SHC x ΔT

Example

Model Ref. = LCC40

Ambient: = 35°C

Fluid = 20% Ethylene Glycol

Inlet Fluid Temp. = 7°C

Outlet Fluid Temp. = 12°C (5°C



Output at given conditions = 33.7 kW

Vm =

33.7 x 60

3.9 x 5

Vm =

207.4 L

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 39 40

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