Airedale DeltaChill FreeCool 110kW - 1080kW Manuel d'utilisateur télécharger pdf (Page 22)

DELTACHILL™

Chillers

Technical Manual : 7022932_V1.9_11/2013

Design Features & Information

Specific Heat Capacity (SHC)

% Ethylene Glycol Concentration

10%

20%

30%

40%

Specific Heat Capacity (kJ/kgK)

(1)

4.190

4.115

3.901

3.686

3.474

% Propylene Glycol Concentration

10%

20%

30%

40%

Specific Heat Capacity (kJ/kgK)

(1)

4.190

4.139

4.033

3.903

3.749

(1)

Data quoted for water/glycol solutions at a nominal temperature of 10°C.

CAUTION

Only use the SHC data when calculating fluid VOLUME. Use figure for 0% concentration

(100% water) when applying Glycol Correction Factors, refer to Glycol Data, on page 24.

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:

min

Water Flow Rate (litres/minute) x Minimum Compressor Run

Time (mins) x Chiller Loading Factor

Where

min

is the minimum water volume in litres

Minimum Compressor Run Time is 2 minutes

Chiller Loading Factor =

Minimum Turndown (kW) x 1.2

Permanent Heat Load

Example:

Chiller at 35°C Ambient, 7/12°C Water, Model DCC033DR-08BMM0 with a

permanent load of 129.6kW

Unit capacity at design conditions

326 kW

Permanent Heat Load

129.6kW

Minimum Turndown

27%

min =

326 x 60

x 2 x

(326 x 0.27)

x 1.2 = 1522 Litres

4.19 x 5

129.6

METHOD 2

Where the system permanent heat load is unknown:

min

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 DCC033DR-08BMM0

Unit capacity at design conditions

326 kW

Minimum Turndown

27% (0.27)

min =

326 x 3600

x 0.27 x 1.2

= 1512.5 Litres

4.19 x 5

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 161 162

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Airedale DeltaChill FreeCool 110kW - 1080kW Manuel d'utilisateur Page 22

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