Operating limits, Eseer calculations, Glycol data – Airedale DeltaChill FreeCool 110kW - 1080kW User Manual
Page 24: Deltachill ™ chillers
DELTACHILL
™
Chillers
24
Chillers
Technical Manual : 7022932_V1.9_11/2013
Operating Limits
(For 100% Water)
Unit with Electronic Fan Speed HP Control (-20°C)
Minimum Ambient Air DB °C
-20°C
Maximum Ambient Air DB °C
Refer to
Performance Data
– Capacity Data
Minimum Leaving Water Temperature °C
+5°C and+6°C (DCC and DCF respectively)
Maximum Return Water Temperature °C
+18°C and+20°C (DCC and DCF respectively)
1
Temperatures lower than those stated can be obtained with the addition of glycol.
2
For conditions outside those quoted, please refer to Airedale.
ESEER Calculations
The quoted EER figures cover the performance of the unit ONLY at the standard rating
conditions of 7/12°C water, 35°C ambient. The ESEER calculation method has been
developed by Eurovent to give a single value that is a realistic indication of the efficiency
of the Chiller across the year round range of operation.
The ESEER value is calculated from the unit’s performance at 20, 25, 30 and 35°C
ambient temperatures for all loading stages, and with a fixed 7°C supply temperature. All
calculations assume the system operates with 100% water.
ESEER = 0.03.EER
100%
+ 0.33.EER
75%
+ 0.41.EER
50%
+ 0.23.EER
25%
Where 0.03, 0.33, 0.41 and 0.23 are specified weighting factors for use on calculating
ESEER.
Temperature
35°C
30°C
25°C
20°C
Capacity Requirement
100%
75%
50%
25%
Percentage of Total Hours
0.03
0.33
0.41
0.23
Glycol Data
Glycol is recommended when a supply water temperature of +5°C or below is required or
when static water can be exposed to freezing temperatures.
For a given percentage of glycol in the system there are correction factors that need to
be applied, the following tables can be used as a guide.
Ethylene Glycol Nominal Correction Factors
Glycol in System / Freezing Point ºC
10% / -4°C
20% / -9°C
30% / -15°C
40% / -23°C
Cooling Duty
Catalogue Data x by:
0.98
0.97
0.95
0.93
Input Power
0.99
0.98
0.96
0.95
Water Flow
0.99
1.02
1.04
1.07
Pressure Drop
1.05
1.20
1.38
1.57
Propylene Glycol Nominal Correction Factors
Glycol in System / Freezing Point ºC
10% / -2°C
20% / -6°C
30% / -12°C
40% / -20°C
Cooling Duty
Catalogue Data x by:
0.97
0.95
0.91
0.88
Input Power
0.99
0.98
0.96
0.95
Water Flow
0.98
0.97
0.95
0.95
Pressure Drop
1.08
1.17
1.31
1.45
Example
DCC033DR-08BMM0
operating at 7/12, 35°C Ambient, 20% Ethylene Glycol, with AC
condenser fans.
Catalogue
Figure Multiplier
Corrected
Figure
Cooling kW
(refer to
Performance Data
– Capacity Data
)
326
x 0.97
20%
Ethylene
Glycol =
316.2 kW
Input kW
(refer to
Performance Data
– Capacity Data
)
105.6
x 0.98
103.5 kW
Flow l/s
calculated
(DX (Mechanical Cooling kW)
15.56 l/s
x 1.02
15.87 l/s
T x 4.19
Pressure Drop kPa
(refer to
TBA kPa
x 1.20
TBA kPa