Airedale TurboChill FreeCool 200kW - 1830kW - Manual (Page 38)

38 Chiller Technical Manual 7525355 V1.1.0_03_2013
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Chillers TurboChill™ Air Cooled and FreeCool
Typical Part Load Efficiencies
The following graph gives a general indication of the effect of reduced load on the performance of the unit, for
performance details, please contact 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 (European Seasonal Energy Efficiency Ratio) 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 25, 50,
75 and 100% loading stages respectively, and with a fixed 7°C supply temperature. All calculations assume the system
operates with 100% water.
ESEER = A●EER
100%
+ B●EER
75%
+ C●EER
50%
+ D●EER
25%
A, B, C and D are weighting factors 0.03, 0.33, 0.41 and 0.23.
A B C D
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
%
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f F
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l L
oa
d
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In
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250%
1
2
3
200%
150%
100%
50%
0% 25%
@ 20°C
Ambient
50%
@ 25°C
Ambient
75%
@ 30°C
Ambient
100%
@ 35°C
Ambient
% of Full Load Capacity
Key: 1 = EER
2 = Output kW
3 = Input kW
SEER
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 SEER calculation method is used for part of the Building Regulations Part “L” to give a single value that
realisticly indicates the efficiency of the chiller across the year round range of operation.
The SEER 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.
SEER = A●EER
100%
+ B●EER
75%
+ C●EER
50%
+ D●EER
25%
Where A,B,C and D are specific weighting factors 0.12, 0.32, 0.36 and 0.2 for use on calculating SEER.
A B C D
Temperature 35°C 30°C 25°C 20°C
Capacity Requirement 100% 75% 50% 25%
Percentage of Total Hours 0.12 0.32 0.36 0.2