Airedale LogiCool FreeCool 40kW - Manual (Page 19)

Chillers LOGICOOL
™
Chillers
19
Technical Manual : 6521355 V1.8.0 07/2014
Performance Data
ESEER CALCULATIONS The quoted EER figures ( General Specification , on page 29) 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 whole 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 = 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 0.25.
Temperature 20°C 25°C 30°C 35°C
Capacity Requirement 25% 50% 75% 100%
Percentage of Total Hours 0.25 0.41 0.33 0.03
FSEER CALCULATIONS
(Free Cooling) Whilst the ESEER is useful for providing a true energy efficiency of a unit’s performance
over a year it does not offer any advantages for use of free-cooling which can significantly
reduce the unit’s lifecycle power consumption.
The FSEER calculation method has been developed by Airedale to give a single value
that is a realistic indication of the efficiency of the chiller across the whole range
of operation.
The quoted Airedale FSEER figures ( General Specification , on page 29) are similar to the
ESEER and includes the unit ’s free cooling capacity within the calculation. All calculations
for the FSEER use water with 20% ethylene glycol content. Flow rates are kept constant
for all conditions and are determined by the operation at 7/12°C, 35°C ambient.
Free cooling capacity is included within the units EER when available. DX cooling
capacity is included within the Chillers EER when the Free-cooling available is not
sufficient to satisfy the total cooling demand.
ESEER = A.EER
100%
+ B.EER
75%
+ C.EER
50%
+ D.EER
25%
A, B, C and D are weighting factors 0.05, 0.25, 0.47, 0.23.
Temperature 0°C 10°C 20°C 30°C
Capacity Requirement 0.25 0.5 0.75 1
Percentage of Total Hours 0.23 0.47 0.25 0.05
All performance data is supplied in accordance with BS EN 14511-1:2013