Airedale DeltaChill FreeCool 110kW - 1080kW - Manual (Page 9)

Chillers DeltaChill™ Air Cooled and FreeCool
9 Chiller Technical Manual 7267818 V1.4.0_04_2014
Introduction
Nomenclature
Introduction
The DeltaChill Free Cool chiller has been designed to provide the cooling load required whilst optimising energy
efficiency at all times and as such will take advantage of free cooling whenever available. If the free cooling available
cannot satisfy the required full cooling load, direct expansion cooling is used to supplement the output.
Specifiers Guide
Free Cooling Operation
In high ambients where free cooling is not available the fan
speed modulates in the conventional manner to maintain a
constant head pressure. Free cooling is initiated wherever the
outdoor ambient is 2°C less than the return water temperature.
The condensing temperature is constantly monitored and
intelligently kept within the compressor envelope to allow the
fans to run as fast as possible and therefore achieve the most
free-cooling without having a negative impact on compressor
integrity.
Free - cooling vs Mechanical cooling
System operated on 100% Free
Cooling (77% of Year)
System operated on
mechanical cooling only (23%
of Year)
Cooling
Load
Mechanical (Compressor) cooling
Free - Cooling
-7°C
0.5°C
12.5°C
Ambient Temp
DC F xxx D R- 07 x X Y 0
DC DeltaChill
F F = FreeCool Chiller, C = Air Cooled Chiller
xxx Nominal Capacity (kW/10)
Number of Circuits
D Dual Circuit
T Triple Circuit
Noise Variant
R- Regular Quiet
X- Extra Quiet
07 - 22 Number of Fans
C - H Evaporator Type
A - Y
A - Y
A - Y
Example
Document Navigation
The units have a unique number * (apart from the Nomenclature) for you to search each table of data.
For example Number “1” DCF046DR-07DXY0 is referenced in all tables, Performance, Mechanical, Electrical, Noise etc.
*This number is only used within this document. Please contact Airedale with the full nomenclature for product information.
In ambients where the free cooling coil is capable of satisfying the full cooling demand, the condenser fans are
modulated to provide the desired duty. The condenser fans are capable of being modulated between 25-100% of airflow
to maintain the supply water temperature.
During periods where the condenser fan speed has been reduced to a minimum, the supply water temperature will then
be controlled by the 3 way valve.