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Case Studies > Office and Electrical Equipment Cooling 
Overview 
The building air conditioning system related to this project requires a chilled water supply at 7ºC out and 12ºC return. This water is used to extract heat from air handling coils fitted within the office complex. 
 
Due to a poor electrical supply, there is insufficient power available at the same time during 8.00 – 6.00pm (a working day) to supply all the office electrical equipment and an on line total office cooling system. 
 
To overcome this problem a 20 Tn thermal storage system has been installed. This system accumulates ice from 8.00pm for a twelve hour period to the following morning. 
 
All the heat extracted from the building is discharged by means of a large closed circuit multi fan Air Blast Dry Cooler mounted on the building roof. 
 
Equipment cooled by this unit is:- 
a. Two water cooled chillers 
b. The building circulating water at times when the outside ambient is sufficiently low.  
 
The Air Blast Dry Cooler circulating fluid is a 25% ethylene glycol solution. 
The fluid linking the glycol to the Flexible Office cooling means is clean water. 
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Below: One of the circulating pump skids 
Above: The ice bank tank layout 
Above: Ice bank coil  
System Components 
Dry Cooler Pump Set  
The dry cooler pump set has been designed to supply chilled water at 37ºC from the Air Blast to the Chillers and return water at 42ºC from the chillers to Air Blast. 
Main Glycol  
Pump Set 
The Main Glycol Pump Set consists of the storage tank containing water for the chillers and the heat exchanger which cools the secondary water, i.e. the main load. 
Water at -2ºC is pumped from the tank to the chillers which further chill the solution to -6ºC. This solution can feed either or both of the Ice Banks if required. Water can then be either returned to the storage tank or passed through the heat exchanger as required where it would return to the storage tank. 
ZA Pump Set  
The ZA Pump Set has been designed to supply chilled water at 7ºC from the Heat Exchanger to the Customer Load, returning at 12ºC. 
Ice Bank Cooler IB10 
The Ice Bank Coolers IB10 have been designed to store 1800kWhr cooling capacity over a charge time of 11 hours. 
Air Blast Dry Cooler 
The Air Blast Dry Cooler was selected to supply 250kW cooling capacity with a flow temperature of 37ºC, returning at 42ºC in an ambient of 30ºC. 
Chiller – CWC Enersave 2230ZC 
The Chillers were selected to supply 90kW cooling capacity with a flow temperature of -6ºC, returning at -2ºC. 
Free Cooling System 
During periods when the ambient temperature is low enough to provide free cooling, the Air Blast Dry Cooler will be able to cool or help cool the circulating glycol without the use of the ice bank system. 
HMI Control System 
The system is normally operated from the HMI on the front of the control panel 
Remote Access 
The customer has linked the TES system to their own remote computer system which can switch on/off various components and also tracks the amount of ice available.