Ambient air is pulled into the cabinet via the active equipment fans. The hot exhaust air produced by the active equipment then passes over a heat exchanger matrix either by its own velocity or pulled through via EC centrifugal fans mounted within the door; heat is then transferred and rejected to coolant. The resulting chilled air then passes back into the room at the predetermined room ambient temperature.
CL20 rear of cabinet cooler is available in both passive and active models, with the passive version relying solely upon the active equipment fans producing enough air volume to in effect 'self cool'. CL20 rear of cabinet coolers have a number of applications and fit out scenarios such as being sited within an existing data centre, working in harmony with the incumbent computer room air-conditioning, providing high density cooling, a reduction in energy consumption and the removal of hot spot problems.
To achieve this the Rear Coolers can either be retrofitted to existing 'OEM' cabinets using an interface frame or fitted directly to a ColdLogik compliant USpace 4210 cabinet. However to gain the optimum energy performance from a ColdLogik solution the CL20 rear of cabinet cooler should be deployed as a single source solution i.e. the Rear Coolers should be used to control the entire computer room/data centre without the need of any additional air-conditioning products, including retrofit scenarios.
Overview and principle of CL20 system
ColdLogik Management System ‘CMS’
The key element in controlling the room environment is the ColdLogik Management System (CMS). Each rear cooler is intelligently managed for optimum efficiency by embedded computers which continually adjust the operational parameters in response to the heat removal demands placed on the system. By making continual load adjustments, the CMS controllers also maintain the room ambient temperature.
ColdLogik Room Management System – ‘RMS’
The Room Management System (RMS) monitors and manages devices and plant on the ColdLogik network by best optimisation, ensuring the room environment is maintained in the most energy efficient way. RMS can be viewed remotely and locally and provide full access and control
Leak Prevention System – LPS
Another unique and important attribute of the ColdLogik solution is the option of a patented Leak Prevention System (LPS), which is incorporated within the Cooling Distribution Unit 'CDU'. As water is present in most data centres, they have the same inherent weaknesses – such as leak detection systems shutting down parts of the cooling system when moisture is detected. In the event of a pipework breach, the LPS – Leak Prevention System – stops water escaping from the pipework and allows the cooling system to continue running unimpaired, providing uptime, safety and system resilience
External cooling options
External cooling selection is less restrictive with a ColdLogik system – in many cases you do not have to rely on traditional mechanical cooling products such as chillers. This is primarily due to the design and control functions of the CL20 rear coolers – the rear coolers utilise much higher water supply temperatures compared to other forms of computer room air-conditioning to achieve the same room ambient temperature. Consequentially, free cooling can be obtained from a wider range of options – as outlined in our illustration. When all the facts are taken into account, our bold claim of 98% energy savings over and above standard computer room aircon systems is easily justified.