Energy Saving

Energy saving

There are many energy metrics used within different industries – the air conditioning industry uses the energy efficiency ratio (EER) and data centres often refer to PUE (power usage effectiveness).  Another metric used within the air conditioning field is the estimated seasonal energy efficiency ratio (ESEER) which takes into account both part load and seasonal variance and focuses purely on data centre cooling equipment and not other power consuming products in the data centre.

Cooling power consumption vs computer power

The tables give indicative percentage figures of cooling power consumption against computer power at full and partial cooling loads. These are more in line with ESEER calculations and a useful and accurate base for your data centre’s cooling system efficiency when planning a new build.

External ambeint air

Part load

Full load

Max air temp



Min air temp



Average air temp



Examples: dry air coolers, adiabatic coolers, cooling towers



Naturally sourced water Part load Full load
Constant water temperature 1.5% 1.5%

Examples: boreholes, rivers, lakes, sea water

Cooling Systems - Energy Saving


Power usage effectiveness (PUE)

The PUE may vary between 1.04 and 1.5 depending on the geographical location and external cooling solution chosen to pair with ColdLogik CL20 rear of cabinet coolers, site conditions and architecture. Properly designed ColdLogik installations are between 1.04 and 1.1, even on part load.