TREATMENTS AND FLUIDS


and easy to maintain cooling system that will only constitute a small part of the energy consumption of the total data centre.


It is clear that operational costs will exceed the initial investments by far on the long term. Yet a big part of the of the operational costs are fixed by choices made in the initial investment process. The choices made the design phase of data centre cooling equipment, will not only affect the initial efficiency and power consumption but it may have a major impact on these parameters in the future. A good example of this is the choice of the type and material of the heat exchangers that are used in most installations. In the process industry or power plants heat exchangers are considered key elements for optimal process efficiency.


Loss of heat transfer in these elements


affects the efficiency of the whole installation and is therefore carefully monitored and corrected if necessary. In data centre design and operation the focus on these heat exchangers seems to be less than other industries.


To understand how corrosion and pollution in HX can have such an impact on cooling


installations efficiency we can look at the basics of the cooling process. In all cooling installations the refrigeration cycle uses the evaporation of a liquid to absorb heat. The absorbed heat is


then released at a higher pressure/temperature to the environment. The cycle of evaporation, compression, c ondensing and expansion is shown simply in Figure 1. The white lines show the


normal cycle where the system works in optimal condition. The red lines show the cycle


when the condensing temperature raises. This can be due to higher outside temperatures or due to a less efficient heat exchanger.


The higher condensing temperature results in a extra power input while the effective cooling capacity is reduced. Because an increased condensing temperature has this double effect, the efficiency of the cooling equipment is reduced significantly.


For an acceptable en ergy consumption of


the cooling installation it is essential to keep the condensing temperature as low as possible. This is the point where a close look at the heat exchangers in the system becomes vital. These heat exchangers must be kept clean and free of corrosion. The right choices in the design phase determine the performance in the long term.


Heat exchangers are designed to exchange heat between media without direct contact


Figure 2: galvanic corrosion in a copper-aluminium heat exchanger.


Anti-Corrosion Coatings for Fin Coil Heat Exchangers


• Doubles the life of your coils • Reduces your Energy Bills


• Reduces the wear & tear on your units • Reduces Maintenance Costs • Reduces Call Outs


Blygold • Reduces the need for early replacement


Blygold UK Ltd have two Coating Centres which cover the UK. For further information please contact us direct. Blygold UK Ltd, Unit 1A, Corinium Industrial Estate, Raans Road, Amersham, Buckinghamshire HP6 6YJ E. UnitedKingdom@blygold.com W. www.blygold.com


T. 01895 259346 F. 01895 259356


Blygold Northern Ltd, Units 2/3 Dinting Ind. Est, Dinting Lane, Glossop, Derbyshire SK13 7NU T. 01457 859111 F. 01457 850715


E. UnitedKingdom@blygold.com W . www .blygold.com 51


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