TREATMENTS AND FLUIDS
r enewable option; made from a plant based resource, it is a safe, sustainable alternative to MPG
Salts have a number of very advantageous thermo-physical properties, however if there is leakage onto metal components, corrosion can quickly occur.
Specialist low temperature oils or silicones.
Good preparation and maintenance are essential w hen using secondary refrigerants. These fluids can be one of the least expensive components of a system if they are sourced and used correctly. Furthermore, there is plenty of advice readily a vailable in the market, and product data sheets and safety data sheets should also be consulted before use.
Preparation
Always check to make sure that the system is c orrectly sized and that material compatibility e xists with the fluid to be used for all the c omponents, such as pumps, pipework, material and joint seals.
It is important to make sure a system is clean, free of dirt, grime, rust and other particles, and has no stagnant water in it.
Test for leaks before filling and charge slowly to avoid air pockets and purge any entrapped air.
Dilution
S econdary refrigerants come as concentrated or r eady-to-use products.
T he correct dilution for freezing protection is essential and the density and viscosity of that concentration should be taken into account. When these fluids get close to their freezing point, their viscosity increases, making them harder to pump.
C oncentrated product should be diluted with d emineralised or de-ionised water to protect the l ongevity of the system. This is because it will be free of chlorides, sulphates or calcium which can cause sludge or scale to form. It is often simpler to use a ready-to-use product which has already been diluted to the required concentration.
Corrosion protection
Good quality secondary refrigerants will contain corrosion inhibitors, a key feature for the
longevity of any fluid. Check that these products c omply with the ASTM or NFR standards. Some p roducts now also use organic inhibitors and they are longer lasting and give better thermal transfer
Secondary systems can have a big part to play a s we move toward a lower GWP future. Good a ll round system maintenance and the use of high quality fluids will help achieve a sustainable option. Companies such as Climalife can offer advice on product suitability for your applications.
p roperties, as they only form a protective film if t here is a sign of corrosion.
Mineral based inhibitors will otherwise form a protective layer on the wall of the system.
Maintenance
Regularly check the PH levels to ensure there are no signs of corrosion and also check the concentration of the liquid to ensure there are no risks of freezing. Drain or top up the system with a good quality glycol and ensure the correct concentration levels are met. Topping up a system with water can dilute the protection levels and potentially cause costly damage to a system, so do not be tempted to cut corners.
Labelling
E nsure your equipment is correctly labelled with t he product in use. This will facilitate future maintenance.
Petra
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