Choosing the Right Water Chiller Unit for your Application could be a Critical Decision for any customer, so let us at Chillaire Limited assist you.
These days the chiller unit manufacturers offer a variety of chiller units with numerous configurations, choosing the right one for your requirement is the key and very important as it could be a very costly exercise in the long run for end users.
Chillaire Limited have been involved with some large projects in recent years, desigining, selecting and quoting various manufacturers, and types of chiller units. We have noticed that a lot of manufacturers are starting to or have switched to plate type evaporators, which take up less space in the chiller unit leaving more space for buffer tanks and pumps sets (if required). The evaporator is where the process water is cooled during the refrigerant-to-water heat exchanger portion of the chilling cycle.
Brazed Plate Evaporators are used in most Advantage portable liquid chillers and smaller central liquid chillers. Their space efficient shape and high efficiency allows for compact machine design. The non-ferrous construction eliminates rusting and alternating plate design makes the brazed plate evaporator less susceptible to freeze damage when compared with shell and tube evaporators.
Shell & Tube Evaporators are physically larger and heavier than brazed plate evaporators but are more tolerant of fluid contaminants.
Aluminium Tube / Aluminium Fin over Copper Tube / Aluminium Fin – Condensor Coils
Some manufacturers are now switching to aluminium coil / aluminium fin condensor coils, as opposed to the traditional copper tube / aluminium fin condenser coils. The reason being given is that the aluminium copper / aluminium fin condensor coils are more energy efficient and so provide better heat exchange across the condenser coils. They are also lighter in weight. However Chillaire limited have recently in the last year been involved in various incidents on customer sites where these aluminium tube / aluminium fin condensor coils have cracked and have started leaking after only a few years of running time. Unlike the copper tube / aluminium fin condenser coils, these new aluminium tube / aluminium fin condensor coils are very hard to repair, in most cases unrepairable and they have to be replaced, which we had to do for one of our global clients and the chiller units are only 3 years old. If it was a copper tube / aluminium fin condenser coil, we believe the condenser coils would not have started leaking after 3 years. We also believe any small leak would have been repairable without the client having to incur a very expensive cost or having to wait 2 to 3 weeks for new condenser coils to be delivered, in the meantime the chiller has been out of action.
We have also noticed that some manufacturers are designing and selling single refrigerant circuit, two stage chiller units with may be up to 4 x compressors to provide a better capacity control. However the problem with this design is that in some cases the design is so basic, if a single refrigerant leak occurred anywhere on the refrigerant circuit, it could mean that all of the refrigerant could potentially leak out of the chiller unit.
Another problem that a customer could be faced with on a single circuit refrigerant chiller unit with up to 4 x compressors is that, if one of the compressors suffered an electrical burnout, it could potentially contaminate the whole refrigerant circuit in the chiller unit and even the other remaining 3 x compressors on the chiller unit, this could potentially that the entire chiller unit would be affected and mean the chiller unit could no longer be in operation and requiring immediate repairs and also leaving the customer with an enormous repair bill.
Choosing the right chiller unit is very important and that is why we at Chillaire Limited try to ensure that each one of our customer’s specific chiller requirements is handled with this mind and the correct chiller unit with the best configuration and step capacity is selected and installed.