Cooling Water for Hybrid System
Location: Various Locations
Capacity: 24-3200 m³/day
Many new installations where a high degree of cooling is required are now fitted with a system that allows the use of water for adiabatic cooling.
Heat rejection is achieved by two principle modes of operation namely:
In hybrid mode cooling water is used to achieve both convective and latent heat rejection. Hybrid condensers have been selected to reduce water consumption, limited the use of water treatment chemicals, remove aerosol/vapour plumes, provide high efficiency operation and give low noise levels in operation.
Although such units may run on air cooling for the majority of the year it is essential that when water is used as part of the cooling cycle that proper precautions are implemented.
If any standing water is present when they are brought into service then they must treated in line with the main recommendations of the HSC Approved Code of Practice and Guidance L8.
Theoretically there should be no standing water in such designs apart from that in the stored water system for start-up as all water sprayed into the system will be evaporated to dryness.
Also, theoretically there should be no aerosols produced that can enter the air stream but in practice this cannot be proven.
In practice some standing water is unavoidable and as such the water needs to be of the correct quality all of the time.
This includes recognising the following:
In order to achieve this, the following needs to be implemented as part of any scheme and Risk Assessment:
Kirton Engineering can provide such water treatment systems that are complaint with both L8 and the upcoming HSG 274 as well as any relevant Health Building notes etc.
Such systems currently in use normally have the following elements: Softener/antiscalant, RO, Stored recirculated UV disinfected RO water, In -line dosing and a suitable bleed system.