Dear all,

Our MEP Engineer wants to implement a dual recooling system/the hybrid recooler of the series KAVH. For our building type and the location in Germany with strong temperature fluctuations between summer and winter the system seems to be the most water-saving solution to remove the heat because the technology conserves all the makeup water which usually gets used for controlling microbes, corrosion, and scale in the condenser water system.

In the largest part of the year the recooling system runs like a dry cooler. Only with high outside air temperatures during the summer (switchpoint/startpoint spraying: 26.5 degrees Celsius) the heat exchanger surface will be sprayed. Purest osmosis water will be sprayed on the lamellas and evaporates on the heat exchanger. The evaporization energy cools the lamellas and the fluid in the heat exchanger.

Depending on the load of the device and the condition of the ambient air the spray water amount is continuously automatically optimized by an integrated control system so that the water evaporates almost completely. There is no circulation and no excess water and the usual water treatment with corrosion prevention, hardness stabilization and biocides is no longer necessary.

We do have a really water-saving system, but how can we get full points for this credit?
Strictly speaking the alternative compliance path is not applicable for our case because the system does (seasonal) use latent heat of the evaporative cooling of water in an indirectly way.

Can a special circumstances description and a comparison of the water demand between our system and a comparable cooling tower system with circulation be an accepted way to earn full score?

Or can spraying just recycled nonportable water (rainwater) be an option?

What do you think?
Many thanks in advance for your help.