Dear Oswell,    I agree ...

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Dear Oswell,   

I agree with Mark that you need to provide a little more information for us to really help you.  It is important to understand what types of metals are used in the piping and heat exchangers. 

You describe this as a closed loop system and yet you are losing and replacing over 1 m3 per day.  I noted while reviewing your makeup water spreadsheet that there is a drop in pH on many days that correlates with a drop in system pH. My guess is that is when the system makes up for the lost volume using the RO permeate.  RO permeate is very low in ions and as a result is slightly corrosive to metal piping in its own right.   You should identify where the system volume loss is and fix it so you don't have to continually make up with RO.  

Good luck.