Replacing the cooling water to chilled water

Hi everybody,

In petroleum refinery in addition to implementing pinch in certain potential area & in addition to usage of air coolers,there are cooling water exchangers installed in the process units like in CDU,P-XYLENE Aromatics complex,FCC,Coker etc. Is there any potential area where we can think to replace with chilled water for energy saving/optimization purpose , any sharing of case studies will be highly appreciated ?

Thanks in advance to all of you