In May's "Secondary Loop Chilled Water in Super High-Rise" by Zhenjun Ma, Shegwei Wang, Ph.D., C.Eng., and Waikeung Pau, I understand the need to sectionalize the chilled water due to the height of the building. But I was taught that in a closed loop system, head height is ignored because the pressure down in the loop cancels the pressure up. Apparently, there is a point in high-rises where this no longer is true. As the head on a 1,608 ft high building is more than 800 psi, at what point does the head pressure become a design consideration?
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