Every interactive model on this site assumes its own private building. This page gives them one building to share. Change the height and watch the pressure zones, the mechanical floors, the riser shafts, the cooling plant, the water balance and the stack pressure all move together — because in a real tower they do.
Every relation on this page is the one used in the article it links to, with the same constants and the same stated assumptions. Nothing here is a new model — the only new thing is that they are all being fed the same building at the same time. That is also the point: a change to the floor plate is not a façade decision, and a change to the tapware pressure limit is not a plumbing decision.
Where the numbers come from. Stack pressure from stack effect; pressure zoning from domestic water and firefighting; the zone-height table and riser economics from mechanical floors; envelope and diversity from cooling load; static head and heat-exchanger cascade from chilled-water pumps; makeup from cooling towers; machine-room heat from lifts and MEP; delivered water energy from the six-kilowatt litre.
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