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Unbalanced Exchange Flow and Its Implications for the Night Cooling of Buildings by Displacement Ventilation by Wise, Nick (author);Hunt, Gary (author) is a nonfiction available to read on EtoBox.

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## Abstract Passive ventilation of buildings at night forms an essential part of a low-energy cooling strategy, enabling excess heat that has accumulated during the day to self-purge and be replaced with cooler night air. Instrumental to the success of a purge are the locations and areas of ventilation openings, and openings positioned at low and at high levels are a common choice as there is then the expectation that a buoyancy-driven displacement flow will establish and persist. Desirable for their efficiency, displacement flows guide excess heat out through high-level openings and cooler air in through low-level openings. Herein we show that displacement flow cannot be maintained for the full duration of a purge. Instead, the flow must transition to an ‘unbalanced exchange flow’, whereby the cool inflow of air at low level is maintained but there is now a warm outflow and a cool inflow occurring simultaneously at the high-level opening. The internal redistribution of heat caused by this exchange alters the rate at which heat is self-purged and the time thought necessary to complete a purge. We develop a theoretical model that captures and predicts these behaviours. Our approach

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Author

Wise, Nick (author);Hunt, Gary (author)

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Category

nonfiction