Topic
Natural circulation
About: Natural circulation is a research topic. Over the lifetime, 3038 publications have been published within this topic receiving 23052 citations.
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TL;DR: In this paper, two forms of ventilation are discussed: mixing ventilation and displacement ventilation, where the interior is at an approximately uniform temperature and there is strong internal stratification, respectively, and the effects of wind on them are examined.
Abstract: Natural ventilation of buildings is the flow generated by temperature differences and by the wind. The governing feature of this flow is the exchange between an interior space and the external ambient. Although the wind may often appear to be the dominant driving mechanism, in many circumstances temperature variations play a controlling feature on the ventilation since the directional buoyancy force has a large influence on the flow patterns within the space and on the nature of the exchange with the outside. Two forms of ventilation are discussed: mixing ventilation, in which the interior is at an approximately uniform temperature, and displacement ventilation, where there is strong internal stratification. The dynamics of these buoyancy-driven flows are considered, and the effects of wind on them are examined. The aim behind this work is to give designers rules and intuition on how air moves within a building; the research reveals a fascinating branch of fluid mechanics.
576 citations
TL;DR: In this paper, a suspended thin flat metallic sheet at the middle or fins at the back wall of an air duct was used as heat transfer augmentations in an air-cooled photovoltaic/thermal (PV/T) solar collector to improve its overall performance.
402 citations
TL;DR: A survey on the theoretical and experimental work on single-phase natural circulation loops (thermosyphons) can be found in this article, which includes available modeling methods (analytical and numerical) to describe steady-state flows, transients and stability characteristics of the various loops.
253 citations
TL;DR: In this paper, scaling criteria for a natural circulation loop under single phase and two-phase flow conditions have been derived for a LOFT facility under one-dimensional area average forms, and preliminary conclusions on the feasibility of the facility have been obtained.
174 citations
174 citations