Natural ventilation can be categorized into single-sided and cross-ventilation. Based on the air flow mechanism of a wind-driven natural ventilation, effective rates in buildings are different from through openings. The mixing coefficient or efficiency is defined by ratio these rates, indicating ventilating ability similar to effect penetration depth fresh air. This paper provides detailed anal...

Explicit algebraic equations for calculation of wind and stack driven ventilation were developed by parametrically matching exact solutions to the flow equations for building envelopes. These separate wind and stack effect flow calculation procedures were incorporated in a simple natural ventilation model, AIM-2, with empirical functions for superposition of wind and stack effect and for estima...

Prediction of single-sided natural ventilation is difficult due to the bi-directional flow at the opening and the complex flow around buildings. A new empirical model was developed that can predict the mean ventilation rate and fluctuating ventilation rate due to the pulsating flow and eddy penetration of single-sided, wind-driven natural ventilation in buildings. The governing equation is base...

Natural ventilation nowadays has been paid great concerns due to its zero carbon emission and good performance on the human health. In engineering applications, cross driven by winds frequently restricted in building clustered cities. Instead, single-sided natural becomes an alternative mode wind strategies for urban buildings. This research reviewed former published researches terms of classif...

Natural ventilation through windows and other openings in the building envelope is still the most common way to ensure the necessary fresh air supply in buildings. To date, there are few validated models for the calculation of ventilation rates through large openings. In particular, there is a lack of information about natural cross-ventilation. On the basis of an empirical study a mathematical...

An idealised, staggered array of 9 6m 3 cubes was built to gain an understanding of the influence of other buildings on the natural ventilation rate of a building. The instrumented cube contained 24 temperature measurements, 32 surface pressure taps, CO2 sensors and 2 sonic anemometers, with 5 more placed outside to measure wind velocities. Ventilation rate was measured when the cube was sealed...

Patterns and rates of air movements in the mounds and nests of Macrotermes michaelseni were studied using tracer methods. Wind is a significant source of energy for powering nest ventilation, despite the mound being a completely enclosed structure. Nests are ventilated by a tidal movement of air driven by temporal variation in wind speed and wind direction. Density gradients sufficiently steep ...