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Natural Pressure Differential – Infiltration Through Wind Results of a Long-Term Measurement

Wind pressure and thermal forces are driving forces for pressure difference on the building envelope. In European and German standards infiltration is calculated using wind speed, temperature difference and wind pressure coefficients result-ing from upstream and downstream flow on the building envelope. This long term measurements shall present measured pressure differences on the building envelope in comparison to those calculations.

The assessment of wind loads. Parts 5,6,7,8

                               

Solar-Wind Generated Roof Ventilation System (SiVATAS) for a Warm-Humid Climate

This research grows out of a desire to find a Solar-Wind Generated Roof Ventilation System for low-cost dwellings located in high building density urban areas where horizontal air movement is restricted. A general purpose computational fluid dynamics (CFD-ACE+) program was utilised to explore, analyse and develop a roof model based on its aerodynamics and thermal performance to obtain optimum wind pressure and temperature differences. Comparisons were made with physical scale models.

Wind tunnel tests of the wind pressure on a detached-house at a large geometric scale

Wind pressure measurements corresponding to the various configurations of a detached houseshould be conducted by wind tunnel tests using a comparatively large geometric scale model because a building of extremely small size is targeted.

Wind-Buoyancy Interaction in Natural Ventilation

There has been considerable interest in the interaction between buoyancy and wind pressure gradients on the overall structure of natural ventilation flows. Indeed, it has been shown that when wind and buoyancy forces act in opposition, it is possible that for certain wind speeds, multiple steady states may emerge, with a stable wind dominated and a stable buoyancy dominated regime being possible for identical conditions; while at lower wind speeds, the buoyancy dominated flow develops and higher wind speeds, the wind dominated flow develops.

Numerical Evaluation of Wind Pressure Distributions of Buildings by Means of a Modified k-e Model

A modified k-e model that restricts turbulent time scale using Durbin’s limiter was applied for numerical prediction of wind pressure distributions of building models. It is known that the standard k-e model tends to overestimate wind pressure of windward

Full-scale wind pressures on a permeable roof of a low-rise building

Measurements were operated during years 2000 and 2001 on a full-scale test house on the site of BBRI (Belgium) in order to determine the pressures due to the wind on the roof. This paper presents the measurements results and the pressure coefficients obtained. Results are compared with the values of pressures on the roof given by the calculation method of Eurocode 1 (EC1).

TRNFLOW: Integration of COMIS into TRNSYS TYPE 56

TRNSYS’ thermal building model, type 56, requires air flows between zones as input values. However, in natural ventilation systems these depend on the wind pressures and the inside and outside temperatures. To account for this situation, a coupling with a

Study on effect of pulsation of high-rise building wind pressure upon indoor thermal comfort.

In accordance with the regular and irregular variation principle of high-rise building wind pressure with the variation of time, wind direction proposed in associated reference and high-rise building around flow aerodynamic characteristic. An analysis is made about the characteristic and range in which wind pressure on high-rise building changes largely with coming flow, time and wind direction in the paper. On this base, this paper points out that building heat load and air infiltration rate is unstable and has large fluctuation in certain period.

Simulation of temperature and air flow in a second skin façade.

The Second Skin Facades can be an useful tool for increasing the efficient use of natural ventilation in order to decrease the energy consumption for ventilation and cooling purposes and to increase the indoor thermal comfort levels. To analyze this type of facades a simulation is set up. The simulation is carried out with the simulation code Simulink.

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