Pressure equalization of rainscreen walls: a critical review

Pressure-equalized rainscreens: A study in the frequency domain

Thesis( Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering 2008

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Advanced Numerical and Experimental Transient Modelling of Water and Gas Pipeline Flows Incorporating Distributed and Local Effects

Guideline for Condition Assessment of the Building Envelope provides a guideline and methodology for assessing the condition and performance of existing building envelope systems and components, as...

Guideline for Condition Assessment of the Building Envelope

Controlling rain penetration in the building envelope is a continuing task for building engineers and architects. In 1963, Garden introduced the "Open Rainscreen" principle, in which external wind pressure, one of the forces that contributes to rain penetration, is controlled by equalizing it with internal cavity pressure through venting. As pressure equalization is the key element of the process, these walls are known as Pressure Equalized Rainscreen Walls (PER). Application of this wall multiplied rapidly and it is considered the most reliable tool to control rain penetration. Yet few designers seem to have a clear knowledge or rules of designing such walls; thus the problem of rain penetration is not prevented totally.

Review of design guidelines for pressure equalized rainscreen walls

The non-steady characteristics of orifices have been analyzed on the assumption that the free streamline forms an ellipse on the hodogram. The coefficient of contraction is greater than that fro steady flow during the period of acceleration, and smaller during the period of deceleration. In sinusoidal pulsating flow, the mean value tends to be slightly smaller than the steady flow value. The opposite is true for the coefficient of discharge, defined by the instantaneous flow rate and the pressure difference. The experimental results, in which the amplitude of the pulsating flow rate was less than 0.5 and frequency less than 50 Hz, agreed well with the theoretical calculations.

Atsushi Yamaguchi

Papers

Non-Steady Characteristics of Orifices