Abstract
The Thermal Behaviour of a Cylindrical Air Layer Enclosed between Double Fabric Roof Membranes
Highlights
Contemporary tendencies in the shaping of roof surfaces, the needs for natural light, the improvement of structural characteristics of fabric material and numeric procedures for analysis and calculation have led to an increase in the popularity of tensile structures for covering public objects, mostly semi-open objects.The negligibly small thickness of the fabric, ranging from 0.8 mm to 1.6 mm and the exceptional core heat conduction of the fabric membranes 0.19 Wm–1K–1 indicate high losses in the winter, that is, high heat gain in the summer
One of the ways of improving the energy efficiency of these objects is the implementation of a double fabric roof membrane structure with an enclosed non ventilated air layer
In this paper we studied the influence of transparent, lightweight, thin, double fabric material on the thermal resistance of an air layer with a convex wall geometry, which is closed unventilated, 70 cm, thick, since the standards [9] only take into consideration flat horizontal and vertical surfaces at an angle of up to 30°
Summary
Contemporary tendencies in the shaping of roof surfaces, the needs for natural light, the improvement of structural characteristics of fabric material and numeric procedures for analysis and calculation have led to an increase in the popularity of tensile structures for covering public objects, mostly semi-open objects.The negligibly small thickness of the fabric, ranging from 0.8 mm to 1.6 mm and the exceptional core heat conduction of the fabric membranes 0.19 Wm–1K–1 indicate high losses in the winter, that is, high heat gain in the summer. Contemporary tendencies in the shaping of roof surfaces, the needs for natural light, the improvement of structural characteristics of fabric material and numeric procedures for analysis and calculation have led to an increase in the popularity of tensile structures for covering public objects, mostly semi-open objects. The energy influence of the structural fabric is the function of the balance between the decreased need for lighting and increased costs for cooling/heating. The establishment of thermal comfort in closed tensile structures represents a very demanding energy problem, which is especially pronounced in the summer due to increased heat gain due to solar radiation. The prescribed thermal comfort includes an improvement in the thermal-physical properties of the outer fabric layer
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