Acoustics evaluation of vertical greenery systems for building walls

Using natural means to reduce surface transport noise during propagation outdoors

“…The porous substrate of a green roof is expected to exert the main effect. Green-wall systems, usually consisting of highly porous and lowweight materials placed in a confinement system, make useful sound absorbers [15,157]. In contrast, common building skins are rigid or close to being rigid.…”

The impact of greening systems on building energy performance: A literature review

“…Small temperature differences were obtained for indirect (20 cm air cavity) and direct (attached) green walls. Living wall systems with planter boxes, compared to other greenery systems, had a higher temperature difference of around 5 K. Among nine different green wall systems in Wong et al's study, LWS with modular panels contribute more effectively on surface wall temperature reduction [35]. This is likely caused by higher shading effect by planter boxes beside higher evapotranspiration duo to constant irrigation in living wall systems.…”

“…Wong et al [35] conducted a field work to observe the influence of different vertical greening systems on ambient air temperature. The best cooling effect was measured in the vicinity of living wall system with a reduction of 3.3 °C and 1.6 °C respectively at the distance of 15 and 30 cm from the green wall.…”

“…Wong et al [35] conducted a field work to observe the influence of different vertical greening systems on the surface temperature of nine free standing concrete walls in an open environment in Singapore. The substrate thickness and the foliage height were different in each vertical system.…”

An application of normal mode decomposition to measure the acoustical properties of low growing plants in a broad frequency range

“…The standard procedure for the determination of the absorption coefficient of materials is detailed in the ISO 10534-2 [1]. Porous media are a mostly well understood class of acoustic materials and the relations between 5 the porous microstructure and its acoustical properties are generally well known [2]. However, the acoustical properties of living plants are poorly understood.…”