Rice husk and thermal comfort: Design and evaluation of indoor modular green walls
|نوع نگارش مقاله||
scopus – master journals – JCR
۴٫۲۷۶ در سال ۲۰۲۰
۲۶ در سال ۲۰۲۱
۰٫۹۰۱ در سال ۲۰۲۰
|شاخص Quartile (چارک)||
Q1 در سال ۲۰۲۰
خرید محصول توسط کلیه کارت های شتاب امکان پذیر است و بلافاصله پس از خرید، لینک دانلود محصول در اختیار شما قرار خواهد گرفت و هر گونه فروش در سایت های دیگر قابل پیگیری خواهد بود.
فهرست مطالب مقاله:
Green walls are vertical greening structures where varied plant species grow. They are conceived as a form of urban landscape and have numerous environmental, social and economic beneﬁts. In fact, these structures have positive effects on air quality, thermal and acoustic insulation, microclimate, psychophysical well-being and urban design. In the framework of thermal comfort, several studies demonstrated the potential of green walls to improve indoor thermal comfort and reduce heat ﬂows through the wall of buildings.
This research evaluates the thermal efﬁciency of two modular green walls that present an alternative substrate as growing medium. This substrate is composed of loam soil and rice husk, an agricultural organic waste derived from the rice milling process. The choice of rice husk is inspired by principles of circular economy in order to reduce the environmental impact and costs of the substrate used in greening applications. The alternative sub- strate was compared with expanded clay aggregate, used for plant cultivation in living walls, and the analysis was divided into two phases. Firstly, ﬁeld experiments were carried out on three plant species (Chlorophytum, Dief- fenbachia and Spathiphyllum) to evaluate the efﬁcacy of these substrates to grow plants. The efﬁcacy of the sub- strate was evaluated through the measurement of the concentration of chlorophyll, the determination of the growth index of plants and a qualitative observation of the root development. Secondly, two modular green walls with varied substrates and plants were designed and tested from the point of view of the thermal comfort, using the open source software TerMus-G. After the transmittance value was obtained as output for each green wall module, the heat ﬂow and the relative variation were calculated and compared to the indoor supporting walls. This article presents a valid methodology approach to evaluate the efﬁciency of green walls substrate and its thermal performance. This methodology differs from those found in scientiﬁc literature and represents a valid
The present research demonstrates the ability of designed modules and, more generally, of indoor green walls to increase thermal insulation without causing condensation. Furthermore, the investigation shows a positive contribution both in winter and in summer. Finally, the use of this undervalue by-product rice husk mixed with loam soil shows to be appropriate for green wall application, providing better performance than the expanded clay in terms of thermal comfort and plant growth rate. Moreover, its use as substrates should further improve the
ecological footprint of green vertical structures and reduce costs.
|بخشی از متن مقاله:|
Green walls are vertical systems on which a selection of plant species are grown and they can be generally divided into green façades and living walls (Manso and Castro-Gomes, ۲۰۱۵). Green façades are usually built with limited selection of climbing plants growing directly against the wall or indirectly on a support system (Vox et al., 2018). Instead, living walls are generally more complex and present a supporting structure on which the growing medium is placed (Gunawardena and Steemers,
2019a, 2019b). These structures are divided into modular or continuous and allow a more uniform vegetation growth (Perini et al., 2013), but may require frequent irrigation and supply of nutrients.
In recent years, green spaces have decreased in urbanized areas due to the excessive exploitation of the land and the exponential increase of concrete structures (Liberalesso et al., ۲۰۲۰). However, this trend is currently reversing due to the implementation of sustainable develop- ment policies (Liberalesso et al., 2020). In this context, green walls are assuming a dominant role in the design, construction and
buildings or districts, contributing to the sustainability of urban and suburban areas (Francis and Lorimer, 2011; Liberalesso et al., 2020).
Conceived as a form of urban landscape, green walls improve its aesthetic value. They also provided multiple associated environmental, social and economic beneﬁts (Manso et al., 2021). Some of these beneﬁts are improving air quality (Pettit et al., 2019), increasing urban biodi- versity (Madre et al., 2015), absorbing noise (Gunawardena and Steem- ers, ۲۰۱۹a), inﬂuencing the urban microclimate (Xing et al., ۲۰۱۹), improving psychological well-being and social relationship (McCullough et al., 2018).
In the framework of thermal comfort, several studies demonstrated the potential of green walls to improve building energy efﬁciency (Manso et al., 2021; Mazzeo and Kontoleon, ۲۰۲۰). Green walls and, in partic- ular, plant coverage improve indoor thermal comfort in summer and winter, and reduce heat ﬂows through the wall of buildings (Yoshimi and Altan, 2011). This reduction corresponds to a lower annual energy con- sumption for heating and cooling (Yoshimi and Altan, 2011). This effect depends on a number of factors such as the climatic zone and season (Perez et al., 2014), the orientation of the wall (Mazzeo and Kontoleon,
2020), the type of substrate (Hunter et al., 2014), the plant species used (Libessart and Kenai, 2018) and the percentage of wall covered by plant materials (Widiastuti et al., 2020).
This study evaluates the thermal efﬁciency of two modular green walls that present an alternative substrate as growing medium. Rice husk, an agricultural organic waste derived from the rice milling process, was selected to be tested as alternative cultivation substrate. The choice of this material is inspired by principles of circular economy in order to reduce the environmental impact and costs of the substrate used in greening applications. Rice husk can be reused in numerous ﬁelds due to its multifaceted characteristics (Bodie et al., ۲۰۱۹). In the context of green walls, this agricultural organic waste has already shown to be appropriate for growing plants if associated with coconut ﬁbre (Rivas-Sanchez et al., 2019; Rivas Sanchez et al., 2018) or perlite, river sand and peat (Dede et al., 2019).
Section ۲ illustrates the different stages and tools adopted in the research, while Section 3 describes the results obtained testing rice husk as an alternative substrate from the point of view of plant health and thermal efﬁciency. Finally, a Conclusions Section underlines the advan- tages of green walls using rice husk and suggests some future research perspectives.
لطفا پیش از ارسال نظر، خلاصه قوانین زیر را مطالعه کنید: فارسی بنویسید و از کیبورد فارسی استفاده کنید. بهتر است از فضای خالی (Space) بیشازحدِ معمول، شکلک یا ایموجی استفاده نکنید و از کشیدن حروف یا کلمات با صفحهکلید بپرهیزید. نظرات خود را براساس تجربه و استفادهی عملی و با دقت به نکات فنی ارسال کنید؛ بدون تعصب به محصول خاص، مزایا و معایب را بازگو کنید و بهتر است از ارسال نظرات چندکلمهای خودداری کنید.