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(‘Green’) Roofs
Published in Simos Yannas, Evyatar Erell, Jose Luis Molina, Roof Cooling Techniques a Design Handbook, 2013
Simos Yannas, Evyatar Erell, Jose Luis Molina
A simulation of the relative benefits of a plant layer on roofs with varying amounts of thermal insulation (Niachou et al. 2001) showed that in a climate such as that of Athens, Greece, substantial energy savings may be made only if the roof has little or no insulation to begin with. For a well-insulated roof (U-value of 0.4 W/m2K or lower), seasonal energy savings from adding a roof garden were only 2%, whether or not night ventilation was employed as an additional cooling strategy.
Integrative technology hubs for urban food-energy-water nexuses and cost-benefit-risk tradeoffs (I): Global trend and technology metrics
Published in Critical Reviews in Environmental Science and Technology, 2021
Ni-Bin Chang, Uzzal Hossain, Andrea Valencia, Jiangxiao Qiu, Qipeng P. Zheng, Lixing Gu, Mengnan Chen, Jia-Wei Lu, Ana Pires, Chelsea Kaandorp, Edo Abraham, Marie-Claire ten Veldhuis, Nick van de Giesen, Bruno Molle, Severine Tomas, Nassim Ait-Mouheb, Deborah Dotta, Rémi Declercq, Martin Perrin, Léon Conradi, Geoffrey Molle
Rooftop agriculture (UA14-RA). A roof garden is a farming system on the roof of a structure or building. In addition to esthetic benefits, roof agriculture is potentially capable of providing food, hydrological benefits, energy saving, temperature control, habitat conservation for wildlife, etc. It may even have ecological benefits when adopted in a large-scale application. Rooftop farming is usually combined with greenroof, hydroponics, aeroponics, air-dynaponics systems, or container gardens. Case studies in Bologna (Italy) showed that this technology can potentially produce vegetables to satisfy 77% of the inhabitants’ requirements during specific times of the year (Orsini et al., 2014). Descriptions of other growing-type technologies for urban agriculture in evolving FEW nexus systems such as community garden (UA15-CG), vertical farming (Sky farming) (UA16-VF), peri-urban farm (UA17-PF), industry greenhouse (UA18-IG) and indoor farming (UA19-IF) are given in Supplementary Information (S1.3).