دانلود رایگان مقاله لاتین اثربخشی عایق حرارتی از سایت الزویر
عنوان فارسی مقاله:
هزینه و اثربخشی عایق حرارتی سیستم های سقف سبز: مطالعه تجربی در هنگ کنگ
عنوان انگلیسی مقاله:
Thermal insulation and cost effectiveness of green-roof systems: An empirical study in Hong Kong
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
In Hong Kong, high pollution and lack of greenery have become serious problems to our built environment and communities [1e5]. Majority of buildings are high-rises and their roof areas are typically very limited. As built environments are commonly very densely concentrated, putting greenery on some intermediate roofs and man-made structures such as podia, sky gardens and covered walkways could significantly enhance the surrounding built environment [6e13]. Although green-roof research is comparatively new, its publication rate has dramatically increased in the last 20 years [14]. Green roofs suffer from water stress during long dry periods. Periodically, irrigation is usually required to maintain the health of green roofs [15]. Net shortwave radiation of the canopy is also one of the key parts for green-roof energy balance [16]. Hydroponic green roofs can also reduce rooftop's temperatures and heat amplitude in subtropical climates such as Taiwan [17]. The implementation of green roofs may also relieve heat-island effect problems [12,13]. However, its economy and environmental protection have not been clearly identified [18e26]. Thirty-three green roofs in southern Ontario were surveyed and samples of planting media were recovered for hydrological analyses [27]. Different vegetation types and covers were also studied and found to be important for roof cooling [28]. Green roofs' temperatures have initially been found to be close to the air temperature and green roofs may also provide thermal insulation, runoff reduction, and carbon uptake, but might require irrigation during dry periods [29]. Despite their rising popularity, studies on green roofs thermal insulation performance are however limited. A study in a Central New York climate found that a green roof dampens the extreme responses often observed on urban roofs. Vegetation and substrate layers may be used as insulation, but they are not recommended in lieu of insulation [30]. Energy balance analysis indicates that evapotranspiration and long-wave radiation dissipate most of heat gain for green roofs, and soil water content has a significant impact on energy balance [31]. It is difficult to find out the intangible benefits, i.e. visual aesthetic improvement, health and therapeutic value and ecological value [32e35].
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کلمات کلیدی:
Cost-Effectiveness of Green Roofs | Journal of Architectural ... ascelibrary.org/doi/abs/10.1061/(ASCE)AE.1943-5568.0000022 by M Blackhurst - 2010 - Cited by 60 - Related articles Life-cycle assessment was used to evaluate the widespread installation of green roofs in a typical urban mixed-use neighborhood. Market prices of materials, ... [PDF]Table 1 iranarze.ir/wp-content/uploads/2016/10/E1233.pdf Oct 1, 2016 - Thermal insulation and cost effectiveness of green-roof systems: An empirical study in Hong Kong. Vivian W.Y. Tam a, b, *. , Jiayuan Wang b ... Cost Effectiveness of Green Roofs (PDF Download Available) https://www.researchgate.net/.../239426950_Cost_Effectiveness_of_Green_Roofs Jan 17, 2017 - Life-cycle assessment was used to evaluate the widespread installation of green roofs in a typical urban mixed-use neighborhood. Market ... Thermal insulation and cost effectiveness of green-roof systems: An ... https://www.researchgate.net/.../308958729_Thermal_insulation_and_cost_effectiveness... Thermal insulation and cost effectiveness of green-roof systems: An empirical study in Hong Kong on ResearchGate, the professional network for scientists. The Cost of Green Roofs vs. Conventional Tar Roofs - WPI https://web.wpi.edu/Images/CMS/UGP/quantay-turney-2-poster_for_AFC.pptx.pdf by D Payne system, gas furnace efficiency, A/C seasonal efficiency ratio (SEER), roof insulation. R-Value ... to have a green roof and where it will become cost effective. [PDF]Green roofs reduce energy demands but watering costs in warm ... ec.europa.eu/environment/integration/research/newsalert/pdf/332na2_en.pdf Jun 13, 2013 - effective. Green roofs reduce energy demands but watering costs in warm ... drainage systems; absorbing carbon dioxide emissions; providing ... Green Roof Centre - Benefits of Green Roofs www.thegreenroofcentre.co.uk/green_roofs/benifits_of_green_roofs Green roofs store rainwater in the plants and substrate and release water back ... on their build-up (Green roofs benefits and cost implications, Livingroofs.org In ... [PDF]Economic comparison of white, green, and black flat roofs in the ... www.epdmroofs.org/.../sproul-et-al_economic-comparison-of-white-green-and-black... by J Sproul - 2014 - Cited by 64 - Related articles White roof installation and end-of-service-life replacement costs. White roofs are a cost-effective alternative to black roofs on flat roof buildings because their ... Searches related to cost effectiveness of green-roof systems green roof cost benefit analysis green roof cost per square foot estimate green roof cost savings green roof cost calculator green roof benefits and cost implications green roof lifespan cost of green roof vs conventional roof green roof advantages and disadvantages
