Toward the practicability of a heat transfer model for green roofs

Chen, Pei Yuan; Li, Yuan Hua; Lo, Wei Hsuan; Tung, Ching-Pin

doi:10.1016/j.ecoleng.2014.09.114

Cited by 20 publications

(3 citation statements)

References 22 publications

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“…A green roof is an effective building energy-saving technology and plays a significant role in regulating temperature and heat flux (Chen et al, 2015). Research has confirmed that after a transformation to a green roof, the demand for building energy is reduced; the annual electricity consumption of the building is reduced; energy consumption is reduced, and indoor comfort is greatly improved.…”

Section: Introductionmentioning

confidence: 99%

Reduction in Carbon Dioxide Emission and Energy Savings Obtained by Using a Green Roof

Cai

Feng

et al. 2019

Aerosol Air Qual. Res.

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Green roofs have good heat preservation and insulation performance, which plays an important role in reducing airconditioning load and reducing carbon dioxide emissions. Experimental research and numerical simulation analysis on the energy-savings and ecological benefits of green roofs in hot summer and cold winter areas in Wuxi, China (31°N, 120°E) are carried out. The experimental results show that a new type of Buddha grass can absorb 1.79 kg of CO 2 and release 1.3 kg of O 2 per square meter per year. In addition, the annual carbon emission reduction of the green roof in Wuxi was 9.35 kg m-2 , and the emission reduction benefit of the green roof was calculated to be USD $1.02 m-2 a-1. The energy consumption simulation shows that the green roof per unit area can save 11.53 kWh per year, and the annual quantitative ecological benefit of a green roof is USD $3.37 m-2. The calculated dynamic investment return is 10 years. A green roof has the benefits of heat preservation and insulation; meanwhile, it can reduce energy consumption. It is also worth mentioning that its energysaving potential and ecological benefits are substantial, and the investment payback time is short, which makes it worth promoting in a large area.

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Section: Introductionmentioning

confidence: 99%

Reduction in Carbon Dioxide Emission and Energy Savings Obtained by Using a Green Roof

Cai

Feng

et al. 2019

Aerosol Air Qual. Res.

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“…Given the complexity of testing the fire resistance performance of green roof coverings, numerical modelling of heat transfer through the roof assembly can be considered a useful tool. Studies on heat transfer analysis through green roofs were conducted before by many authors (Ouldboukhitine et al 2011;Tabares-Velasco and Srebric 2012;Chen et al 2015;Quezada-García et al 2017). The models, however, were developed for normal temperatures, assessing the performance of such roofs in real conditions.…”

Section: Introductionmentioning

confidence: 99%

A conceptual framework for modelling the thermal conductivity of dry green roof substrates

Gerzhova

Côté

Blanchet

et al. 2019

BioRes

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The fire performance of green roofs has never been assessed numerically. In order to simulate its fire behavior, the thermal conductivity of a growing media must be determined as an important input parameter. This study characterized the thermal conductivity of a dry substrate and its prediction as a function of temperature, considering temperature effects on soil organic and inorganic constituents. Experimental measurements were made to provide basic information on thermophysical parameters of the substrate and its components. Thermogravimetric analysis was conducted to consider the decomposition of organic matter. An existing model of the thermal conductivity calculation was then applied. The results of calculated and measured solid thermal conductivity showed close values of 0.9 and 1.07 W/mK, which demonstrates that the model provided a good estimation and may be applied for green roof substrates calculations. The literature data of a temperature effect on soil solids was used to predict thermal conductivity over a range of temperatures. The results showed that thermal conductivity increased and depended on porosity and thermal properties of the soil mineral components. Preliminary validation of obtained temperature-dependent thermal conductivity was performed by experiments and numerical simulation.

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“…using phase change materials to raise the thermal stability to outdoor temperature oscillations [34][35];  optimising solar radiation gains [36][37][38];  use of ventilated windows to reduce heat gain from solar radiation in summer and reduce heat loss in winter [39];  using renewable energy [40][41][42][43][44][45] incl. absorption of solar radiation by the envelope and special indoor elements for heating [46];  using green structures that connect building structures with living plants to increase the thermal resistance of the envelope, perform passive air-conditioning and control solar radiation gains and solar heating of the envelope [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61];  increasing the efficiency of engineering systems, inter alia:…”

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confidence: 99%

Energy Efficiency Issues in Buildings: Analysis of World Practice

Gasimov,

Mammadov,

Akbarova

et al. 2023

VOTHP

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At present, the volume of world energy consumption is continuously and rapidly increasing, which is a consequence of the industrialization process, population growth, increase in energy costs for the extraction of natural resources, etc. Therefore, the importance of solving the problem of energy efficiency is of paramount importance for modern civilization. In this work, there is an analysis of international experience of energy efficient construction. The main directions of energy-efficient development are highlighted. It’s shown that the classical method of heat loss calculations wrongly takes into account the wind effect. The more correct one is required. At the same time, it is worth applying linguistic variables and fuzzy logic, which adequately describe states that are described by verbal statements, and not by numerical values. In conclusion, the most emerging tasks for our Republic are selected: optimal placement of the building on the general plan of the city, incl. maintaining the distance between buildings under the construction and urban-planning regulations; proper heat insulation of the building envelope by the orientation of facades and depending on the climatic parameters of the outside air; air-tightening of building avoiding in- and exfiltration; maximum possible automation of engineering systems up to integration from smart house to smart city level; modernization and optimization of the operation of engineering systems; maximum use of renewable and secondary (such as exhaust air) energy sources; rejection of the classical calculation method of heat loss estimation, which takes into account the effect of wind speed, and to develop a new methodology.

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Toward the practicability of a heat transfer model for green roofs

Cited by 20 publications

References 22 publications

Reduction in Carbon Dioxide Emission and Energy Savings Obtained by Using a Green Roof

Reduction in Carbon Dioxide Emission and Energy Savings Obtained by Using a Green Roof

A conceptual framework for modelling the thermal conductivity of dry green roof substrates

Energy Efficiency Issues in Buildings: Analysis of World Practice

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