A numerical study of cool and green roof strategies on indoor energy saving and outdoor cooling impact at pedestrian level in a hot arid climate

IF 2.2 4区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Building Performance Simulation Pub Date : 2022-09-02 DOI:10.1080/19401493.2022.2110944

M. Elnabawi, E. Saber

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引用次数: 8

Abstract

Green and cool roofs retrofit technologies, aim to mitigate the urban heat island effect and cooling energy demands from buildings. This study reports on parametric energy modelling of energy saving loads and indoor air temperature, as well as microclimate modelling of outdoor air temperature. The work adds new knowledge by evaluating roof retrofit technologies at the building and neighbourhood scale, and the results should guide strategic decisions for building envelope retrofitting. The simulations respectively predicted a 10% and 7.5% reduction in the cooling load for cool and green roofs versus a conventional roof. In summer, the indoor air temperature was similar for these roofs, but in winter the cool roof's indoor air temperature was 0.5°C lower than the green. In the microclimate simulation, average roof surface temperatures were 31.5°C (cool) and 31.3°C (green), versus 40.2°C (conventional); the air temperature difference was −0.8°C (cool) and −0.6°C (green) against the conventional roof.

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在炎热干旱气候下，凉爽屋顶和绿色屋顶策略对室内节能和室外降温影响的数值研究

绿色和凉爽的屋顶改造技术，旨在减轻城市热岛效应和冷却能源需求的建筑物。本研究报告了节能负荷和室内空气温度的参数化能量模型，以及室外空气温度的微气候模型。这项工作通过在建筑和社区尺度上评估屋顶改造技术增加了新的知识，结果应该指导建筑围护结构改造的战略决策。模拟分别预测，与传统屋顶相比，凉爽屋顶和绿色屋顶的冷负荷分别减少了10%和7.5%。在夏季，这些屋顶的室内空气温度相似，但在冬季，凉爽屋顶的室内空气温度比绿色低0.5℃。在小气候模拟中，平均屋顶表面温度为31.5°C(冷)和31.3°C(绿色)，而传统的为40.2°C;与传统屋顶相比，空气温差为−0.8°C(冷)和−0.6°C(绿)。

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来源期刊

Journal of Building Performance Simulation CONSTRUCTION & BUILDING TECHNOLOGY-

CiteScore

5.50

自引率

12.00%

发文量

审稿时长

12 months

期刊介绍： The Journal of Building Performance Simulation (JBPS) aims to make a substantial and lasting contribution to the international building community by supporting our authors and the high-quality, original research they submit. The journal also offers a forum for original review papers and researched case studies We welcome building performance simulation contributions that explore the following topics related to buildings and communities: -Theoretical aspects related to modelling and simulating the physical processes (thermal, air flow, moisture, lighting, acoustics). -Theoretical aspects related to modelling and simulating conventional and innovative energy conversion, storage, distribution, and control systems. -Theoretical aspects related to occupants, weather data, and other boundary conditions. -Methods and algorithms for optimizing the performance of buildings and communities and the systems which service them, including interaction with the electrical grid. -Uncertainty, sensitivity analysis, and calibration. -Methods and algorithms for validating models and for verifying solution methods and tools. -Development and validation of controls-oriented models that are appropriate for model predictive control and/or automated fault detection and diagnostics. -Techniques for educating and training tool users. -Software development techniques and interoperability issues with direct applicability to building performance simulation. -Case studies involving the application of building performance simulation for any stage of the design, construction, commissioning, operation, or management of buildings and the systems which service them are welcomed if they include validation or aspects that make a novel contribution to the knowledge base.