Optimal insulation thickness of common classic and modern exterior walls in different climate zones of Iran

Rosti, Behnam; Omidvar, Amir; Monghasemi, Nima

doi:10.1016/j.jobe.2019.100954

Cited by 45 publications

(28 citation statements)

References 23 publications

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“…Many authors considered the optimization of the insulation thickness of the external envelope considering three different aspects: environmental, energy and, economic [44]. The performance of the buildings was compared in terms of the energy demand for heating and cooling respectively (kWh/(m 2 year) and MWh/year), net cost for energy for heating and cooling ($/m 2 ) [45][46][47], the global warming potential (GWP) for the evaluation of CO 2 emissions into the atmosphere, the total cost including energy and environmental cost [48,49], and the payback period [50,51]. For instance, D'Agostino et al [46], through a cost-optimal analysis for the optimization of the insulation layer in an office building, showed that excessive insulation in a Mediterranean climate does not always lead to an advantage in terms of energy savings, mainly due to the increased energy requirements for cooling during the summer season.…”

Section: State Of the Artmentioning

confidence: 99%

Evaluation of Environmental and Economic Sustainability for the Building Envelope of Low-Carbon Schools

2021

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To achieve a carbon-free economy by 2050, the construction of low-carbon schools in Italy must select the proper structural and technological solutions for the building envelope while ensuring a low economic cost. The aim of this study was to analyze and compare several technological solutions for the building envelope and the related structural solutions in terms of thermo-dynamic properties, energy performance, environmental sustainability parameters, and economic evaluations, to obtain one or more alternatives. After a general study, the binomial load-bearing structure–external wall was investigated given its strong influence on both the environment and the total cost. The solutions were used in a new typological model for the kindergarten. All the solutions are comparable from an energy and environmental point of view, obtaining a primary energy demand of <25 kWh/(m2year) and an environmental impact of <20 kWh/(m2year). However, considering the economic factor and analyzing the binomial load-bearing structure–external wall, the advisable solutions are those that use wooden structures with insulation layer in wood fiber as they have a significantly lower environmental impact, along with the same good energy performance and have an acceptable cost compared to other analyzed solutions.

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Section: State Of the Artmentioning

confidence: 99%

Evaluation of Environmental and Economic Sustainability for the Building Envelope of Low-Carbon Schools

2021

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“…The results of this optimization will be compared with the prescribed method of chapter 19 and ASHRAE standard 90.2. Furthermore, Rosti et al [23] have also utilized the same LCC approach to obtain the optimal insulation thickness for nine cities in Iran and these results will also be used for comparison.…”

Section: Regulations Standard and Codes On Energy Efficiency For Buildings In Iranmentioning

confidence: 99%

“…The optimized wall thermal resistance (insulation thickness, EPS) will also be compared to the minimum requirements in chapter 19. Rosti et al [23] have recently used a similar methodology to optimize the insulation thickness of common and modern wall structures in several cities in Iran. The optimal insulation thickness is used to calculate the optimal thermal resistance.…”

Section: Optimum Wall Thermal Resistance: Summary Of the Lcc Approachmentioning

confidence: 99%

Optimum envelope design toward zero energy buildings in Iran

Ramin

Karimi

2020

E3S Web Conf.

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Buildings, commercial and residential combined, account for around 40% of total energy consumption in Iran. Energy consumption in buildings is predicted to increase in the the coming decades decades and immediate actions are required to meet the needs of future generations. Zero energy building (ZEB) is an important concept that can help nations to have a sustainable future. An important step for building a ZEB is to minimize the energy lost from the building, and the envelope of buildings plays a vital role in achieving minimal energy losses. In this paper, a life cycle cost (LCC) analysis is adopted to find the optimum insulation thickness for the common wall structure in Iran. Then, the Iranian standard (Chapter 19) for building envelopes have been reviewed and compared with the minimum requirements of the ASHRAE standard 90.2. The comparison shows that the Iranian standards for buildings envelopes are comparable with the ASHRAE standard 90.2 for the external wall, while ASHRAE requires higher minimum thermal resistance for ceiling compare to chapter 19. The optimization results suggest smaller minimum thermal resistance compare to chapter 19; this is mainly resulting from the characteristic of the Iranian economy (high inflation rate) and subsidized energy sector. Therefore, energy policy in the country needs to be reformed to promote energy conservation in buildings and hence zero energy buildings.

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“…The optimum thermal transmittance coefficient of building facade and windows require to ensure the low investment and life cycle cost, improving building energy efficiency that complies with the national NZEB benchmark and a healthy indoor climate condition. Rosti et al [10] obtained the ideal insulation thickness of the external wall in eight climate zones in Iran. The results were obtained from the numerical solution under dynamic thermal conditions, which acknowledged the energy-saving potentials and payback period.…”

Section: Introductionmentioning

confidence: 99%

“…The results were obtained from the numerical solution under dynamic thermal conditions, which acknowledged the energy-saving potentials and payback period. Bolatturk [11] used a life-cycle cost analysis approach, similar to Rosti et al [10], to find out the optimum insulation thicknesses for four climate zones in Turkey. Beyond these, D'Agostino et al [12] used the cost-optimal methodology to describe the optimum insulation thickness of an office building for cities of Palermo, Milan, and Cairo.…”

Section: Introductionmentioning

confidence: 99%

New Equation for Optimal Insulation Dependency on the Climate for Office Buildings

Ahmed

Kurnitski

2021

Energies

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The comparison of building energy efficiency in different climates is a growing issue. Unique structural solutions will not ensure the same energy use, but the differences also remain if cost-optimal solutions are applied. This study developed a new equation for the assessment of building envelope optimal insulation in different climates for office buildings. The developed method suggests determining actual degree days from simulated heating energy need and the thermal conductance of a building, avoiding in such a way the use of a base temperature. The method was tested in four climates and validated against cost-optimal solutions solved with optimization. The accuracy of the method was assessed with sensitivity analyses of key parameters such as window-to-wall ratios (WWRs), window g-values, costs of heating, and electricity. These results showed that the existing square root equation overestimated the climate difference effect so that the calculation from the cold climate U-value resulted in less insulation than cost-optimal in warmer climates. Parametric analyses revealed that the power value of 0.2 remarkably improved the accuracy as well as performance worked well in all cases and can be recommended as a default value. Sensitivity analyses with a broad range of energy costs and window parameters revealed that the developed equation resulted in maximum 5% underestimation and maximum 7% overestimation of an average area-weighted optimal U-value of building envelope in another climate. The developed method allows objectively to compare optimal insulation of the building envelope in different climates. The method is easy to apply for energy performance comparison of similar buildings in different climates and also for energy performance requirements comparison.

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Optimal insulation thickness of common classic and modern exterior walls in different climate zones of Iran

Cited by 45 publications

References 23 publications

Evaluation of Environmental and Economic Sustainability for the Building Envelope of Low-Carbon Schools

Evaluation of Environmental and Economic Sustainability for the Building Envelope of Low-Carbon Schools

Optimum envelope design toward zero energy buildings in Iran

New Equation for Optimal Insulation Dependency on the Climate for Office Buildings

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