Effect of facade components on energy efficiency in office buildings

Ihara, Takeshi; Gustavsen, Arild; Jelle, Bjørn Petter

doi:10.1016/j.apenergy.2015.08.074

Cited by 83 publications

(30 citation statements)

References 36 publications

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“…The quest for improved energy efficiency and thermal comfort in existing buildings most often involves an all-encompassing approach, incorporating enhanced cost-effective building fabric retrofitting. Therefore, it has become crucial that an energy-efficient façade is used, in order to reduce the CO 2 emissions throughout the operational life cycle of a building [7].…”

Section: Introductionmentioning

confidence: 99%

Impact of Window Films on the Overall Energy Consumption of Existing UK Hotel Buildings

et al. 2017

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Abstract:Recently, considerable attention has justifiably been directed towards energy savings in buildings as they account for up to 20-40% of total energy consumption in developed countries. In the United Kingdom, studies have revealed that buildings' CO 2 emissions for account for at least 43% of total emissions. Window panels are a major component of the building fabric with considerable influence on the façade energy performance and are accountable for up to 60% of a building's overall energy loss. Therefore, the thermal performance of glazing materials is an important issue within the built environment. This work evaluates the impact of solar window films on the overall energy consumption of an existing commercial building via the use of a case study U.K. hotel and TAS dynamic simulation software. The study results demonstrated that the impact of window films on the overall energy consumption of the case study hotel is approximately 2%. However, an evaluation of various overall energy consumption components showed that the window films reduce the annual total cooling energy consumption by up to 35% along with a marginal 2% increase in the annual total heating energy consumption. They can also provide overall cost and CO 2 emissions savings of up to 3%.

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Section: Introductionmentioning

confidence: 99%

Impact of Window Films on the Overall Energy Consumption of Existing UK Hotel Buildings

et al. 2017

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“…The impact of the new solutions on the building energy performance was simulated through EnergyPlus™ 8.4, over a time interval of 1 year, with data points gathered every hour and taking into account different climatic conditions: Rome (Italy), characterized by a hot climate, Paris (France) and Turin (Italy), with a moderate climate, and Helsinki (Finland) with a cold climate. In order to optimize the façade configuration, a comprehensive approach was used and the heating, cooling, and artificial lighting energy demands were calculated [26,27]. A screen was considered as external shading device (solar transmittance equal to 0.1, light transmittance equal to 0.15), for reducing the cooling loads due to the large windows in the east and west walls.…”

Section: Building Simulationsmentioning

confidence: 99%

Experimental and Numerical Energy Assessment of a Monolithic Aerogel Glazing Unit for Building Applications

et al. 2019

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In the last few decades, the attention of researchers has been focused on the characterization of aerogels in order to improve the thermal performance of transparent building envelopes. Granular aerogel is already spread in the market thanks to the easy manufacturing system, whereas the difficulty in producing monoliths without defects, cracks, and inhomogeneity limited the diffusion of monolithic aerogel systems. A new production process for the monolithic panels was developed at Union College (Schenectady, NY, USA); it is a rapid supercritical extraction technique which allows a reduction in production time (only a few hours) and results in less solvent waste. Panes with maximum dimensions of about 100 × 100 mm were fabricated and composed in a unique glazing system, with external dimensions 300 × 300 mm. The thermal characterization of the innovative monolithic aerogel glazing system (simple float glazing 4.7-mm-thick monolithic aerogel pane 15-mm-thick simple float glazing 4.7 mm thick), which was carried out by means of a Small Hot Box apparatus, showed a thermal transmittance value of about 1.1 W/(m 2 K). Data was used in dynamic simulations of a typical non-residential building. They showed that the new investigated solution allows a valuable reduction with respect to a low-e double glazing system in terms of heating energy demand (about 5-7% for Helsinki, 8-12% for Paris, and 10-15% for Turin), for different window-to-wall ratios. monolithic form is the difficulty in fabrication of samples without defects, cracks, and inhomogeneity, and their high cost [5]. In the last years, a rapid supercritical extraction method was developed at Union College (Schenectady-NY), allowing a significant reduction in fabrication times (6-8 hours) and in solvent waste. Good optical properties can be obtained (τ v > 80%); when assembled with two glasses (total thickness 22 and 12.7 mm of aerogel), a thermal resistance of 0.86 and 1.55 m 2 K/W is obtained at atmospheric pressure and in evacuated conditions, respectively [6,7].Guoqing Zu et al. evaluated the thermal performance of monolithic alumina aerogel systems, prepared by a sol-gel method combined with the ethanol supercritical drying technique [8]. The thermal conductivities at 30 • C and 400 • C were 0.028 and 0.065 W/mK, respectively [8]. Duer and Svendsen [9] presented the main results of a research project founded by the European Commission. They discussed an aerogel pane prototype of 450×450x15 mm 3 , made under vacuum conditions and sandwiched between two glasses; a conductivity value of about 0.010 W/mK was measured at ambient temperature.Another interesting study presents a detailed investigation of the mechanical microstructural and thermal properties of monolithic aerogels made from polyethoxydisiloxane [10]. The thermal conductivity is highly dependent on the densities of monolithic panes; a minimum value of 0.0135 W/mK was measured for a density of 120 kg/m 3 , a maximum value of 0.024 W/mK for about 300 kg/m 3 . Similar values of thermal conductivity were fo...

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“…Under intermittent energy consumption pattern, exterior wall/external insulation can decrease heating load of buildings but may not reduce cooling load. Tummu et al [6,7] in Thailand and Ihara et al [8] in Japan discovered that, under intermittent energy consumption pattern, exterior wall/external insulation of buildings shows an "anti-energy saving" effect. Energy-saving efficiency of insulation measures is related to local climatic conditions.…”

Section: State Of the Artmentioning

confidence: 99%

Building Energy Efficiency Design for Waiting Halls of Railway Stations in the Hot- summer and Cold-winter Region

Yang¹

2017

JESTR

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Waiting halls of railway stations are typically structured as large-spaced buildings and consume a large amount of energy. This study aimed to explore the effect of the law of thermal properties of waiting hall enveloped in railway stations on building energy consumption and to disclose the energy-saving potential of waiting hall of railway stations. A waiting hall model based on the waiting hall of the Chengdu Railway Station was established using the Quick Energy Simulation Tool (eQUEST). Numerical simulation on energy consumption of waiting hall was conducted by changing the performance parameters of building envelope and area ratio of skylight and sun-shading mode. The influences of thermal properties of building envelope on energy consumption were discussed. Results demonstrate that, when the waiting hall of the railway station applies a glass curtain wall as the envelope, the coated insulting glasses used contribute to the low building energy consumption with an energy saving rate of 5.3%. With the increase in area ratio of skylight, building energy consumption decreases first and then increases. The rate reaches the valley at 20% area ratio of skylight. Sunshading measures on the glass curtain wall and skylight, especially external sun-shading measure, can significantly reduce building energy consumption. The findings provide theoretical basis for building energy efficiency design for the waiting halls of railway stations in regions with hot summer and cold winter, and have important theoretical significance and engineering application value in promoting building energy efficiency design in the said regions.

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Effect of facade components on energy efficiency in office buildings

Cited by 83 publications

References 36 publications

Impact of Window Films on the Overall Energy Consumption of Existing UK Hotel Buildings

Impact of Window Films on the Overall Energy Consumption of Existing UK Hotel Buildings

Experimental and Numerical Energy Assessment of a Monolithic Aerogel Glazing Unit for Building Applications

Building Energy Efficiency Design for Waiting Halls of Railway Stations in the Hot- summer and Cold-winter Region

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