Influence of selected solar positions for shading device calculations in building energy performance simulations

Maestre, Ismael Rodríguez; Blázquez, Juan Luis Foncubierta; Gallero, Francisco Javier González; Cubillas, Paloma R.

doi:10.1016/j.enbuild.2015.05.004

Cited by 28 publications

(9 citation statements)

References 13 publications

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“…In general, because of the ecological and energy efficiency reasons, the local material from the tropical traditional building has been adopted for common living space of the tropical modern building in an urban area. However, the adaption building material to the variation of the environment and its orientation has not been found in the previous studies [1,[14][15][16][17]. Therefore, by this research, the results are expected to reinvigorate local material in adapting to the changed environment for today's building.…”

Section: Resultsmentioning

confidence: 65%

An integrated control on thermal and noise environment of tropical building material

2018

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The environmental problems of thermal and noise environment are recently considered the most important contributors to the tropical building in an urban area. The porous tropical materials provide both a solution for cooling and airborne noise problem from the source to receiver when the wind is in the same direction. This research optimizes the integrated control of thermal and noise environment which are directed into building material evaluation. Surabaya is selected as representative of the hotter area of the lowland while Malang is determined as the colder urban area of the highland. An eco-tropical lightweight material, wood, is examined as a case study. The field measurement for surface material temperature and its transmission loss were conducted in order to give information on thermal and acoustical properties of the material. The optimization is conducted by comparing Sound Reduction Index and by Conduction Heat Flow. The results highlighted that for the same material, the thickness that effect on its mass is important for both thermal and noise control. The higher the thickness is, the higher the Sound Reduction Index and the lower the conduction heat flow are. Modifying material by adding the thickness of wood results that by material mass minimum 36.5 kg/m2, the critical lowland building meets the standard of World Health Organization noise limits and has lower heat gain.

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Section: Resultsmentioning

confidence: 65%

An integrated control on thermal and noise environment of tropical building material

2018

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“…Furthermore, the following angular discretization of the hemispherical sky has been used: 2 • and 10 • divisions for solar altitude and 2 • , 5 • , 10 • and 15 • for azimuth ( Figure 2). A more detailed description can be found in Maestre et al [15].…”

Section: Indicatorsmentioning

confidence: 99%

“…al. [15], it may be more appropriate to apply the methodology proposed by these authors. This methodology is that the deviation is measured through its effect on the so-called shading factor, SF , defined as the ratio between the global solar radiation received on a surface in the presence of shading obstacles and in their absence.…”

Section: Indicatorsmentioning

confidence: 99%

“…In order to quantify the effect of the deviation in the pre-calculated solar position from the real position, some authors have proposed measuring the error in the estimation of the annual incident energy on the building [16]. However, to avoid the detected compensation of errors by Maestre et al [15], it may be more appropriate to apply the methodology proposed by these authors. This methodology is that the deviation is measured through its effect on the so-called shading factor, SF, defined as the ratio between the global solar radiation received on a surface in the presence of shading obstacles and in their absence.…”

Section: Indicatorsmentioning

confidence: 99%

“…Traditionally, due to the high computational cost of this demanding process, BEPS programs often use an approximation in which shading calculations are made for one representative day of the month (DPM Methods). The study carried out by Maestre et al [15] shows that DPM methods obtain errors of up to 26% in the estimation of incident total solar radiation for different geometric configurations of overhangs and sidefins. EnergyPlus [10] allows the user to adjust both the period (20 days by default) and the time-step (15 min by default).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sky Discretization for Shading Device Calculation on Building Energy Performance Simulations

et al. 2020

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The calculation of sunlit surfaces in a building has always been a relevant aspect in building energy simulation programs. Due to the high computational cost, some programs use algorithms for shading calculation for certain solar positions after discretization of hemispherical sky. The influence of the level of discretization on the estimation of incident direct radiation on building surfaces, as well as on the required computational times, are studied in this work. The direct solar energy on a window for a year, with simulation time steps of five minutes, has been simulated by using an algorithm based on Projection and Clipping Methods. A total of 6144 simulations have been carried out, varying window sizes, window orientations, typologies of shading devices, latitudes and discretization levels of the hemispherical sky. In terms of annual incident solar energy, the results show that maximum error values are about 5% for a low level of angular discretization. Errors up to 22% in hourly incident solar energy have been estimated for some of the configurations analysed. Furthermore, a great number of configurations show errors of shading factor on a window of up to 30%, which could be most relevant in studies of natural lighting. The study also shows that the improvement achieved by the most accurate discretization level implies an increase in computational cost of about 30 times.

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Evaluation of the Computation Times for Direct and Iterative Resolution Methods of MTJ Library Matrices Applied in a Thermal Simulation System

Cedeño

Vásquez-Bermúdez

Blázquez

et al. 2018

Communications in Computer and Information Science

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Influence of selected solar positions for shading device calculations in building energy performance simulations

Cited by 28 publications

References 13 publications

An integrated control on thermal and noise environment of tropical building material

An integrated control on thermal and noise environment of tropical building material

Effect of Sky Discretization for Shading Device Calculation on Building Energy Performance Simulations

Evaluation of the Computation Times for Direct and Iterative Resolution Methods of MTJ Library Matrices Applied in a Thermal Simulation System

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