Influence of orientation and the impact of external window shading on building thermal performance in tropical climate

Dutta, Arindam; Samanta, Anuva; Neogi, Subhasis

doi:10.1016/j.enbuild.2017.01.018

Cited by 76 publications

(30 citation statements)

References 24 publications

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“…Despite being extremely complex, especially for large objects, this method has been given far worse results than the simplified method of adoption of different shading factors. The reason is that the shadows due to the presence of various shading elements can coincide, partly or as a whole [8]. Consequently, adding the shading reduction factors can significantly overestimate the shading.…”

Section: Case 3 Shaded Positionmentioning

confidence: 99%

The analysis of solar gains calculation methodology defined in SRPS EN ISO 13790, through the use of software for numerical simulation

Bojovic¹

2018

THERM SCI

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By regulations on energy efficiency from 2011, the simplified methodology for calculating solar gains has been defined by the adopted values of solar radiation for whole of Serbia. This paper presents two different methods of solar gains calculation, with the support of the software package KnaufTerm 2, which relies on existing regulations in Serbia, and Ecotect software package, intended for 4-D simulations. The problem has been analyzed in the case of a residential building in Belgrade, by calculating solar gains obtained through one window, for 36 different orientations. Different orientations of the window have shown significant variations in the obtained results, which have been ignored by the rulebook, because it defines only 4 orientations. By this, it was established that four more orientations have to be defined by regulations, with separate values of solar radiation for each position. As the differences in solar gains are most visible in the east, and deviate up to 61%, in the paper then was analyzed calculation method of shading for eastern orientation, which is defined by the rulebook on energy efficiency through a variety of shading factors. The analysis has shown that the methodology defined in the regulations has given drastically lower levels of solar gains at the shaded positions, where the most visible differences were observed in the presence of three shading elements. Also, it is necessary to reconsider the values of the defined shading factors, which are, as showed by 4-D simulations, oversized.

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Section: Case 3 Shaded Positionmentioning

confidence: 99%

The analysis of solar gains calculation methodology defined in SRPS EN ISO 13790, through the use of software for numerical simulation

Bojovic¹

2018

THERM SCI

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“…Therefore, the heat resulting from the radiation was relatively higher than the radiation at lower levels. The building orientation is crucial for reducing the incident solar radiation on the building envelope surfaces [59][60][61][62]. It has been found that the solar radiation could increase by 7.7% when the broader side of the building faced east.…”

Section: Atrium Conditionsmentioning

confidence: 99%

Energy Performance and CO2 Emissions of HVAC Systems in Commercial Buildings

Al-Waked

Nasif

Groenhout³

et al. 2017

Buildings

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Abstract:Energy performance of buildings has attracted much attention among building physicists and engineers worldwide. The effects of building heating; ventilation; and air conditioning (HVAC) systems' design upgrade on the building energy performance are the focus of the current study. The adopted HVAC system consisted of chilled ceiling and chilled beam systems served by a centrifugal water chiller. An energy simulation study was undertaken in accordance with the national Australian built environment rating system-rules for collecting and using data. A three-dimensional simulation study was carried out utilizing the virtual environment-integrated environmental solutions software. Results from the current study have shown the importance of utilizing energy-efficient HVAC systems and HVAC strategies for achieving a high building energy star rating. Recommended strategies in order to achieve the nominated star rating; as predicted by the simulation analysis; were presented. Moreover; the effects of solar radiation inside the building atrium were significant; which cannot be overcome by simply installing a low shading coefficient glazing type at the atrium skylight. In addition to providing chilled ceiling technology; a high efficiency chiller and low energy lighting; it is recommended that the building be well tuned during the commissioning period. The current approach could be extended to accommodate higher energy ratings of commercial buildings at different locations worldwide.

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“…The calculation model for buildings with any orientation should be calculated with building orientation factor as shown in Equation (17). Then Equations (25) and (28) can be formulated as Equations (29) and (30), respectively.…”

Section: The Simplified Calculation Model For Building Envelope Coolimentioning

confidence: 99%

“…The heat gain induced by the building envelope depends upon the solar radiation on various building surfaces. A lot of research has elaborated on the influence of building orientation on building energy consumption in different regions [17][18][19]. Few studies present a detailed factor to show how the orientation influences the building envelope cooling load.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Calculation Method for Building Envelope Cooling Loads in Central South China

et al. 2018

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Abstract:The cooling load calculation of building envelopes is important for building design to realize building energy efficiency. A simplified way to predict the building envelope cooling loads is desperately needed to predict the cooling load of building envelopes with various construction layouts and to predict the energy-saving effect of various reconstruction measures for buildings. In light of this need a simplified calculation model for building envelope cooling loads is proposed in this paper. The model is based on dynamic hourly calculations using EnergyPlus. It considers almost all the thermal factors about the building envelope which may affect the building cooling load and it is studied by dimensional analysis. The equivalent window to wall ratio (EWWR) and building orientation factor are defined to study the building envelope cooling load. The cooling loads of twenty hypothetical buildings with various envelopes are predicated by EnergyPlus. With the results from EnergyPlus the simplified calculation model is developed by MATLAB. Then the newly developed model is validated by two typical actual buildings located in Central-South China. The results show the model is accurate enough to predict the building envelope cooling loads.

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Influence of orientation and the impact of external window shading on building thermal performance in tropical climate

Cited by 76 publications

References 24 publications

The analysis of solar gains calculation methodology defined in SRPS EN ISO 13790, through the use of software for numerical simulation

The analysis of solar gains calculation methodology defined in SRPS EN ISO 13790, through the use of software for numerical simulation

Energy Performance and CO2 Emissions of HVAC Systems in Commercial Buildings

A Simplified Calculation Method for Building Envelope Cooling Loads in Central South China

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