Evaluation of impact of passive design measures with energy saving potential through estimation of shading control for visual comfort

Sharma, Lakshya; Lal, Kanhaiya; Rakshit, Dibakar

doi:10.1177/1744259117742989

Cited by 24 publications

(12 citation statements)

References 7 publications

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“…Devices with larger factors can block direct sunlight from more angles and achieve low solar heat gain. However, the devices can also block the view from inside, affecting the visual comfort [47]. A fixed external shading device may block solar energy from entering and heating up rooms, subsequently increasing the heating load in winter.…”

Section: Literature Reviewmentioning

confidence: 99%

Revealing the Impacts of Passive Cooling Techniques on Building Energy Performance: A Residential Case in Hong Kong

Guo

Wang

et al. 2020

Applied Sciences

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Environmental concerns and growing energy costs raise the importance of sustainable development and energy conservation. The building sector accounts for a significant portion of total energy consumption. Passive cooling techniques provide a promising and cost-efficient solution to reducing the energy demand of buildings. Based on a typical residential case in Hong Kong, this study aims to analyze the integration of various passive cooling techniques on annual and hourly building energy demand with whole building simulation. The results indicate that infiltration and insulation improvement are effective in regard to energy conservation in buildings, while the effectiveness of variations in building orientation, increasing natural ventilation rate, and phase change materials (PCM) are less significant. The findings will be helpful in the passive house standard development in Hong Kong and contribute to the further optimization work to realize both energy efficiency and favorably built environments in residential buildings.

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Section: Literature Reviewmentioning

confidence: 99%

Revealing the Impacts of Passive Cooling Techniques on Building Energy Performance: A Residential Case in Hong Kong

Guo

Wang

et al. 2020

Applied Sciences

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“…BIPVs have been investigated in many aspects: modeling and design methods [18][19][20], performance [21], application of semi-transparent solar cells integrated on windows [22,23], etc. Shading device control has also been widely studied, with a main focus on energy efficiency and occupant comfort [24][25][26]. However, the combination of BIPV and louver-type shading device requires further investigation, especially on control method and performance.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Control Methods for PV-Integrated Shading Devices

Jung¹,

Kim

Moon

2020

Energies

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This study aimed to develop a building-integrated photovoltaic (BIPV) device and optimal control methods that increase the photovoltaic (PV) efficiency and visual comfort of the indoor space. A louver-type PV-integrated shading device was suggested and an artificial neural networks (ANN) model was developed to predict PV electricity output, work plane illuminance, and daylight glare index (DGI). The slat tilt angle of the shading device was controlled to maximize PV electricity output based on three different strategies: one without visual comfort constraints, and the other two with visual comfort constraints: work plane illuminance and DGI. Optimal tilt angle was calculated using predictions of the ANN. Experiments were conducted to verify the system modeling and to evaluate the performance of the shading device. Experiment results revealed that the ANN model successfully predicted the PV output, work plane illuminance, and DGI. The PV-integrated shading device was more efficient in producing electricity than the conventional wall-mount PV systems, the control method without visual comfort constraints was most efficient in generating electricity than the other two with such constraints, and excluding the constraints resulted in less comfortable visual environment and reduced energy benefit. From the results analysis, it can be concluded that based on the accurate predictions, the PV-integrated shading device controlled using the proposed methods produced more electricity compared to the wall-mount counterpart.

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Section: Introductionmentioning

confidence: 99%

“…The heating thermostat set point is often different than the cooling thermostat set point both to save energy and because of human preference. The distribution of heating and cooling loads is climate dependent [9].Material choices, envelope design, and envelope sealing dramatically affect the amount of solar conducted and convection energy that enters and leaves the building envelope [10]. The degree of impact of each of these on building loads and the occupants' comfort also depend on the temperature and humidity differences between indoors and outdoors, which are all constantly changing by season and time of day [11].…”

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confidence: 99%

Improvement of winter heat balance of workshops

Cao

Kic

2018

Engineering for Rural Development

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Abstract. The aim of this paper is to describe the principles and methods of heat balance calculation in winter, which can be useful for assessment and improvement of heat transmission in the building. There are set up formulas and calculated the required heating capacity in two workshops to keep the standard internal temperature (from 16 °C to 20 °C) for students' practice during a winter day with external temperature about -12 °C. In the frame of this research, the structure of two workshops was directly measured and surveyed, and along with it, there were also the construction documents consulted. The formulas for heat balance calculation were set up from theories of energy balance and real construction of the building. The reduction of roof windows' area or improvement of the shape of the windows would influence the heat losses of the building. There can be also the heat exchange and efficiency of the heating equipment improved. The obtained results are the basis for proposal of a suitable building design, choosing and using of heating systems to achieve reasonable and economical conditions. The difference between workshops shows the influence of the structure of the workshop on the heat balance. As a general conclusion, it must be said that the roof windows' areas have a big influence on the heat transmission and they are the main factor responsible for heat losses and heat gains in the buildings. The formula could be useful for the designer of the building, which saves time, cost, energy and resources to keep indoor thermal comfort for the workers' performance.Keywords: calculation, heat transfer, temperature, workshop. IntroductionBy understanding the building's thermal loads and its intended using, we can more effectively use energy from the sun to save energy from the passive heat system [1]. We can even generate energy onsite using resources that would otherwise be thermal loads that would demand energy. High performance buildings seek to reduce these loads as much as possible [2; 3].The thermal load includes external thermal loads and internal thermal loads. External thermal loads come from heat transfer through the building envelope from the sun, weather, and the outside environment [4; 5]. The building envelope includes roofs, floors, walls, windows, and any other surfaces that separate the inside and outside of the building. The building envelopes interact with external thermal load to product external gains or losses for the building.The internal thermal loads come from heat generated by people, lighting, and equipment. In winter, the internal gains by people and lighting are not enough to keep warm inside the building [6]. Therefore, designers have to calculate, how much heat energy to use for warming up and then they will choose suitable heat equipment to achieve reasonable and economical conditions.In summer, the external heat that enters through the building is very high. The common ways are solar radiation and indirect solar gains that warm up exterior building surfaces [7].In winter, mainly ...

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Evaluation of impact of passive design measures with energy saving potential through estimation of shading control for visual comfort

Cited by 24 publications

References 7 publications

Revealing the Impacts of Passive Cooling Techniques on Building Energy Performance: A Residential Case in Hong Kong

Revealing the Impacts of Passive Cooling Techniques on Building Energy Performance: A Residential Case in Hong Kong

Performance Evaluation of Control Methods for PV-Integrated Shading Devices

Improvement of winter heat balance of workshops

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