scholarly journals Daylight glare mitigation by internal shading devices use and effects on building energy performance

2019 ◽  
pp. 164-184
Author(s):  
Dayan de Loyola R. Garcia ◽  
Fernando Oscar R. Pereira
Keyword(s):  
Thermal Environment ◽  
Building Design ◽  
Energy Performance ◽  
Design Guidelines ◽  
Indoor Environmental Quality ◽  
Heat Gain ◽  
Solar Heat ◽  
Solar Heat Gain ◽  
Shading Devices ◽  
Building Cooling

Daylight glare arouses buildings’ occupants to insert internal shading devices. When solving glare issues, shading strategies can increase internal temperature and building cooling energy consumption, especially in hot climates. Indoor environmental quality has been treated through architectural and engineering projects utilising spatial-temporal metrics and controls algorithms. This article focused on investigating some interactions between user behaviour, shading devices proprieties, and their effects on building’s luminous and thermal environment. This research aimed to relate daylight glare probability’s reductions through internal shading devices uses, with their effects on the window’s solar heat gain and energy cooling demand. Using building modelling and simulation approach through Rhinoceros 3D 5.0 and plug-ins Grasshopper+DIVA, Daylight Glare Probability (DGP) hourly values were generated for an occupant, 1.5 m away from the window at a side lit-room. The open-access model is a typical private office in the multi-floors building. Window’s solar heat gains and energy cooling demands were recorded using EnergyPlus 8.4 software. The model was simulated in East, West, North and South orientations, at Florianópolis. Subtropical Brazilian city. Starting from ‘without solar control’ cases, 8 controls were applied to 4 internal shading devices: blinds 50°, blinds 0°, curtains and roller shades. Clearer and darker colours were considered by two proprieties sets. From two fixed obstruction modes (100% and 50%), DGPintolerable (>45%) and direct solar radiation (>50W/m²) were applied to proposed monthly, daily and automatic controls. DGPintolerable annual frequencies at uncontrolled condition varied from 30% to 65%. These differences pointed out design guidelines according to façades. It has been confirmed that 0° blinds don’t secure daylight glare and increase energy cooling demand. Dark roller shades, curtains and blinds 50° completely solved glare problems, controlled by ‘always 100% closed’ mode and DGPintolerable based controls. Clear devices still allowed 2% of DGPintolerable frequency. However, clear roller shades contributed to reducing annual cooling demand until 11.5% while other devices achieved until 52% increase. Dark curtains indicated maximum increased in annual window’s solar heat gain (3%). Obtained results allowed identifying some design guidelines to balance daylight glare protection and energy-efficiency, contributing to sustainable building design and low impact architecture.

scholarly journals Window assessment at different level height on a Portuguese typical street canyon

2019 ◽  
Vol 4 (2) ◽  
pp. 143-159
Author(s):  
Jorge S. Carlos
Keyword(s):  
Street Canyon ◽  
Building Design ◽  
Indoor Environmental Quality ◽  
Building Stock ◽  
Heat Gain ◽  
Solar Heat ◽  
Simulation Tools ◽  
Heating And Cooling ◽  
Solar Heat Gain ◽  
Daylight Performance

This paper presents the results of a study investigating the ventilation mode, the solar heat gain and daylight performance via vertical fenestration on a street canyon. In recent years there has been a growing awareness in energy-efficient building design and operation of the building stock. Dynamic envelope/window systems have potential to optimize the performance of the building, between airing, solar heat gain and daylight admission. However, higher thermal resistance glazing implies a reduction of solar transmittance. A typical street canyon in Portugal was used for the present study. Three different room ratios and two types of windows at two different floors were used for comparison. Different simulation tools were used during this study. To be comparable with other studies several ratios were present, as the window/wall, the glazing/wall ratios, the window/floor and the glazing/floor ratios as well as the window opening area. This paper presents the obtained airflow and solar gains on both heating and cooling season in addition to the level of daylight factor. It was found that specific adaptive actions to improve indoor environmental quality and reduce the need of energy consumption are needed.

Hot-cool box calorimetric determination of the solar heat gain coefficient and the U-value of internal shading devices

2017 ◽  
Vol 10 (6) ◽  
pp. 1553-1571 ◽  
Author(s):  
Ayelén Villalba ◽  
Erica Correa ◽  
Andrea Pattini ◽  
Daniel Vicare
Keyword(s):  
Gain Coefficient ◽  
Heat Gain ◽  
Solar Heat ◽  
U Value ◽  
Solar Heat Gain ◽  
Shading Devices ◽  
Calorimetric Determination

The contribution of solar radiation to the thermal environment of man in Antarctica

1961 ◽  
Vol 155 (959) ◽  
pp. 243-265 ◽  
Keyword(s):  
Solar Radiation ◽  
Heat Loss ◽  
Thermal Environment ◽  
Ambient Air ◽  
Whole Body ◽  
Cooling Power ◽  
Effective Surface ◽  
Heat Gain ◽  
Solar Heat ◽  
Solar Heat Gain

The parameters of solar radiation affecting man in Antarctica are considered, using data from two coastal stations and from the South Pole. Observations of solar radiation and its effects on clothing and skin temperatures of men standing on snow at Scott Base are reported. From measurements of the spectral reflectance of the outer garments and the regional thermal insulation of the clothing made subsequently, the solar heat gain at the clothing surface and its effect on heat transmission through the clothing and on heat loss to the environment were calculated. The effective surface area of the clothed body surface exposed to direct and reflected solar radiation, and the effective surface areas concerned in low temperature radiation exchange and convective heat loss, are considered. An attempt was made to determine these areas by direct measurement. The results were used to calculate values for the solar heat gain by the whole body and the cooling power of the environment under Antarctic conditions, the combined effects of which are expressed in terms of a temperature increment to be added to the ambient air temperature.

scholarly journals Method of assessing the reduction of solar heat on window surface shaded by continuous vertically slanted shading devices

2021 ◽  
Vol 15 (3) ◽  
pp. 185-198
Author(s):  
Tran Ngoc Chan ◽  
Pham Thi Hai Ha ◽  
Pham Van Luong ◽  
Nguyen Thi Khanh Phuong
Keyword(s):  
Diffuse Radiation ◽  
Heat Gain ◽  
Slant Angle ◽  
Solar Heat ◽  
Solar Shading ◽  
Reduction Coefficient ◽  
Gain Reduction ◽  
Solar Heat Gain ◽  
Shading Devices ◽  
Shading Device

The research discusses calibration of the method used to calculate solar heat transfer through shaded windows with continuous vertical slanted shading devices (below is abbreviated as "vertical slanted fins") with any slant angle Θ through a radiation reduction coefficient - Kbt. In order to evaluate the reduction of solar heat on window surface shaded by shading devices, a designated coefficient β of solar heat gain reduction through glazed windows should be established. It is the ratio of the transmitted amount of solar heat (including direct and diffuse radiation) through windows with shading device QK to those without solar shading device QKo. The study also introduces two in-house software programs. These programs help calculating solar heat gain and coefficient β for vertically slanted fins with any slant angle θ for 16 window orientations. The results of this study will be applied to the implementation of the Vietnamese national code QCVN 09:2017/BXD towards energy efficiency in buildings.

Shading Devices to Limit Solar Heat Gain But Increase Cold Sky Radiation

1965 ◽  
Vol 8 (4) ◽  
pp. 0470-0472
Author(s):  
L. W. Neubauer and R. D. Cramer
Keyword(s):  
Heat Gain ◽  
Solar Heat ◽  
Solar Heat Gain ◽  
Shading Devices

scholarly journals SURVEY OF THERMAL INSULATION PERFORMANCE AND SOLAR HEAT GAIN PERFORMANCE OF WINDOWS WITH SHADING DEVICES USING A FULL-SCALE EXPERIMENTAL BUILDING

2020 ◽  
Vol 26 (64) ◽  
pp. 1001-1006
Author(s):  
Keiichiro TANIGUCHI ◽  
Masayuki MAE ◽  
Siyu JI ◽  
Kozo TAKASE ◽  
Teruki KOJIMA ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Full Scale ◽  
Heat Gain ◽  
Solar Heat ◽  
Solar Heat Gain ◽  
Shading Devices ◽  
Insulation Performance

Mathematical optimisation of location and design of windows by considering energy performance, lighting and privacy of buildings

2019 ◽  
Vol 8 (2) ◽  
pp. 117-137 ◽  
Author(s):  
Ahmed Hammad ◽  
Ali Akbarnezhad ◽  
Hanna Grzybowska ◽  
Peng Wu ◽  
Xiangyu Wang
Keyword(s):  
Energy Performance ◽  
Objective Analysis ◽  
Mena Region ◽  
Heat Gain ◽  
Content Type ◽  
Support Tool ◽  
Solar Heat ◽  
Conflicting Objectives ◽  
Solar Heat Gain ◽  
Mathematical Optimisation

Purpose The Middle East and North Africa (MENA) region is known for its extreme weather conditions during Summer. A major determinant of the sustainability of the design of a building is its fenestrations. The purpose of this paper is to explore the problem of designing and locating windows on building facades such that a number of relevant criteria to the MENA region are optimised, including solar heat gain, privacy, daylighting and cost of installation. Design/methodology/approach A multi-objective optimisation problem is proposed with the focus on capturing the requirements of residential dwellings in the MENA region. Since the problem contains conflicting objectives that need to be optimised, a lexicographic approach is adopted. In order to display the Pareto curve, a bi-objective analysis based on the ε-constraint method is utilised. Findings The conflicting nature of the proposed problem is indicated via the Pareto optimal solutions yielded. Depending on the preference of criteria adopted in lexicographic optimisation, the location of the windows on the building façade tends to change. The bi-objective analysis indicates the importance of balancing out the daylight factor against each of privacy, solar heat gain and installation cost criteria. Furthermore, an analysis conducted in three major cities in the MENA region highlights the discrepancy in design alternatives generated depending on the local climatic condition. Originality/value This work proposes a novel mathematical optimisation model which focuses on producing a sustainable design and layout for windows on the facades of residential dwellings located in the MENA region. The proposed model provides designers with guidance through an automated support tool that yields optimised window designs and layout to ensure the sustainability of their designed buildings.

Sign in / Sign up

Export Citation Format

Share Document