Effect of installing a venetian blind to a glass window on human thermal comfort

Khamporn, Nopparat; Chaiyapinunt, Somsak

doi:10.1016/j.buildenv.2014.10.022

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…Solar heat gain is the major and most variable cause of cooling energy demand. Solar heat gain and daylight also affect occupant thermal and visual comfort, well-being, and productivity [3,4]. Shades and blinds are a cost-effective means to reduce energy loss due to windows and provide a comfortable environment in the building, and they are easy to install [5].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Analysis of Energy and Daylighting Impact of Window Shading Systems and Control Strategies on Commercial Buildings in the United States

Kunwar

Bhandari

2020

Energies

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Commercial buildings consume approximately 1.9 EJ of energy in the United States, 50% of which is for heating, cooling, and lighting applications. It is estimated that windows contribute up to 34% of the energy used for heating and cooling. However, window retrofits are not often undertaken to increase energy efficiency because of the high cost and disruptive nature of window installation. Highly efficient window technologies would also need shading devices for glare prevention and visual comfort. An automated window shading system with an appropriate control strategy is a technology that can reduce energy demand, maintain occupant comfort, and enhance the aesthetics and privacy of the built environment. However, the benefits of the automated shades currently used by the shading industry are not well studied. The topic merits an analysis that will help building owners, designers and engineers, and utilities make informed decisions using knowledge of the impact of this technology on energy consumption, peak demand, daylighting, and occupant comfort. This study uses integrated daylight and whole-building energy simulation to evaluate the performance of various control strategies that the shading industry uses in commercial office buildings. The analysis was performed for three different vintages of medium office buildings at six different locations in United States. The results obtained show the control strategies enabled cooling energy savings of up to 40% using exterior shading, and lighting energy savings of up to 25%. The control strategies described can help building engineers and researchers explore different control methods used to control shading in actual buildings but rarely discussed in the literature. This information will give researchers the opportunity to investigate potential improvements in current technologies and their performance.

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Section: Introductionmentioning

confidence: 99%

A Comprehensive Analysis of Energy and Daylighting Impact of Window Shading Systems and Control Strategies on Commercial Buildings in the United States

Kunwar

Bhandari

2020

Energies

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“…Paper [5] presents an analysis of the influence of a curved Venetian blind situated in a window of a building located in a tropical climate. The authors compared experimental and theoretical studies.…”

Section: Introductionmentioning

confidence: 99%

Thermal functioning of a transparent barrier equipped with a system of external thermal insulation shields

Miąsik

Krasoń

2018

E3S Web Conf.

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The article presents the results of tests of the thermal operation of a transparent barrier, which is equipped with an external thermal insulation roller blind. The tests were carried out under real climatic conditions. The barrier in question was mounted on the south façade in two external test chambers. The aim of the research was to determine whether and to what extent the external thermal insulation roller blind influences the flow of heat through the transparent barrier. The second goal was to propose a way of programming the position of the blind so that it would be beneficial in both limiting of overheating in the adjacent room during the high summer sunshine and minimizing the need to reheat the room in the case of high clouds and low temperatures in the outside air. During the tests, the following values were measured: the intensity of solar radiation, temperature (outside air, indoor air and the internal surface of the barrier), as well as the heat flux density on the internal surface of the barrier. The test results indicate that the use of an external thermal insulation roller blind has a significant impact on the thermal operation of the transparent barrier and thermal comfort in the room adjacent to the barrier. The method of programming of the position of the blind should take into account both the temperature of the outside air and the value of the intensity of solar radiation, as well as the temperature of the air in the room adjacent to the barrier, and the direction and values of the heat flux passing through this barrier.

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“…Further, high energy consumption is related to the poor insulation of building skins, especially that of windows. Various studies have been conducted to investigate potential approaches for improving the thermal performance of windows, including the use of double skins [6][7][8][9][10][11][12][13][14][15], phase change materials (PCM) [16][17][18][19][20][21][22], window blinds [23][24][25][26][27][28][29][30][31][32], awnings [33][34][35], and light shelves [36][37][38][39][40][41]. Although several of these apparatuses may be efficiently used to reduce the energy consumption of the buildings, they often have high installation costs or are difficult to be 2 of 14 applied to the existing buildings.…”

Section: Introductionmentioning

confidence: 99%

Development of Window-Mounted Air Cap Roller Module

Lee

Seo

2018

Energies

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While previous research has shown the use of attachable air-caps on windows to efficiently reduce a building’s energy consumption, the air-caps considered had to be attached to the entire window’s surface, thus limiting the occupants’ view and creating the inconvenience of needing to detach and attach the air-caps. In this study, a window-mounted air-cap roller module using Velcro tape that may be easily attached, detached, and rolled up or down was developed and performance tested in a full-scale test bed. It was found that as the area of the air-caps attached on a window increased, the required indoor lighting energy increased. However, the window insulation improved, thus reducing the cooling and heating energy needed. Attaching the air-caps to the entire window surface effectively reduced the building’s energy consumption, but views through the window may be disturbed. Thus, the developed window-mounted air-caps enable an occupant to reduce the building energy consumption and maintain their view according to their need. The findings of this study may contribute to a reduction in building energy consumption without sacrificing a pleasant indoor environment. Further studies may be needed to verify their efficacy under varying indoor and outdoor conditions.

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Effect of installing a venetian blind to a glass window on human thermal comfort

Cited by 19 publications

References 17 publications

A Comprehensive Analysis of Energy and Daylighting Impact of Window Shading Systems and Control Strategies on Commercial Buildings in the United States

A Comprehensive Analysis of Energy and Daylighting Impact of Window Shading Systems and Control Strategies on Commercial Buildings in the United States

Thermal functioning of a transparent barrier equipped with a system of external thermal insulation shields

Development of Window-Mounted Air Cap Roller Module

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