Electrochromic dynamic windows for office buildings

Sbar, Neil; Podbelski, Lou; Yang, Hilda; Pease, Bradley Justin

doi:10.1016/j.ijsbe.2012.09.001

Cited by 185 publications

(89 citation statements)

References 5 publications

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“…Typically, the required performance parameters include the specification of: (1) switching speed; (2) switching voltage; (3) optical reflectance; (4) color rendering; (5) solar heat gain coefficient; (6) optical memory coefficients; (7) thermal transmittance; (8) optical transmittance coefficients; (9) lifetime and (10) operating temperature [44,52]. The performance of the three types of smart glazing systems is summarized in Table 2 according to the climatic conditions while highlighting the main variables addressed in the studies.…”

Section: Smart Glazing Systemsmentioning

confidence: 99%

Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

2017

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Active shading systems in buildings have emerged as a high performing shading solution that selectively and optimally controls daylight and heat gains. Active shading systems are increasingly used in buildings, due to their ability to mainly improve the building environment, reduce energy consumption and in some cases generate energy. They may be categorized into three classes: smart glazing, kinetic shading and integrated renewable energy shading. This paper reviews the current status of the different types in terms of design principle and working mechanism of the systems, performance, control strategies and building applications. Challenges, limitations and future opportunities of the systems are then discussed. The review highlights that despite its high initial cost, the electrochromic (EC) glazing is the most applied smart glazing due to the extensive use of glass in buildings under all climatic conditions. In terms of external shadings, the rotating shading type is the predominantly used one in buildings due to its low initial cost. Algae façades and folding shading systems are still emerging types, with high initial and maintenance costs and requiring specialist installers. The algae façade systems and PV integrated shading systems are a promising solution due to their dual benefits of providing shading and generating electricity. Active shading systems were found to save 12 to 50% of the building cooling electricity consumption.

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Section: Smart Glazing Systemsmentioning

confidence: 99%

Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

2017

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“…This part of the window will work as a source of diffuse light to lit the nearest area to the window within 2 m depth [33]. Electrochromic (EC) window was chosen for this study because of its significant function of light transmission control [13,15,16]. The amount of diffuse light provided by electrochromic window is controlled parametrically [14] based on the amount of needed illumination, which was assigned between 300 and 500 lux and adapted by using the test points.…”

Section: Phasementioning

confidence: 99%

“…EC glass has the significant property to tune from transparent to translucent state instantly using the application of applied voltage, which can be controlled using movement sensors [15]. Therefore, EC glass in our study can be used as a source of amended diffuse light via controlling the penetration of solar radiation inside the building [16], which can then help to improve the performance of daylight inside the building. A study by A. Freewan investigated the combination of ceiling shapes and light shelves to enhance daylight distribution inside a deep room [17].…”

Section: Introductionmentioning

confidence: 95%

Using integrated parametric control to achieve better daylighting uniformity in an office room: A multi-Step comparison study

Eltaweel

2017

Energy and Buildings

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In addition to windows, louvers are the most common architectural elements widely used in office buildings to protect them from excessive daylight and improve daylight penetration as well. Advanced glazing, window blinds, other fenestration systems and their automation can further improve daylighting performance. However, the stability and uniformity of daylight distribution throughout a day inside a building remain a challenge. To explore a solution for this issue, this paper proposes an advanced integrated lighting system combining different architectural elements, which can be controlled parametrically. The suitable design of such integrated system is identified through a multi-step comparison study employing parametric design approach. The criteria is to keep a relatively uniform daylight distribution in the range of 300 -500 lux over 90% of the whole desktop area in a 7-meter-deep office room. An office building in New Cairo was chosen for a case study, where it is south oriented with a prevailing condition of clear sky. Hourly results on the 21 st of several chosen months are given to show the suitability of the proposed design throughout a year, aiming to explore the maximum use of daylight and hence reduce the energy consumption of electrical lighting. The comparison indicates that the combined use of the integrated system can achieve a satisfactory relatively uniform distribution of daylight over about 90% of the desktop area, within illuminance range of 300 -500 lux for most of the working hours throughout a year.

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“…Among recent publications, the paper by Jelle [1] reports a comprehensive comparison of thermo-optical performances of several smart windows technologies, as well as a deep reference section. The report by Lee et al [2] focuses on an experimental and numerical evaluation of the reduction of Heating, Ventilation and Air Conditioning (HVAC) power consumption given by the use of TC and EC smart windows in a test building, showing promising results in the case of EC windows, also studied by Sbar [3]. A previous study on the control strategy for active windows was carried out by Jonsson and Roos [4].…”

Section: Examples Are Electrocromic (Ec) Liquid Crystal Glasses (Lcdmentioning

confidence: 99%

Spectrophotometric evaluation of optical performances of polarizing technologies for smart window applications

Levati¹,

Vitali²,

Fustinoni³

et al. 2014

J. Phys.: Conf. Ser.

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Abstract. In recent years, window-integrated solar protection systems are used and studied as a promising energy saving technology, both for cold and hot climates. In particular, smart windows, whose optical proprieties in the solar wavelength range can somehow be controlled, show interesting results, especially in reducing the air conditioning power consumption. With the improvement of nanolithography techniques as well as with the possibility of designing polarization intervals, coupled polarizing films show a good potential as a dynamic and wavelength-selective shading technology. In this paper, UV-Vis-NIR spectrophotometric measurements are carried out on two polarizing technologies, Polaroid crystalline polarizer and Wire Grid broadband polarizer, in single-and double-film layout, to evaluate their optical performances, i.e. spectral transmittance, reflectance and absorptivity. The solar radiation glazing factors, according to the standard UNI EN 410, are calculated. The measured data are also analyzed in detail to emphasize the optical peculiarities of the materials under study that do not stand out from the standard parameters, as well as the specific problems that arise in spectrophotometric evaluations of polarizing films.

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Electrochromic dynamic windows for office buildings

Cited by 185 publications

References 5 publications

Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

Using integrated parametric control to achieve better daylighting uniformity in an office room: A multi-Step comparison study

Spectrophotometric evaluation of optical performances of polarizing technologies for smart window applications

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