Dynamic Glass
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Dynamic Glass Energy benefits of View Dynamic Glass in workplaces Energy consumption by buildings The building sector in the U.S. and much of Europe accounts for approximately 40 percent of energy consumption and more than 70 percent of electricity use1, about half of that coming from commercial buildings. For rapidly developing areas of the world, their impact is currently less severe, but increasing. In India, commercial buildings currently account for 8 percent of total energy consumption, and their use is growing about 12 percent annually2. China’s buildings already consume more than 30 percent of the country’s energy and with China accounting for 50 percent of new buildings globally through 2020, energy consumption will increase dramatically3. with occupant schedules, lighting levels, or algorithms to increase building energy efficiency. Unfortunately, both LC and SPD require continuous high voltage AC to operate and their failure mode is dark. EC technology has the advantage of using low voltage, low energy consumption and a failure mode being clear. In addition EC is the only technology that has passed the rigorous ASTM standard for accelerated environmental durability4 which is equivalent to >50yr lifetime5 . The application of EC technology to windows can substantially reduce the energy consumption of buildings by reducing cooling and heating loads as well as the demand for electric lighting. Windows are commonly regarded as one of the least energy efficient building components, responsible for up to 40 percent of the total heating, cooling and lighting consumption. View Dynamic Glass improves the performance of the building by making windows energy efficient. Smart Windows and View Dynamic Glass Clear State Smart Windows are a category of next generation windows that have the ability to change traditionally static performance characteristics such as visible light transmittance and solar heat gain coefficient. Examples of technologies that enable Smart Windows are electrochromic (EC), thermochromic, photochromic, liquid crystal (LC) and suspended particle devices (SPD). Thermochromic and photochromic technologies change their properties based on ambient temperature and light respectively. EC, LC and SPD technologies have the advantage of electronic control of glass performance, enabling truly intelligent controls that can be integrated Tint State U.S. Department of Energy, “Energy Efficiency Trends in Residential and Commercial Buildings,” 2008. 2 S. Bhattacharya, M. Cropper, Rff DP 10–20, “Options for Energy Efficiency in India and Barriers to Their Adoption,” 2010. 3 Renewable Energy and Energy Efficient Partnership, “Worldwatch Report 182,”2010. 1 ASTM Test Standard E2141–06 “standard Test Method for Assessing Durabiltiy of Absorptive Electrochromic Coatings on Sealed Insulating Glass Units”. Testing conditions: 1 Sun (1000W/m2) at 85C; >50,000 cycles. 5 Assuming swithing three times a day between highest and lowest trans

Dynamic Glass View Dynamic Glass uses EC technology to change solar transmission properties (in the ultra–violet, visible and infrared spectrum) in response to a small applied voltage (< 5 volts). This enables control of the amount of light and radiative heat passing through a window that results in a window that ranging from a tinted transparent state to a clear transparent state. In addition, the coating has low emissivity properties, adding to the thermal performance when combined into a dual pane insulting glass unit (IGU). View Dynamic Glass is beneficial to all types of buildings as a...

Dynamic Glass Energy benefits of View Dynamic Glass in workplaces View Dynamic Glass can save an average 10 percent total building energy as seen in Chart 1. Peak Load A typical 20-story high-rise office building with high performance Low-E glass was modeled against a building with View Dynamic Glass. The window to wall ratio modeled was 50% which is typical for high rise buildings. With all other aspects constant, the difference in energy performance was a direct result of the performance of the glass. Input parameters are summarized in Appendix B. Annual energy consumption On average, use...

Dynamic Glass Energy benefits of View Dynamic Glass in workplaces Reducing peak loads has two significant impacts on the design and operation of the building: a. Peak load reduction can reduce HVAC system size (reduced cooling tons, fan, shaft & duct size, chiller, terminal units, diffusers, pumps and water circulation) required to meet loads in the building. Beyond the opportunity of straightforward equipment cost reductions, the reduced peak cooling loads offer a chance to use alternate cooling systems. Options such as radiant chilled ceilings and displacement ventilation can further...

Dynamic Glass Energy benefits of View Dynamic Glass in workplaces Similar to Case Study 1, a typical 4-story low-rise office building with high performance Low-E glass was modeled against a building with View Dynamic Glass. In the base case, the building using high performance Low-E glass contained a shading overhang on the southern facade. The window to wall ratio modeled was 40 percent which is typical for low rise buildings. In the View Dynamic Glass cases the shading overhang was eliminated. Input parameters are summarized in Appendix B. Annual energy consumption On average, use of View...

Dynamic Glass Energy benefits of View Dynamic Glass in workplaces This reduction in peak cooling load results in lower cooling tons and airflow cfm required as seen in Tables 5 & 6. As explained in Case Study 1, this results in significant savings in HVAC system size reduction. Table 6: Supply airflow (CFM) comparison Additionally, peak load reduction in a low-rise building acts in the same way as in a high-rise building. It leads to the reduction and possibly elimination of peak demand utility charges.

Dynamic Glass Energy benefits of View Dynamic Glass in workplaces The value of View Dynamic Glass extends beyond energy efficiency: 1. Greater architectural design freedom: Higher efficiency View Dynamic Glass enables designers to use more glass while still meeting the performance objectives of building energy codes and standards. 2. Increased occupant comfort and productivity: In addition to improved daylighting and thermal comfort, View Dynamic Glass allows occupants unobstructed views even in the tinted state. This benefit is enhanced by user control abilities. Studies6 have shown...