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Research Achievements

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Titel Multi-functional Super Window System with Solar Heat Gain Control
Manage Buillding and Urban Research Instiute Date 2017.06.05 Hit 1,474

 


Multi-functional Super Window System with Solar Heat Gain Control

 

Project Leader: Cho, Dong-Woo (Senior Research Fellow, dwcho@kict.re.kr)

 

 

■ Overview

With the increasing development of ultra high-rise offices and mixed office/residential buildings in recent times, domestic and overseas demand for curtain wall windows is sharply rising. Curtain wall buildings, made of glass and metal, are thermally vulnerable, making it difficult for them to satisfy insulation standards using conventional methods. Due to the overheating of indoor spaces by sunlight during summer, they consume large amounts of energy for air conditioning. KCTI has developed a multi-functional super window system that not only saves space heating energy in winter through high insulation performance and airtightness, but also saves on air-conditioning energy through solar control in summer.


This cost-effective window system allows for substantial savings in air-conditioning energy, which will help to achieve government policy objectives as well as contribute to creating new green construction markets.

 

 

▲ Schematic of the SuperWin-N ▲ Schematic of the NoBL system
▲ Schematic of the SuperWin-N ▲Schematic of the NoBL system

 

 

■ Background and necessity of the study

Buildings consume approximately 21% of Korea’s total energy use, of which approximately 30 - 40% is used for energy consumption relating to windows. Therefore windows can be said to be a key factor behind national greenhouse gas emissions.  Reduction of air-conditioning load for curtain walls, windows, and other building envelope systems through the sun-shielding standards in the Green Building Construction Act of May 2015, the implementation of a window energy efficiency ratings system, and implementation of zero-energy building certification systems has become urgently needed core technologies. The highest-performing domestically developed window systems have a thermal transmittance of 0.7W/㎡K, and SHGC of 0.2. However, the market for such high-performance windows is growing too slowly due to their extremely high unit price of supply. Accordingly, it is necessary to increase the supply of green buildings and zero-energy buildings through the development of windows that provide space heating and air-conditioning energy savings at average-range prices.

 

■ Research details

The technology at hand involves the development of 4 models, including ultra-slim curtain wall window systems with integrated blinds (SuperWin-N and SuperWin-R) and window systems (Nobl-1 and Nobl-2) that lower the SHGC value of glass without awnings.


●  Development of technology for ultra-slim blind-integrated curtain wall window system (SuperWin-N)
●  Development of technology for blind-integrated retrofit curtain wall window system (SuperWin-R)
●  Development of technology for window system (NoBL-1) that reduces glass SHGC without awnings
●  Development of technology for window system (NoBL-2) that reduces glass SHGC without awnings
● Application of developed technologies in the field, and pilot projects

 

▲Publicity in the Korea booth at COP 21 Paris
▲Publicity in the Korea booth at COP 21 Paris ▲Publicity in the Korea booth at COP 21 Paris
▲Publicity in the Korea booth at COP 21 Paris

 

 

■ Research achievements

The world market for building exterior materials is worth almost 50 trillion won per year. The domestic market for windows is worth around 10 trillion won per year, and it is growing due to the government’s recent bolstering of greenhouse gas emission reduction and energy savings policies. The aim of the present study is to reduce 25% of greenhouse gas emissions from buildings to achieve the government policy objectives and create new green building markets. To this end, we are seeking to apply developed technologies in the field and commercialize these technologies through technology transfer. Foundations are being laid to develop the domestic market as well as make inroads into overseas markets.
 
● 2 contracts signed (240 million won in royalties) for blind-integrated retrofit window system and awning-free glass SHGC-lowering window system technology transfer
● Field application (KCTI Innovation Center, 396 officetel units in Mapo-gu, 300+ mixed commercial/residential building units, 5 apartment units in Hanoi, etc.)
● Blind-integrated retrofit window system selected among 15 core technologies for development of markets in developing economies by Ministry of Science, ICT, and Future Planning
● 5 domestic patents, 2 PCT patents, 2 overseas patents, etc.
● 50 press publicity articles
● Promotion of developed technologies at overseas exhibitions on at least 5 occasions, including a seminar in the Korea booth at COP 21 held in Paris in 2015 and the issue of case studies
 

 

▲ Application of the developed technology in the field ▲ Application of the developed technology in the field ▲ Application of the developed technology in the field 
▲ Application of the developed technology in the field

 

■ Expected benefits

The system at hand is a practical system that adopts the concept of a window-type ultra-slim double skin envelope that minimizes increases in cost, achieves energy savings, and can actually be applied in the field. Instead of employing a conventional curtain wall structure, the system capitalizes on the functionality of a double skin envelope to improve insulation performance in the winter, block sunlight in the summer using awnings, and provide ventilation through openings in transitional seasons. This allows for substantial savings in air-conditioning and space heating energy. Optimized design of design parts and spandrel parts mean substantial reductions in construction costs compared to conventional double skin envelope structures. Economy is on par with that of conventional curtain wall buildings.


Future research will expand the applications of the technology to cover not only non-residential business and public buildings, but also mixed residential and commercial buildings and officetels. These efforts will improve Korean companies’ ability to respond to overseas technologies, and develop overseas climate technology markets in developing economies.

 

 

 

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