Design and application of the hottest energy-savin

2022-09-30
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The design and application of energy-saving glass in modern building structures

glass structure is the weak link of building energy conservation. There is always an irreconcilable contradiction between the pursuit of modern appearance of buildings and effective energy conservation. Therefore, the use of large floor glass windows, bay windows, curtain walls and other glass structures is objectively limited

this paper focuses on the new generation of energy-saving glass in the construction field: thermal Mirror insulating glass, xir thermal reflection film laminated energy-saving glass These products provide support for architects to design and use large glass structures and even full glass structures

1 . Heat Mirror insulating glass

1 1 "hot mirror" hollow glass structure

this is a double hollow glass structure formed by hanging a low radiation plastic film between two glasses. It can adopt low radiation plastic films coated on one side and two sides, or films with different optical properties to meet different needs

although the double hollow structure can effectively improve the thermal insulation performance of the glass system, the thickness and weight of the glass components will be greatly increased, and a series of new requirements will be put forward for the building structure and load Considering the factors of cost and performance, double insulating glass will only be limited to applications with very stringent requirements for heat insulation Therefore, how to achieve better thermal insulation effect without significantly increasing weight and thickness has become a major challenge for architects and glass manufacturers The use of low radiation film can increase the number of thermal insulation layers without increasing the thickness and weight, making it possible to achieve the thermal insulation performance of ordinary insulating glass When using the three cavity structure (super hot mirror), the thickness of the hollow structure is only slightly higher than that of ordinary hollow glass, but it can achieve the highest thermal insulation effect of the actual glass system

1 . 2. Main technical indicators

● thermal insulation

thermal Mirror insulating glass (sc75), K value can reach 1 24; The K value of heat mirror Low-E insulating glass can reach 1 0 The K value of super thermal Mirror insulating glass (TC88) can reach 0 91 .

according to the test, under the irradiation of 250W infrared lamp, the back temperature of common insulating glass and thermal Mirror insulating glass of the same 24mm can reach 51 ℃ and 23 ℃ after 10 seconds; After 60 seconds, the former reaches 74 ℃, while the latter is only 25 ℃

● prevent condensation

take 4mm float glass + 8mm argon + hm88 thermal mirror film + 8mm argon + 4mmlow-e glass as an example. Under the conditions of room temperature 25 ℃, outdoor temperature -23 ℃ and humidity 70%, this structure can effectively prevent condensation The successful application in many swimming pool projects in Europe and America has proved that the use of hot mirror double hollow glass under the temperature difference of 40 ℃ can effectively prevent the condensation on the inner side of the window glass, maintain the architectural design style, and eliminate the radiative cooling near the window in winter

● sunlight control

thermal Mirror insulating glass products can use spectral selective reflection films with various visible light transmittance to meet different lighting and sun shading design requirements

● high transmittance

the transparency of Heat Mirror insulating glass is no different from that of ordinary insulating glass, and the visible light transmittance is 70%

● efficient UV shielding

can shield 99 5% harmful ultraviolet radiation

● efficient sound insulation

can be isolated 34 The noise is about 5 dB

● effectively save energy

according to the statistics of a McDonald's Restaurant using hot mirrors in Colorado, USA

premium of thermal mirror to ordinary insulating glass: $7093

reduce the capacity savings of air conditioning system: $5715

net cost of thermal Mirror insulating glass: $1298

annual energy saving amount estimation: $1748

the direct cost of installing thermal mirror can be recovered in 9 months

● advantages of thermal mirror for inclined daylighting roof glass

a) in vertically installed insulating glass, because the up and down motion path of gas molecules is much longer than the horizontal motion, the contribution of convective heat conduction perpendicular to the glass direction is small

b) when the insulating glass is tilted, the convective heat conduction perpendicular to the glass direction increases due to the shortening of the molecular motion path in the up-down direction

c) in the thermal mirror structure, because the thermal mirror film blocks the path of gas molecules moving up and down, the convective heat conduction perpendicular to the glass direction is significantly reduced

the thermal conductivity (k value) of ordinary insulating glass decreases by more than 30% from vertical to 27 degrees; The insulating glass of the hot mirror can only reduce the strength by 3%

● highly environmental protection

fully adapt to the global building environmental protection needs. Except for the intermediate coating that needs to be incinerated, other components can be recycled

1 . 3 scope of application:

all commercial and civil buildings such as building doors and windows, glass curtain walls, inclined lighting parts, such as swimming pools, indoor skating rinks, and buildings with high requirements for temperature control, dew prevention, energy conservation and environmental protection It can also be used in line cabinets, medical or commercial refrigeration equipment

2 . Xir heat reflective film laminated energy-saving glass

2 1 Structure introduction:

the low radiation plastic film of multilayer film system can be laminated between two pieces of glass to become a laminated glass product with both solar insulation and safety functions

xir laminated energy-saving glass is a new type of laminated energy-saving glass, which is formed by adding a transparent xir heat reflection film between two PVB sheets and then heat bonding with two sheets of glass

2 . 2 main technical indicators

laminated/coated glass - comprehensive performance comparison

● effectively reduce energy consumption

visible light transmittance is as high as 72%, visible light reflectivity is as low as 8%, at the same time, it reflects more than 90% of visible light thermal radiation, and the solar heat gain coefficient is only 0 41 or 0 47 .

☆ high efficiency screen industry discards cobalt and uses nickel to shield ultraviolet rays:

xir laminated glass can block up to 99 8% UV

☆ significant sound insulation:

based on the special sandwich structure of xir laminated glass, it can effectively reduce noise interference

☆ safety improvement:

the main connecting surface and exposed processing surface of the casting should not have sand holes, pores, shrinkage porosity

due to the special structure of xir laminated glass, it has higher impact resistance

xir laminated energy-saving glass scope of application:

it is widely used in large-scale energy conservation. We are considering the scope of this kind of technology to expand and optimize the external windows, lighting roofs, art galleries, libraries, museums, botanical gardens, corridors, recording studios, counters, windows and advanced window glass of buildings, especially for building glass components in banks, military, information and other departments with special needs

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