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Building Energy Efficiency

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Building Energy Efficiency

  • Categories:Energy-saving
  • Time of issue:2019-06-20 00:00:00
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Building energy conservation and environment improvement are the ultimate goal of WinGreen.
 
The annual World Climate Conference serves as a regular reminder for the construction industry of its compelling obligation for environment. Energy use and carbon emissions have always been the key words on CAS-TWAS-WMO Forum. As we know, the climatic and ecological changes are closely related to the whole process of energy use, and the consumption of resources and energy in construction industry can be regarded as a whole process of energy use, too, the entire process of building energy consumption, from building material manufacturing, construction, to its use.
 
According to statistics, in the use of buildings, the loss of unused energy through the building itself accounts for 50% of total household energy, which mainly refers to the energy loss incurred by the building envelope and structure. The occurrence of this energy loss depend upon divers factors, involving the environment around the building, the design, the selection and quality of building materials, the energy efficiency performance of building materials, the installation method, energy recovery measures, etc.
 
Building energy efficiency is a long-term and systematic project, both in China and around the world. It is necessary to be enacted by the state to make comprehensive and specific laws and policies on building energy efficiency, and relevant government departments shall set comprehensive standards accordingly. Meanwhile a series of energy-saving measures should be taken in strict accordance with the national energy-saving policies and standards by developers as well as supervision and management departments at all levels during the whole process of design and construction of the building. Moreover, energy-saving materials and products which comply with or exceed the standards should be researched and produced in order to be applied in the construction projects. Only in this way can building energy efficiency be truly implemented and every citizen foster a sense of energy conservation.
 
As a part of the huge chain of building energy efficiency, WinGreen with manufacturers of various building materials together will continuously launch energy-saving products which comply with the energy-saving policies to support and promote energy saving in terms of material supply.
 
It is mainly by improving thermal insulation performance that building envelope materials can become energy saving. In the case that the whole building like a solid and tight shield keeps the air condition indoors comfortable, including temperature, humidity, etc., the use of energy can be reduced and ultimately saved. The most important indicator for measuring the energy efficiency performance of building materials is its thermal insulation performance, which is quantified as “thermal conductivity”, K-value for short (U-value in Europe). In general, at a certain temperature, the smaller the K-value is, the less heat is transferred through the material, which means that the thermal insulation performance of the material is better.
 
Coefficient of thermal conductivity of common solid building materials

 

Solid Material/Substance

Temperature-℃

λW/m·K

aluminium

300

230

copper

100

377

wrought iron

18

61

foundry iron

53

48

(1%C)steel

18

45

stainless steel

20

16

black lead

0

151

asbestos slate

50

0.17

asbestos

0~100

0.15

concrete

0~100

1.28

refractory brick

 

1.04

insulating brick

0~100

0.12~0.21

building brick

20

0.69

glass

30

1.09

cork wood

30

0.043

TDD(rock wool)insulation integrated Board

70

0.040

TDD(XPS)

25

0.028

TDD(Vacuum insulation)

25

0.006

TDD

25

0.006

ABS

--

0.25

 

As to materials with different functions in a building, ways to decrease the thermal conductivity and improve energy efficiency are diverse. For walls, provided the strength conditions are met, thermal insulation materials like rock wool can be added to reduce the thermal conductivity of the whole wall from inside to outside (or from outside to inside), but under this circumstance, the wall could be very thick. Other ways like using new materials to build the wall fail to be widely adopted in conventional civil construction, due to insufficient strength or high cost. In Danish codes for low-energy class 2020, there are specific requirements for the thickness of thermal insulation layer: wall ≥ 400mm, roof ≥ 500mm, and ground ≥ 400mm.
 
What’s more, it is required that the energy consumption should be no more than 20 kwh/m2 a year in Denmark, regardless of the size of housing. Residential energy transmission losses (through the building envelope and structure) are limited to 5-7.5%, which is comparable to the requirements for low energy class 2015.

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