| Glasses are essential things in peoples’ life. It will waste resources and pollute environment when the consumed waste glasses are not recycled and dealt with efficient. Facing with the situation of scarce resources and low recovery rate of glasses in our country, the production line of recycling and dealing with waste glasses was input from one company in Japan. The project can transfer waste glasses into environmental regenerated pumices, which are used in fields like gardening, virescence, water purification, building fire protection and ground treatment, etc. The regenerated waste glass pumice is a material with the characteristics of light weight, permeability, water retention, ventilation, thermal protection and insulation, fire retardant, etc. They were made into retaining wall blocks, prefabricated wall panels and other members and used in the envelop system of residential building built in the hot summer and cold winter zone as Wuhan. Through this way, the applicability of the regenerated waste glass pumice materials being used in wall heat insulation system was studied.The shortage of energy promotes energy-saving in every fields. Building energy saving is an important part of them. At the present stage, the new buildings are supposed to advance to the standard of65%of energy-saving in hot summer and cold winter zone in our country. It is necessary in controlling building energy consumption. The energy consumption of heat bridges is up to almost20%of the whole consumption in buildings. Then it’s significant meaningful in pushing on the development of building energy-saving to research energy consumption of thermal bridges in wall heat insulation systems.This paper is based on retaining wall blocks and prefabricated lightweight insulation wall panels and other members made from the new regenerated waste glass pumice materials. In wall heat insulation system, the concrete frame column thermal bridge is chosen to be studied. The temperature field and heat flow field of column thermal bridge are numerically simulated by ANSYS to offer scientific evaluation of the application in wall heat insulation system of regenerated waste glass pumice materials. The main contents of this paper are in follows. (1) The retaining wall blocks and prefabricated lightweight insulation wall panels made from regenerated waste glass pumice materials are respectively used in non-insulation, self-insulation, internal insulation and external insulation of the wall heat insulation system. It’s based on the theory of two-dimensional steady state heat transfer. The temperature field and heat flow field of column thermal bridge in different wall insulation system are numerically simulated by ANSYS. Through comparing the temperature of the inner surface and heat flows of column thermal bridge, the property of heat preservation of the new regenerated waste glass pumice is mastered. The results show that the inner surface temperature increases obviously and the area of influence by column thermal bridge decreases when using thermal insulation members made by the regenerated waste glass pumice materials in wall heat insulation system. Meanwhile, external insulation is better than self-insulation and internal insulation in preventing the loss of heat flow.(2) It still takes the concrete frame column thermal bridge of four heat insulation forms for example. It’s based on the theory of two dimensional unsteady heat transfer. The meteorological data of typical day in winter in Wuhan area is chosen. Through simulating heat transferring of thermal bridge in different wall insulation forms and different thickness of insulation layer and so on by ANSYS, the inner surface temperature-time curves are compared in different situations. The results show that the fluctuation of the wall surface temperature inside is little in self-insulation and external insulation system when under the action of the same air temperature wave. It can make the living environment more comfortable. Besides, the change of the insulation layer thickness improved little on the property of heat preservation in internal insulation, but it does better in external insulation.(3) It takes the external insulation for example. The other structural layers stay the same and the thickness of the insulation layer changes at internal of10mm, which is from Omm to90mm. The economical and reasonable thickness of insulation layer is determined through studying of the temperature field and heat flow field of different thickness of insulation layer. Besides, the energy consumption of column thermal bridge of different cross-sectional sizes and shapes is compared. The results show that economical insulation board thickness got from numerical analysis meets the demand of the domestic building energy-saving standard when using the environmental regenerated pumice materials in external insulation system. Besides, the change of the cross-sectional thickness of column thermal bridge has an influence on the heat transfer, and the change of the cross-sectional width and shape of column thermal bridge makes a little influence on the heat transfer.Through the above numerical simulation analysis, the applicability of the new regenerated waste glass pumices used in wall heat insulation system of buildings in hot summer and cold winter zone is scientifically evaluated, which is able to provide theoretical basis and calculation basis for the further researching, production, popularization and application in building energy-saving field of different structural members made by the new regenerated waste glass pumice materials. |
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