A New Method for Energy Efficiency Design of Building Facade and Its Thermodynamic Evaluation

Abstract

Needless to say, green buildings have now become an inevitable trend for the sustainable development of society, and they have paved a way for the harmonious coexistence between man and nature. The design of building facade is an important part in green building construction, to achieve the optimal energy-saving effect of building facade, scholars in the field have attached great importance to this aspect and they have done works to optimize it from constituent materials, structural forms, and thermal insulation properties, etc. For the same purpose, this paper proposed a new method for the energy efficiency design of building facade and a thermodynamic evaluation method. First, the paper analyzed the factors that can affect the energy efficiency design of the wall, windows and roof of building facade; then it gave the calculation methods of parameters that are related to the energy-saving performance of building facade such as the coefficient of building shape (CBS), resistance of heat transfer, and thermal inertia (TI); after that, the paper summarized tips for the energy efficiency design of building facade, put forward a thermodynamic evaluation method for assessing the energy-saving efficiency and economic efficiency of green building facade based on the life cycle theory, and it elaborated the calculation process of energy consumption, exergy consumption and total cost of each stage in the life cycle of the building facade; at last, the paper verified the effectiveness of the new design method and the proposed evaluation method with experimental results, and the research findings of this paper can be applied to the design and evaluation of other buildings.

Technical Suitability of Energy Saving Scheme for Optimizing the Thermal Insulation Layer Thickness of Residential Building Exterior Wall

“…The thickness of insulation material determined by calculating the annual operating cost containing annual depreciation and energy loss is called the "economical thickness", and it is the minimum value of annual operating cost. In terms of the economical thickness of exterior wall insulation layer, world field scholars drew on the theory of life cycle evaluation to build economics models of insulation layer thickness for different types of buildings under different climatic conditions, they conducted research from different design angels and proposed methods for determining the economical thickness of insulation layer [14][15][16][17][18][19][20][21][22][23][24][25], and it's found that the regional climate features, building type, operating mode, and the differences in economic and technical levels can all affect the requirements of thermal insulation and energy conservation [26][27][28][29][30][31][32][33][34][35][36][37].…”