基于“三重气候”解析的围护结构节能率计算模型

Energy Saving Rate Calculation Model of Envelope Structure Based on “Triple Climate” Analysis

围护结构的热工性能在建筑节能中起到重要作用,但需量化其影响程度。以确立围护结构在建筑节能中的贡献为目标,基于室内外及人体舒适气候建立了“三重气候”的围护结构节能贡献率计算模型,并基于此模型研究了室外气候条件、围护结构保温和蓄热性能等对围护结构节能贡献率的影响。结果表明:围护结构节能贡献率指标在不同室外气候条件下有明显差异且与采暖度日数(HDD18)呈正相关关系;通过设置外保温(90 mm)可使标准围护结构节能贡献率提高15%左右;提升墙体蓄热性能可以提高围护结构节能贡献率,且夏季墙体蓄热性能对围护结构节能贡献率提升较冬季更为显著。为严寒和寒冷地区气候条件下居住建筑节能优化设计提供参考。

The thermal performance of the envelope plays an important role in building energy efficiency, but the degree of its influence needs to be quantified. A “triple climate” model is established for calculating the energy efficiency of envelope structures based on indoor and outdoor conditions and human comfort climate, and studied the influence of outdoor climate conditions, insulation and thermal storage performance of envelope structures on the energy efficiency contribution of envelope structures. The results show that the energy saving contribution rate of the envelope differs significantly under different outdoor climatic conditions and is positively correlated with the number of heating degree days(HDD18);the energy saving contribution rate of the standard envelope can be increased by about 15% by installing external insulation(90 mm);the energy saving contribution rate of the envelope can be increased by improving the thermal storage performance of the wall, and the thermal storage performance of the wall improves the energy saving contribution rate of the envelope more significantly in summer than in winter. The improvement of wall thermal storage performance can improve the energy saving contribution of enclosure structure. This study can provide reference for the optimization design of building energy conservation under different climatic conditions.